SWF / Client / poll_for_decision_task

poll_for_decision_task#

SWF.Client.poll_for_decision_task(**kwargs)#

Used by deciders to get a DecisionTask from the specified decision taskList. A decision task may be returned for any open workflow execution that is using the specified task list. The task includes a paginated view of the history of the workflow execution. The decider should use the workflow type and the history to determine how to properly handle the task.

This action initiates a long poll, where the service holds the HTTP connection open and responds as soon a task becomes available. If no decision task is available in the specified task list before the timeout of 60 seconds expires, an empty result is returned. An empty result, in this context, means that a DecisionTask is returned, but that the value of taskToken is an empty string.

Warning

Deciders should set their client side socket timeout to at least 70 seconds (10 seconds higher than the timeout).

Warning

Because the number of workflow history events for a single workflow execution might be very large, the result returned might be split up across a number of pages. To retrieve subsequent pages, make additional calls to PollForDecisionTask using the nextPageToken returned by the initial call. Note that you do not call GetWorkflowExecutionHistory with this nextPageToken. Instead, call PollForDecisionTask again.

Access Control

You can use IAM policies to control this action’s access to Amazon SWF resources as follows:

Use a Resource element with the domain name to limit the action to only specified domains.
Use an Action element to allow or deny permission to call this action.
Constrain the taskList.name parameter by using a Condition element with the swf:taskList.name key to allow the action to access only certain task lists.

If the caller doesn’t have sufficient permissions to invoke the action, or the parameter values fall outside the specified constraints, the action fails. The associated event attribute’s cause parameter is set to OPERATION_NOT_PERMITTED. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.

Request Syntax

response = client.poll_for_decision_task(
    domain='string',
    taskList={
        'name': 'string'
    },
    identity='string',
    nextPageToken='string',
    maximumPageSize=123,
    reverseOrder=True|False,
    startAtPreviousStartedEvent=True|False
)

Parameters:

domain (string) –
[REQUIRED]

The name of the domain containing the task lists to poll.
taskList (dict) –
[REQUIRED]

Specifies the task list to poll for decision tasks.

The specified string must not contain a : (colon), / (slash), | (vertical bar), or any control characters ( \u0000-\u001f | \u007f-\u009f). Also, it must not be the literal string arn.
- name (string) – [REQUIRED]
  
  The name of the task list.
identity (string) – Identity of the decider making the request, which is recorded in the DecisionTaskStarted event in the workflow history. This enables diagnostic tracing when problems arise. The form of this identity is user defined.
nextPageToken (string) –
If NextPageToken is returned there are more results available. The value of NextPageToken is a unique pagination token for each page. Make the call again using the returned token to retrieve the next page. Keep all other arguments unchanged. Each pagination token expires after 24 hours. Using an expired pagination token will return a 400 error: “ Specified token has exceeded its maximum lifetime”.

The configured maximumPageSize determines how many results can be returned in a single call.

Note
The nextPageToken returned by this action cannot be used with GetWorkflowExecutionHistory to get the next page. You must call PollForDecisionTask again (with the nextPageToken) to retrieve the next page of history records. Calling PollForDecisionTask with a nextPageToken doesn’t return a new decision task.
maximumPageSize (integer) –
The maximum number of results that are returned per call. Use nextPageToken to obtain further pages of results.

This is an upper limit only; the actual number of results returned per call may be fewer than the specified maximum.
reverseOrder (boolean) – When set to true, returns the events in reverse order. By default the results are returned in ascending order of the eventTimestamp of the events.
startAtPreviousStartedEvent (boolean) – When set to true, returns the events with eventTimestamp greater than or equal to eventTimestamp of the most recent DecisionTaskStarted event. By default, this parameter is set to false.

Return type:

dict

Returns:

Response Syntax

{
    'taskToken': 'string',
    'startedEventId': 123,
    'workflowExecution': {
        'workflowId': 'string',
        'runId': 'string'
    },
    'workflowType': {
        'name': 'string',
        'version': 'string'
    },
    'events': [
        {
            'eventTimestamp': datetime(2015, 1, 1),
            'eventType': 'WorkflowExecutionStarted'|'WorkflowExecutionCancelRequested'|'WorkflowExecutionCompleted'|'CompleteWorkflowExecutionFailed'|'WorkflowExecutionFailed'|'FailWorkflowExecutionFailed'|'WorkflowExecutionTimedOut'|'WorkflowExecutionCanceled'|'CancelWorkflowExecutionFailed'|'WorkflowExecutionContinuedAsNew'|'ContinueAsNewWorkflowExecutionFailed'|'WorkflowExecutionTerminated'|'DecisionTaskScheduled'|'DecisionTaskStarted'|'DecisionTaskCompleted'|'DecisionTaskTimedOut'|'ActivityTaskScheduled'|'ScheduleActivityTaskFailed'|'ActivityTaskStarted'|'ActivityTaskCompleted'|'ActivityTaskFailed'|'ActivityTaskTimedOut'|'ActivityTaskCanceled'|'ActivityTaskCancelRequested'|'RequestCancelActivityTaskFailed'|'WorkflowExecutionSignaled'|'MarkerRecorded'|'RecordMarkerFailed'|'TimerStarted'|'StartTimerFailed'|'TimerFired'|'TimerCanceled'|'CancelTimerFailed'|'StartChildWorkflowExecutionInitiated'|'StartChildWorkflowExecutionFailed'|'ChildWorkflowExecutionStarted'|'ChildWorkflowExecutionCompleted'|'ChildWorkflowExecutionFailed'|'ChildWorkflowExecutionTimedOut'|'ChildWorkflowExecutionCanceled'|'ChildWorkflowExecutionTerminated'|'SignalExternalWorkflowExecutionInitiated'|'SignalExternalWorkflowExecutionFailed'|'ExternalWorkflowExecutionSignaled'|'RequestCancelExternalWorkflowExecutionInitiated'|'RequestCancelExternalWorkflowExecutionFailed'|'ExternalWorkflowExecutionCancelRequested'|'LambdaFunctionScheduled'|'LambdaFunctionStarted'|'LambdaFunctionCompleted'|'LambdaFunctionFailed'|'LambdaFunctionTimedOut'|'ScheduleLambdaFunctionFailed'|'StartLambdaFunctionFailed',
            'eventId': 123,
            'workflowExecutionStartedEventAttributes': {
                'input': 'string',
                'executionStartToCloseTimeout': 'string',
                'taskStartToCloseTimeout': 'string',
                'childPolicy': 'TERMINATE'|'REQUEST_CANCEL'|'ABANDON',
                'taskList': {
                    'name': 'string'
                },
                'taskPriority': 'string',
                'workflowType': {
                    'name': 'string',
                    'version': 'string'
                },
                'tagList': [
                    'string',
                ],
                'continuedExecutionRunId': 'string',
                'parentWorkflowExecution': {
                    'workflowId': 'string',
                    'runId': 'string'
                },
                'parentInitiatedEventId': 123,
                'lambdaRole': 'string'
            },
            'workflowExecutionCompletedEventAttributes': {
                'result': 'string',
                'decisionTaskCompletedEventId': 123
            },
            'completeWorkflowExecutionFailedEventAttributes': {
                'cause': 'UNHANDLED_DECISION'|'OPERATION_NOT_PERMITTED',
                'decisionTaskCompletedEventId': 123
            },
            'workflowExecutionFailedEventAttributes': {
                'reason': 'string',
                'details': 'string',
                'decisionTaskCompletedEventId': 123
            },
            'failWorkflowExecutionFailedEventAttributes': {
                'cause': 'UNHANDLED_DECISION'|'OPERATION_NOT_PERMITTED',
                'decisionTaskCompletedEventId': 123
            },
            'workflowExecutionTimedOutEventAttributes': {
                'timeoutType': 'START_TO_CLOSE',
                'childPolicy': 'TERMINATE'|'REQUEST_CANCEL'|'ABANDON'
            },
            'workflowExecutionCanceledEventAttributes': {
                'details': 'string',
                'decisionTaskCompletedEventId': 123
            },
            'cancelWorkflowExecutionFailedEventAttributes': {
                'cause': 'UNHANDLED_DECISION'|'OPERATION_NOT_PERMITTED',
                'decisionTaskCompletedEventId': 123
            },
            'workflowExecutionContinuedAsNewEventAttributes': {
                'input': 'string',
                'decisionTaskCompletedEventId': 123,
                'newExecutionRunId': 'string',
                'executionStartToCloseTimeout': 'string',
                'taskList': {
                    'name': 'string'
                },
                'taskPriority': 'string',
                'taskStartToCloseTimeout': 'string',
                'childPolicy': 'TERMINATE'|'REQUEST_CANCEL'|'ABANDON',
                'tagList': [
                    'string',
                ],
                'workflowType': {
                    'name': 'string',
                    'version': 'string'
                },
                'lambdaRole': 'string'
            },
            'continueAsNewWorkflowExecutionFailedEventAttributes': {
                'cause': 'UNHANDLED_DECISION'|'WORKFLOW_TYPE_DEPRECATED'|'WORKFLOW_TYPE_DOES_NOT_EXIST'|'DEFAULT_EXECUTION_START_TO_CLOSE_TIMEOUT_UNDEFINED'|'DEFAULT_TASK_START_TO_CLOSE_TIMEOUT_UNDEFINED'|'DEFAULT_TASK_LIST_UNDEFINED'|'DEFAULT_CHILD_POLICY_UNDEFINED'|'CONTINUE_AS_NEW_WORKFLOW_EXECUTION_RATE_EXCEEDED'|'OPERATION_NOT_PERMITTED',
                'decisionTaskCompletedEventId': 123
            },
            'workflowExecutionTerminatedEventAttributes': {
                'reason': 'string',
                'details': 'string',
                'childPolicy': 'TERMINATE'|'REQUEST_CANCEL'|'ABANDON',
                'cause': 'CHILD_POLICY_APPLIED'|'EVENT_LIMIT_EXCEEDED'|'OPERATOR_INITIATED'
            },
            'workflowExecutionCancelRequestedEventAttributes': {
                'externalWorkflowExecution': {
                    'workflowId': 'string',
                    'runId': 'string'
                },
                'externalInitiatedEventId': 123,
                'cause': 'CHILD_POLICY_APPLIED'
            },
            'decisionTaskScheduledEventAttributes': {
                'taskList': {
                    'name': 'string'
                },
                'taskPriority': 'string',
                'startToCloseTimeout': 'string',
                'scheduleToStartTimeout': 'string'
            },
            'decisionTaskStartedEventAttributes': {
                'identity': 'string',
                'scheduledEventId': 123
            },
            'decisionTaskCompletedEventAttributes': {
                'executionContext': 'string',
                'scheduledEventId': 123,
                'startedEventId': 123,
                'taskList': {
                    'name': 'string'
                },
                'taskListScheduleToStartTimeout': 'string'
            },
            'decisionTaskTimedOutEventAttributes': {
                'timeoutType': 'START_TO_CLOSE'|'SCHEDULE_TO_START',
                'scheduledEventId': 123,
                'startedEventId': 123
            },
            'activityTaskScheduledEventAttributes': {
                'activityType': {
                    'name': 'string',
                    'version': 'string'
                },
                'activityId': 'string',
                'input': 'string',
                'control': 'string',
                'scheduleToStartTimeout': 'string',
                'scheduleToCloseTimeout': 'string',
                'startToCloseTimeout': 'string',
                'taskList': {
                    'name': 'string'
                },
                'taskPriority': 'string',
                'decisionTaskCompletedEventId': 123,
                'heartbeatTimeout': 'string'
            },
            'activityTaskStartedEventAttributes': {
                'identity': 'string',
                'scheduledEventId': 123
            },
            'activityTaskCompletedEventAttributes': {
                'result': 'string',
                'scheduledEventId': 123,
                'startedEventId': 123
            },
            'activityTaskFailedEventAttributes': {
                'reason': 'string',
                'details': 'string',
                'scheduledEventId': 123,
                'startedEventId': 123
            },
            'activityTaskTimedOutEventAttributes': {
                'timeoutType': 'START_TO_CLOSE'|'SCHEDULE_TO_START'|'SCHEDULE_TO_CLOSE'|'HEARTBEAT',
                'scheduledEventId': 123,
                'startedEventId': 123,
                'details': 'string'
            },
            'activityTaskCanceledEventAttributes': {
                'details': 'string',
                'scheduledEventId': 123,
                'startedEventId': 123,
                'latestCancelRequestedEventId': 123
            },
            'activityTaskCancelRequestedEventAttributes': {
                'decisionTaskCompletedEventId': 123,
                'activityId': 'string'
            },
            'workflowExecutionSignaledEventAttributes': {
                'signalName': 'string',
                'input': 'string',
                'externalWorkflowExecution': {
                    'workflowId': 'string',
                    'runId': 'string'
                },
                'externalInitiatedEventId': 123
            },
            'markerRecordedEventAttributes': {
                'markerName': 'string',
                'details': 'string',
                'decisionTaskCompletedEventId': 123
            },
            'recordMarkerFailedEventAttributes': {
                'markerName': 'string',
                'cause': 'OPERATION_NOT_PERMITTED',
                'decisionTaskCompletedEventId': 123
            },
            'timerStartedEventAttributes': {
                'timerId': 'string',
                'control': 'string',
                'startToFireTimeout': 'string',
                'decisionTaskCompletedEventId': 123
            },
            'timerFiredEventAttributes': {
                'timerId': 'string',
                'startedEventId': 123
            },
            'timerCanceledEventAttributes': {
                'timerId': 'string',
                'startedEventId': 123,
                'decisionTaskCompletedEventId': 123
            },
            'startChildWorkflowExecutionInitiatedEventAttributes': {
                'workflowId': 'string',
                'workflowType': {
                    'name': 'string',
                    'version': 'string'
                },
                'control': 'string',
                'input': 'string',
                'executionStartToCloseTimeout': 'string',
                'taskList': {
                    'name': 'string'
                },
                'taskPriority': 'string',
                'decisionTaskCompletedEventId': 123,
                'childPolicy': 'TERMINATE'|'REQUEST_CANCEL'|'ABANDON',
                'taskStartToCloseTimeout': 'string',
                'tagList': [
                    'string',
                ],
                'lambdaRole': 'string'
            },
            'childWorkflowExecutionStartedEventAttributes': {
                'workflowExecution': {
                    'workflowId': 'string',
                    'runId': 'string'
                },
                'workflowType': {
                    'name': 'string',
                    'version': 'string'
                },
                'initiatedEventId': 123
            },
            'childWorkflowExecutionCompletedEventAttributes': {
                'workflowExecution': {
                    'workflowId': 'string',
                    'runId': 'string'
                },
                'workflowType': {
                    'name': 'string',
                    'version': 'string'
                },
                'result': 'string',
                'initiatedEventId': 123,
                'startedEventId': 123
            },
            'childWorkflowExecutionFailedEventAttributes': {
                'workflowExecution': {
                    'workflowId': 'string',
                    'runId': 'string'
                },
                'workflowType': {
                    'name': 'string',
                    'version': 'string'
                },
                'reason': 'string',
                'details': 'string',
                'initiatedEventId': 123,
                'startedEventId': 123
            },
            'childWorkflowExecutionTimedOutEventAttributes': {
                'workflowExecution': {
                    'workflowId': 'string',
                    'runId': 'string'
                },
                'workflowType': {
                    'name': 'string',
                    'version': 'string'
                },
                'timeoutType': 'START_TO_CLOSE',
                'initiatedEventId': 123,
                'startedEventId': 123
            },
            'childWorkflowExecutionCanceledEventAttributes': {
                'workflowExecution': {
                    'workflowId': 'string',
                    'runId': 'string'
                },
                'workflowType': {
                    'name': 'string',
                    'version': 'string'
                },
                'details': 'string',
                'initiatedEventId': 123,
                'startedEventId': 123
            },
            'childWorkflowExecutionTerminatedEventAttributes': {
                'workflowExecution': {
                    'workflowId': 'string',
                    'runId': 'string'
                },
                'workflowType': {
                    'name': 'string',
                    'version': 'string'
                },
                'initiatedEventId': 123,
                'startedEventId': 123
            },
            'signalExternalWorkflowExecutionInitiatedEventAttributes': {
                'workflowId': 'string',
                'runId': 'string',
                'signalName': 'string',
                'input': 'string',
                'decisionTaskCompletedEventId': 123,
                'control': 'string'
            },
            'externalWorkflowExecutionSignaledEventAttributes': {
                'workflowExecution': {
                    'workflowId': 'string',
                    'runId': 'string'
                },
                'initiatedEventId': 123
            },
            'signalExternalWorkflowExecutionFailedEventAttributes': {
                'workflowId': 'string',
                'runId': 'string',
                'cause': 'UNKNOWN_EXTERNAL_WORKFLOW_EXECUTION'|'SIGNAL_EXTERNAL_WORKFLOW_EXECUTION_RATE_EXCEEDED'|'OPERATION_NOT_PERMITTED',
                'initiatedEventId': 123,
                'decisionTaskCompletedEventId': 123,
                'control': 'string'
            },
            'externalWorkflowExecutionCancelRequestedEventAttributes': {
                'workflowExecution': {
                    'workflowId': 'string',
                    'runId': 'string'
                },
                'initiatedEventId': 123
            },
            'requestCancelExternalWorkflowExecutionInitiatedEventAttributes': {
                'workflowId': 'string',
                'runId': 'string',
                'decisionTaskCompletedEventId': 123,
                'control': 'string'
            },
            'requestCancelExternalWorkflowExecutionFailedEventAttributes': {
                'workflowId': 'string',
                'runId': 'string',
                'cause': 'UNKNOWN_EXTERNAL_WORKFLOW_EXECUTION'|'REQUEST_CANCEL_EXTERNAL_WORKFLOW_EXECUTION_RATE_EXCEEDED'|'OPERATION_NOT_PERMITTED',
                'initiatedEventId': 123,
                'decisionTaskCompletedEventId': 123,
                'control': 'string'
            },
            'scheduleActivityTaskFailedEventAttributes': {
                'activityType': {
                    'name': 'string',
                    'version': 'string'
                },
                'activityId': 'string',
                'cause': 'ACTIVITY_TYPE_DEPRECATED'|'ACTIVITY_TYPE_DOES_NOT_EXIST'|'ACTIVITY_ID_ALREADY_IN_USE'|'OPEN_ACTIVITIES_LIMIT_EXCEEDED'|'ACTIVITY_CREATION_RATE_EXCEEDED'|'DEFAULT_SCHEDULE_TO_CLOSE_TIMEOUT_UNDEFINED'|'DEFAULT_TASK_LIST_UNDEFINED'|'DEFAULT_SCHEDULE_TO_START_TIMEOUT_UNDEFINED'|'DEFAULT_START_TO_CLOSE_TIMEOUT_UNDEFINED'|'DEFAULT_HEARTBEAT_TIMEOUT_UNDEFINED'|'OPERATION_NOT_PERMITTED',
                'decisionTaskCompletedEventId': 123
            },
            'requestCancelActivityTaskFailedEventAttributes': {
                'activityId': 'string',
                'cause': 'ACTIVITY_ID_UNKNOWN'|'OPERATION_NOT_PERMITTED',
                'decisionTaskCompletedEventId': 123
            },
            'startTimerFailedEventAttributes': {
                'timerId': 'string',
                'cause': 'TIMER_ID_ALREADY_IN_USE'|'OPEN_TIMERS_LIMIT_EXCEEDED'|'TIMER_CREATION_RATE_EXCEEDED'|'OPERATION_NOT_PERMITTED',
                'decisionTaskCompletedEventId': 123
            },
            'cancelTimerFailedEventAttributes': {
                'timerId': 'string',
                'cause': 'TIMER_ID_UNKNOWN'|'OPERATION_NOT_PERMITTED',
                'decisionTaskCompletedEventId': 123
            },
            'startChildWorkflowExecutionFailedEventAttributes': {
                'workflowType': {
                    'name': 'string',
                    'version': 'string'
                },
                'cause': 'WORKFLOW_TYPE_DOES_NOT_EXIST'|'WORKFLOW_TYPE_DEPRECATED'|'OPEN_CHILDREN_LIMIT_EXCEEDED'|'OPEN_WORKFLOWS_LIMIT_EXCEEDED'|'CHILD_CREATION_RATE_EXCEEDED'|'WORKFLOW_ALREADY_RUNNING'|'DEFAULT_EXECUTION_START_TO_CLOSE_TIMEOUT_UNDEFINED'|'DEFAULT_TASK_LIST_UNDEFINED'|'DEFAULT_TASK_START_TO_CLOSE_TIMEOUT_UNDEFINED'|'DEFAULT_CHILD_POLICY_UNDEFINED'|'OPERATION_NOT_PERMITTED',
                'workflowId': 'string',
                'initiatedEventId': 123,
                'decisionTaskCompletedEventId': 123,
                'control': 'string'
            },
            'lambdaFunctionScheduledEventAttributes': {
                'id': 'string',
                'name': 'string',
                'control': 'string',
                'input': 'string',
                'startToCloseTimeout': 'string',
                'decisionTaskCompletedEventId': 123
            },
            'lambdaFunctionStartedEventAttributes': {
                'scheduledEventId': 123
            },
            'lambdaFunctionCompletedEventAttributes': {
                'scheduledEventId': 123,
                'startedEventId': 123,
                'result': 'string'
            },
            'lambdaFunctionFailedEventAttributes': {
                'scheduledEventId': 123,
                'startedEventId': 123,
                'reason': 'string',
                'details': 'string'
            },
            'lambdaFunctionTimedOutEventAttributes': {
                'scheduledEventId': 123,
                'startedEventId': 123,
                'timeoutType': 'START_TO_CLOSE'
            },
            'scheduleLambdaFunctionFailedEventAttributes': {
                'id': 'string',
                'name': 'string',
                'cause': 'ID_ALREADY_IN_USE'|'OPEN_LAMBDA_FUNCTIONS_LIMIT_EXCEEDED'|'LAMBDA_FUNCTION_CREATION_RATE_EXCEEDED'|'LAMBDA_SERVICE_NOT_AVAILABLE_IN_REGION',
                'decisionTaskCompletedEventId': 123
            },
            'startLambdaFunctionFailedEventAttributes': {
                'scheduledEventId': 123,
                'cause': 'ASSUME_ROLE_FAILED',
                'message': 'string'
            }
        },
    ],
    'nextPageToken': 'string',
    'previousStartedEventId': 123
}

Response Structure

(dict) –

A structure that represents a decision task. Decision tasks are sent to deciders in order for them to make decisions.
- taskToken (string) –
  
  The opaque string used as a handle on the task. This token is used by workers to communicate progress and response information back to the system about the task.
- startedEventId (integer) –
  
  The ID of the DecisionTaskStarted event recorded in the history.
- workflowExecution (dict) –
  
  The workflow execution for which this decision task was created.
  - workflowId (string) –
    
    The user defined identifier associated with the workflow execution.
  - runId (string) –
    
    A system-generated unique identifier for the workflow execution.
- workflowType (dict) –
  
  The type of the workflow execution for which this decision task was created.
  - name (string) –
    
    The name of the workflow type.
    
    Note
    The combination of workflow type name and version must be unique with in a domain.
  - version (string) –
    
    The version of the workflow type.
    
    Note
    The combination of workflow type name and version must be unique with in a domain.
- events (list) –
  
  A paginated list of history events of the workflow execution. The decider uses this during the processing of the decision task.
  - (dict) –
    
    Event within a workflow execution. A history event can be one of these types:
    - ActivityTaskCancelRequested – A RequestCancelActivityTask decision was received by the system.
    - ActivityTaskCanceled – The activity task was successfully canceled.
    - ActivityTaskCompleted – An activity worker successfully completed an activity task by calling RespondActivityTaskCompleted.
    - ActivityTaskFailed – An activity worker failed an activity task by calling RespondActivityTaskFailed.
    - ActivityTaskScheduled – An activity task was scheduled for execution.
    - ActivityTaskStarted – The scheduled activity task was dispatched to a worker.
    - ActivityTaskTimedOut – The activity task timed out.
    - CancelTimerFailed – Failed to process CancelTimer decision. This happens when the decision isn’t configured properly, for example no timer exists with the specified timer Id.
    - CancelWorkflowExecutionFailed – A request to cancel a workflow execution failed.
    - ChildWorkflowExecutionCanceled – A child workflow execution, started by this workflow execution, was canceled and closed.
    - ChildWorkflowExecutionCompleted – A child workflow execution, started by this workflow execution, completed successfully and was closed.
    - ChildWorkflowExecutionFailed – A child workflow execution, started by this workflow execution, failed to complete successfully and was closed.
    - ChildWorkflowExecutionStarted – A child workflow execution was successfully started.
    - ChildWorkflowExecutionTerminated – A child workflow execution, started by this workflow execution, was terminated.
    - ChildWorkflowExecutionTimedOut – A child workflow execution, started by this workflow execution, timed out and was closed.
    - CompleteWorkflowExecutionFailed – The workflow execution failed to complete.
    - ContinueAsNewWorkflowExecutionFailed – The workflow execution failed to complete after being continued as a new workflow execution.
    - DecisionTaskCompleted – The decider successfully completed a decision task by calling RespondDecisionTaskCompleted.
    - DecisionTaskScheduled – A decision task was scheduled for the workflow execution.
    - DecisionTaskStarted – The decision task was dispatched to a decider.
    - DecisionTaskTimedOut – The decision task timed out.
    - ExternalWorkflowExecutionCancelRequested – Request to cancel an external workflow execution was successfully delivered to the target execution.
    - ExternalWorkflowExecutionSignaled – A signal, requested by this workflow execution, was successfully delivered to the target external workflow execution.
    - FailWorkflowExecutionFailed – A request to mark a workflow execution as failed, itself failed.
    - MarkerRecorded – A marker was recorded in the workflow history as the result of a RecordMarker decision.
    - RecordMarkerFailed – A RecordMarker decision was returned as failed.
    - RequestCancelActivityTaskFailed – Failed to process RequestCancelActivityTask decision. This happens when the decision isn’t configured properly.
    - RequestCancelExternalWorkflowExecutionFailed – Request to cancel an external workflow execution failed.
    - RequestCancelExternalWorkflowExecutionInitiated – A request was made to request the cancellation of an external workflow execution.
    - ScheduleActivityTaskFailed – Failed to process ScheduleActivityTask decision. This happens when the decision isn’t configured properly, for example the activity type specified isn’t registered.
    - SignalExternalWorkflowExecutionFailed – The request to signal an external workflow execution failed.
    - SignalExternalWorkflowExecutionInitiated – A request to signal an external workflow was made.
    - StartActivityTaskFailed – A scheduled activity task failed to start.
    - StartChildWorkflowExecutionFailed – Failed to process StartChildWorkflowExecution decision. This happens when the decision isn’t configured properly, for example the workflow type specified isn’t registered.
    - StartChildWorkflowExecutionInitiated – A request was made to start a child workflow execution.
    - StartTimerFailed – Failed to process StartTimer decision. This happens when the decision isn’t configured properly, for example a timer already exists with the specified timer Id.
    - TimerCanceled – A timer, previously started for this workflow execution, was successfully canceled.
    - TimerFired – A timer, previously started for this workflow execution, fired.
    - TimerStarted – A timer was started for the workflow execution due to a StartTimer decision.
    - WorkflowExecutionCancelRequested – A request to cancel this workflow execution was made.
    - WorkflowExecutionCanceled – The workflow execution was successfully canceled and closed.
    - WorkflowExecutionCompleted – The workflow execution was closed due to successful completion.
    - WorkflowExecutionContinuedAsNew – The workflow execution was closed and a new execution of the same type was created with the same workflowId.
    - WorkflowExecutionFailed – The workflow execution closed due to a failure.
    - WorkflowExecutionSignaled – An external signal was received for the workflow execution.
    - WorkflowExecutionStarted – The workflow execution was started.
    - WorkflowExecutionTerminated – The workflow execution was terminated.
    - WorkflowExecutionTimedOut – The workflow execution was closed because a time out was exceeded.
    - eventTimestamp (datetime) –
      
      The date and time when the event occurred.
    - eventType (string) –
      
      The type of the history event.
    - eventId (integer) –
      
      The system generated ID of the event. This ID uniquely identifies the event with in the workflow execution history.
    - workflowExecutionStartedEventAttributes (dict) –
      
      If the event is of type WorkflowExecutionStarted then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - input (string) –
        
        The input provided to the workflow execution.
      - executionStartToCloseTimeout (string) –
        
        The maximum duration for this workflow execution.
        
        The duration is specified in seconds, an integer greater than or equal to 0. You can use NONE to specify unlimited duration.
      - taskStartToCloseTimeout (string) –
        
        The maximum duration of decision tasks for this workflow type.
        
        The duration is specified in seconds, an integer greater than or equal to 0. You can use NONE to specify unlimited duration.
      - childPolicy (string) –
        
        The policy to use for the child workflow executions if this workflow execution is terminated, by calling the TerminateWorkflowExecution action explicitly or due to an expired timeout.
        
        The supported child policies are:
        
        TERMINATE – The child executions are terminated.
        
        REQUEST_CANCEL – A request to cancel is attempted for each child execution by recording a WorkflowExecutionCancelRequested event in its history. It is up to the decider to take appropriate actions when it receives an execution history with this event.
        
        ABANDON – No action is taken. The child executions continue to run.
      - taskList (dict) –
        
        The name of the task list for scheduling the decision tasks for this workflow execution.
        
        name (string) –
        
        The name of the task list.
      - taskPriority (string) –
        
        The priority of the decision tasks in the workflow execution.
      - workflowType (dict) –
        
        The workflow type of this execution.
        
        name (string) –
        
        The name of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
        
        version (string) –
        
        The version of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
      - tagList (list) –
        
        The list of tags associated with this workflow execution. An execution can have up to 5 tags.
        
        (string) –
      - continuedExecutionRunId (string) –
        
        If this workflow execution was started due to a ContinueAsNewWorkflowExecution decision, then it contains the runId of the previous workflow execution that was closed and continued as this execution.
      - parentWorkflowExecution (dict) –
        
        The source workflow execution that started this workflow execution. The member isn’t set if the workflow execution was not started by a workflow.
        
        workflowId (string) –
        
        The user defined identifier associated with the workflow execution.
        
        runId (string) –
        
        A system-generated unique identifier for the workflow execution.
      - parentInitiatedEventId (integer) –
        
        The ID of the StartChildWorkflowExecutionInitiated event corresponding to the StartChildWorkflowExecution Decision to start this workflow execution. The source event with this ID can be found in the history of the source workflow execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - lambdaRole (string) –
        
        The IAM role attached to the workflow execution.
    - workflowExecutionCompletedEventAttributes (dict) –
      
      If the event is of type WorkflowExecutionCompleted then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - result (string) –
        
        The result produced by the workflow execution upon successful completion.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the CompleteWorkflowExecution decision to complete this execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - completeWorkflowExecutionFailedEventAttributes (dict) –
      
      If the event is of type CompleteWorkflowExecutionFailed then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - cause (string) –
        
        The cause of the failure. This information is generated by the system and can be useful for diagnostic purposes.
        
        Note
        If cause is set to OPERATION_NOT_PERMITTED, the decision failed because it lacked sufficient permissions. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the CompleteWorkflowExecution decision to complete this execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - workflowExecutionFailedEventAttributes (dict) –
      
      If the event is of type WorkflowExecutionFailed then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - reason (string) –
        
        The descriptive reason provided for the failure.
      - details (string) –
        
        The details of the failure.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the FailWorkflowExecution decision to fail this execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - failWorkflowExecutionFailedEventAttributes (dict) –
      
      If the event is of type FailWorkflowExecutionFailed then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - cause (string) –
        
        The cause of the failure. This information is generated by the system and can be useful for diagnostic purposes.
        
        Note
        If cause is set to OPERATION_NOT_PERMITTED, the decision failed because it lacked sufficient permissions. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the FailWorkflowExecution decision to fail this execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - workflowExecutionTimedOutEventAttributes (dict) –
      
      If the event is of type WorkflowExecutionTimedOut then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - timeoutType (string) –
        
        The type of timeout that caused this event.
      - childPolicy (string) –
        
        The policy used for the child workflow executions of this workflow execution.
        
        The supported child policies are:
        
        TERMINATE – The child executions are terminated.
        
        REQUEST_CANCEL – A request to cancel is attempted for each child execution by recording a WorkflowExecutionCancelRequested event in its history. It is up to the decider to take appropriate actions when it receives an execution history with this event.
        
        ABANDON – No action is taken. The child executions continue to run.
    - workflowExecutionCanceledEventAttributes (dict) –
      
      If the event is of type WorkflowExecutionCanceled then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - details (string) –
        
        The details of the cancellation.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the CancelWorkflowExecution decision for this cancellation request. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - cancelWorkflowExecutionFailedEventAttributes (dict) –
      
      If the event is of type CancelWorkflowExecutionFailed then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - cause (string) –
        
        The cause of the failure. This information is generated by the system and can be useful for diagnostic purposes.
        
        Note
        If cause is set to OPERATION_NOT_PERMITTED, the decision failed because it lacked sufficient permissions. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the CancelWorkflowExecution decision for this cancellation request. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - workflowExecutionContinuedAsNewEventAttributes (dict) –
      
      If the event is of type WorkflowExecutionContinuedAsNew then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - input (string) –
        
        The input provided to the new workflow execution.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the ContinueAsNewWorkflowExecution decision that started this execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - newExecutionRunId (string) –
        
        The runId of the new workflow execution.
      - executionStartToCloseTimeout (string) –
        
        The total duration allowed for the new workflow execution.
        
        The duration is specified in seconds, an integer greater than or equal to 0. You can use NONE to specify unlimited duration.
      - taskList (dict) –
        
        The task list to use for the decisions of the new (continued) workflow execution.
        
        name (string) –
        
        The name of the task list.
      - taskPriority (string) –
        
        The priority of the task to use for the decisions of the new (continued) workflow execution.
      - taskStartToCloseTimeout (string) –
        
        The maximum duration of decision tasks for the new workflow execution.
        
        The duration is specified in seconds, an integer greater than or equal to 0. You can use NONE to specify unlimited duration.
      - childPolicy (string) –
        
        The policy to use for the child workflow executions of the new execution if it is terminated by calling the TerminateWorkflowExecution action explicitly or due to an expired timeout.
        
        The supported child policies are:
        
        TERMINATE – The child executions are terminated.
        
        REQUEST_CANCEL – A request to cancel is attempted for each child execution by recording a WorkflowExecutionCancelRequested event in its history. It is up to the decider to take appropriate actions when it receives an execution history with this event.
        
        ABANDON – No action is taken. The child executions continue to run.
      - tagList (list) –
        
        The list of tags associated with the new workflow execution.
        
        (string) –
      - workflowType (dict) –
        
        The workflow type of this execution.
        
        name (string) –
        
        The name of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
        
        version (string) –
        
        The version of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
      - lambdaRole (string) –
        
        The IAM role to attach to the new (continued) workflow execution.
    - continueAsNewWorkflowExecutionFailedEventAttributes (dict) –
      
      If the event is of type ContinueAsNewWorkflowExecutionFailed then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - cause (string) –
        
        The cause of the failure. This information is generated by the system and can be useful for diagnostic purposes.
        
        Note
        If cause is set to OPERATION_NOT_PERMITTED, the decision failed because it lacked sufficient permissions. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the ContinueAsNewWorkflowExecution decision that started this execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - workflowExecutionTerminatedEventAttributes (dict) –
      
      If the event is of type WorkflowExecutionTerminated then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - reason (string) –
        
        The reason provided for the termination.
      - details (string) –
        
        The details provided for the termination.
      - childPolicy (string) –
        
        The policy used for the child workflow executions of this workflow execution.
        
        The supported child policies are:
        
        TERMINATE – The child executions are terminated.
        
        REQUEST_CANCEL – A request to cancel is attempted for each child execution by recording a WorkflowExecutionCancelRequested event in its history. It is up to the decider to take appropriate actions when it receives an execution history with this event.
        
        ABANDON – No action is taken. The child executions continue to run.
      - cause (string) –
        
        If set, indicates that the workflow execution was automatically terminated, and specifies the cause. This happens if the parent workflow execution times out or is terminated and the child policy is set to terminate child executions.
    - workflowExecutionCancelRequestedEventAttributes (dict) –
      
      If the event is of type WorkflowExecutionCancelRequested then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - externalWorkflowExecution (dict) –
        
        The external workflow execution for which the cancellation was requested.
        
        workflowId (string) –
        
        The user defined identifier associated with the workflow execution.
        
        runId (string) –
        
        A system-generated unique identifier for the workflow execution.
      - externalInitiatedEventId (integer) –
        
        The ID of the RequestCancelExternalWorkflowExecutionInitiated event corresponding to the RequestCancelExternalWorkflowExecution decision to cancel this workflow execution.The source event with this ID can be found in the history of the source workflow execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - cause (string) –
        
        If set, indicates that the request to cancel the workflow execution was automatically generated, and specifies the cause. This happens if the parent workflow execution times out or is terminated, and the child policy is set to cancel child executions.
    - decisionTaskScheduledEventAttributes (dict) –
      
      If the event is of type DecisionTaskScheduled then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - taskList (dict) –
        
        The name of the task list in which the decision task was scheduled.
        
        name (string) –
        
        The name of the task list.
      - taskPriority (string) –
        
        A task priority that, if set, specifies the priority for this decision task. Valid values are integers that range from Java’s Integer.MIN_VALUE (-2147483648) to Integer.MAX_VALUE (2147483647). Higher numbers indicate higher priority.
        
        For more information about setting task priority, see Setting Task Priority in the Amazon SWF Developer Guide.
      - startToCloseTimeout (string) –
        
        The maximum duration for this decision task. The task is considered timed out if it doesn’t completed within this duration.
        
        The duration is specified in seconds, an integer greater than or equal to 0. You can use NONE to specify unlimited duration.
      - scheduleToStartTimeout (string) –
        
        The maximum amount of time the decision task can wait to be assigned to a worker.
    - decisionTaskStartedEventAttributes (dict) –
      
      If the event is of type DecisionTaskStarted then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - identity (string) –
        
        Identity of the decider making the request. This enables diagnostic tracing when problems arise. The form of this identity is user defined.
      - scheduledEventId (integer) –
        
        The ID of the DecisionTaskScheduled event that was recorded when this decision task was scheduled. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - decisionTaskCompletedEventAttributes (dict) –
      
      If the event is of type DecisionTaskCompleted then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - executionContext (string) –
        
        User defined context for the workflow execution.
      - scheduledEventId (integer) –
        
        The ID of the DecisionTaskScheduled event that was recorded when this decision task was scheduled. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - startedEventId (integer) –
        
        The ID of the DecisionTaskStarted event recorded when this decision task was started. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - taskList (dict) –
        
        Represents a task list.
        
        name (string) –
        
        The name of the task list.
      - taskListScheduleToStartTimeout (string) –
        
        The maximum amount of time the decision task can wait to be assigned to a worker.
    - decisionTaskTimedOutEventAttributes (dict) –
      
      If the event is of type DecisionTaskTimedOut then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - timeoutType (string) –
        
        The type of timeout that expired before the decision task could be completed.
      - scheduledEventId (integer) –
        
        The ID of the DecisionTaskScheduled event that was recorded when this decision task was scheduled. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - startedEventId (integer) –
        
        The ID of the DecisionTaskStarted event recorded when this decision task was started. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - activityTaskScheduledEventAttributes (dict) –
      
      If the event is of type ActivityTaskScheduled then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - activityType (dict) –
        
        The type of the activity task.
        
        name (string) –
        
        The name of this activity.
        
        Note
        The combination of activity type name and version must be unique within a domain.
        
        version (string) –
        
        The version of this activity.
        
        Note
        The combination of activity type name and version must be unique with in a domain.
      - activityId (string) –
        
        The unique ID of the activity task.
      - input (string) –
        
        The input provided to the activity task.
      - control (string) –
        
        Data attached to the event that can be used by the decider in subsequent workflow tasks. This data isn’t sent to the activity.
      - scheduleToStartTimeout (string) –
        
        The maximum amount of time the activity task can wait to be assigned to a worker.
      - scheduleToCloseTimeout (string) –
        
        The maximum amount of time for this activity task.
      - startToCloseTimeout (string) –
        
        The maximum amount of time a worker may take to process the activity task.
      - taskList (dict) –
        
        The task list in which the activity task has been scheduled.
        
        name (string) –
        
        The name of the task list.
      - taskPriority (string) –
        
        The priority to assign to the scheduled activity task. If set, this overrides any default priority value that was assigned when the activity type was registered.
        
        Valid values are integers that range from Java’s Integer.MIN_VALUE (-2147483648) to Integer.MAX_VALUE (2147483647). Higher numbers indicate higher priority.
        
        For more information about setting task priority, see Setting Task Priority in the Amazon SWF Developer Guide.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision that resulted in the scheduling of this activity task. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - heartbeatTimeout (string) –
        
        The maximum time before which the worker processing this task must report progress by calling RecordActivityTaskHeartbeat. If the timeout is exceeded, the activity task is automatically timed out. If the worker subsequently attempts to record a heartbeat or return a result, it is ignored.
    - activityTaskStartedEventAttributes (dict) –
      
      If the event is of type ActivityTaskStarted then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - identity (string) –
        
        Identity of the worker that was assigned this task. This aids diagnostics when problems arise. The form of this identity is user defined.
      - scheduledEventId (integer) –
        
        The ID of the ActivityTaskScheduled event that was recorded when this activity task was scheduled. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - activityTaskCompletedEventAttributes (dict) –
      
      If the event is of type ActivityTaskCompleted then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - result (string) –
        
        The results of the activity task.
      - scheduledEventId (integer) –
        
        The ID of the ActivityTaskScheduled event that was recorded when this activity task was scheduled. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - startedEventId (integer) –
        
        The ID of the ActivityTaskStarted event recorded when this activity task was started. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - activityTaskFailedEventAttributes (dict) –
      
      If the event is of type ActivityTaskFailed then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - reason (string) –
        
        The reason provided for the failure.
      - details (string) –
        
        The details of the failure.
      - scheduledEventId (integer) –
        
        The ID of the ActivityTaskScheduled event that was recorded when this activity task was scheduled. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - startedEventId (integer) –
        
        The ID of the ActivityTaskStarted event recorded when this activity task was started. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - activityTaskTimedOutEventAttributes (dict) –
      
      If the event is of type ActivityTaskTimedOut then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - timeoutType (string) –
        
        The type of the timeout that caused this event.
      - scheduledEventId (integer) –
        
        The ID of the ActivityTaskScheduled event that was recorded when this activity task was scheduled. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - startedEventId (integer) –
        
        The ID of the ActivityTaskStarted event recorded when this activity task was started. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - details (string) –
        
        Contains the content of the details parameter for the last call made by the activity to RecordActivityTaskHeartbeat.
    - activityTaskCanceledEventAttributes (dict) –
      
      If the event is of type ActivityTaskCanceled then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - details (string) –
        
        Details of the cancellation.
      - scheduledEventId (integer) –
        
        The ID of the ActivityTaskScheduled event that was recorded when this activity task was scheduled. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - startedEventId (integer) –
        
        The ID of the ActivityTaskStarted event recorded when this activity task was started. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - latestCancelRequestedEventId (integer) –
        
        If set, contains the ID of the last ActivityTaskCancelRequested event recorded for this activity task. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - activityTaskCancelRequestedEventAttributes (dict) –
      
      If the event is of type ActivityTaskcancelRequested then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the RequestCancelActivityTask decision for this cancellation request. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - activityId (string) –
        
        The unique ID of the task.
    - workflowExecutionSignaledEventAttributes (dict) –
      
      If the event is of type WorkflowExecutionSignaled then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - signalName (string) –
        
        The name of the signal received. The decider can use the signal name and inputs to determine how to the process the signal.
      - input (string) –
        
        The inputs provided with the signal. The decider can use the signal name and inputs to determine how to process the signal.
      - externalWorkflowExecution (dict) –
        
        The workflow execution that sent the signal. This is set only of the signal was sent by another workflow execution.
        
        workflowId (string) –
        
        The user defined identifier associated with the workflow execution.
        
        runId (string) –
        
        A system-generated unique identifier for the workflow execution.
      - externalInitiatedEventId (integer) –
        
        The ID of the SignalExternalWorkflowExecutionInitiated event corresponding to the SignalExternalWorkflow decision to signal this workflow execution.The source event with this ID can be found in the history of the source workflow execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event. This field is set only if the signal was initiated by another workflow execution.
    - markerRecordedEventAttributes (dict) –
      
      If the event is of type MarkerRecorded then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - markerName (string) –
        
        The name of the marker.
      - details (string) –
        
        The details of the marker.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the RecordMarker decision that requested this marker. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - recordMarkerFailedEventAttributes (dict) –
      
      If the event is of type DecisionTaskFailed then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - markerName (string) –
        
        The marker’s name.
      - cause (string) –
        
        The cause of the failure. This information is generated by the system and can be useful for diagnostic purposes.
        
        Note
        If cause is set to OPERATION_NOT_PERMITTED, the decision failed because it lacked sufficient permissions. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the RecordMarkerFailed decision for this cancellation request. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - timerStartedEventAttributes (dict) –
      
      If the event is of type TimerStarted then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - timerId (string) –
        
        The unique ID of the timer that was started.
      - control (string) –
        
        Data attached to the event that can be used by the decider in subsequent workflow tasks.
      - startToFireTimeout (string) –
        
        The duration of time after which the timer fires.
        
        The duration is specified in seconds, an integer greater than or equal to 0.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the StartTimer decision for this activity task. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - timerFiredEventAttributes (dict) –
      
      If the event is of type TimerFired then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - timerId (string) –
        
        The unique ID of the timer that fired.
      - startedEventId (integer) –
        
        The ID of the TimerStarted event that was recorded when this timer was started. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - timerCanceledEventAttributes (dict) –
      
      If the event is of type TimerCanceled then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - timerId (string) –
        
        The unique ID of the timer that was canceled.
      - startedEventId (integer) –
        
        The ID of the TimerStarted event that was recorded when this timer was started. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the CancelTimer decision to cancel this timer. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - startChildWorkflowExecutionInitiatedEventAttributes (dict) –
      
      If the event is of type StartChildWorkflowExecutionInitiated then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - workflowId (string) –
        
        The workflowId of the child workflow execution.
      - workflowType (dict) –
        
        The type of the child workflow execution.
        
        name (string) –
        
        The name of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
        
        version (string) –
        
        The version of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
      - control (string) –
        
        Data attached to the event that can be used by the decider in subsequent decision tasks. This data isn’t sent to the activity.
      - input (string) –
        
        The inputs provided to the child workflow execution.
      - executionStartToCloseTimeout (string) –
        
        The maximum duration for the child workflow execution. If the workflow execution isn’t closed within this duration, it is timed out and force-terminated.
        
        The duration is specified in seconds, an integer greater than or equal to 0. You can use NONE to specify unlimited duration.
      - taskList (dict) –
        
        The name of the task list used for the decision tasks of the child workflow execution.
        
        name (string) –
        
        The name of the task list.
      - taskPriority (string) –
        
        The priority assigned for the decision tasks for this workflow execution. Valid values are integers that range from Java’s Integer.MIN_VALUE (-2147483648) to Integer.MAX_VALUE (2147483647). Higher numbers indicate higher priority.
        
        For more information about setting task priority, see Setting Task Priority in the Amazon SWF Developer Guide.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the StartChildWorkflowExecution Decision to request this child workflow execution. This information can be useful for diagnosing problems by tracing back the cause of events.
      - childPolicy (string) –
        
        The policy to use for the child workflow executions if this execution gets terminated by explicitly calling the TerminateWorkflowExecution action or due to an expired timeout.
        
        The supported child policies are:
        
        TERMINATE – The child executions are terminated.
        
        REQUEST_CANCEL – A request to cancel is attempted for each child execution by recording a WorkflowExecutionCancelRequested event in its history. It is up to the decider to take appropriate actions when it receives an execution history with this event.
        
        ABANDON – No action is taken. The child executions continue to run.
      - taskStartToCloseTimeout (string) –
        
        The maximum duration allowed for the decision tasks for this workflow execution.
        
        The duration is specified in seconds, an integer greater than or equal to 0. You can use NONE to specify unlimited duration.
      - tagList (list) –
        
        The list of tags to associated with the child workflow execution.
        
        (string) –
      - lambdaRole (string) –
        
        The IAM role to attach to the child workflow execution.
    - childWorkflowExecutionStartedEventAttributes (dict) –
      
      If the event is of type ChildWorkflowExecutionStarted then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - workflowExecution (dict) –
        
        The child workflow execution that was started.
        
        workflowId (string) –
        
        The user defined identifier associated with the workflow execution.
        
        runId (string) –
        
        A system-generated unique identifier for the workflow execution.
      - workflowType (dict) –
        
        The type of the child workflow execution.
        
        name (string) –
        
        The name of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
        
        version (string) –
        
        The version of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
      - initiatedEventId (integer) –
        
        The ID of the StartChildWorkflowExecutionInitiated event corresponding to the StartChildWorkflowExecution Decision to start this child workflow execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - childWorkflowExecutionCompletedEventAttributes (dict) –
      
      If the event is of type ChildWorkflowExecutionCompleted then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - workflowExecution (dict) –
        
        The child workflow execution that was completed.
        
        workflowId (string) –
        
        The user defined identifier associated with the workflow execution.
        
        runId (string) –
        
        A system-generated unique identifier for the workflow execution.
      - workflowType (dict) –
        
        The type of the child workflow execution.
        
        name (string) –
        
        The name of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
        
        version (string) –
        
        The version of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
      - result (string) –
        
        The result of the child workflow execution.
      - initiatedEventId (integer) –
        
        The ID of the StartChildWorkflowExecutionInitiated event corresponding to the StartChildWorkflowExecution Decision to start this child workflow execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - startedEventId (integer) –
        
        The ID of the ChildWorkflowExecutionStarted event recorded when this child workflow execution was started. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - childWorkflowExecutionFailedEventAttributes (dict) –
      
      If the event is of type ChildWorkflowExecutionFailed then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - workflowExecution (dict) –
        
        The child workflow execution that failed.
        
        workflowId (string) –
        
        The user defined identifier associated with the workflow execution.
        
        runId (string) –
        
        A system-generated unique identifier for the workflow execution.
      - workflowType (dict) –
        
        The type of the child workflow execution.
        
        name (string) –
        
        The name of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
        
        version (string) –
        
        The version of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
      - reason (string) –
        
        The reason for the failure (if provided).
      - details (string) –
        
        The details of the failure (if provided).
      - initiatedEventId (integer) –
        
        The ID of the StartChildWorkflowExecutionInitiated event corresponding to the StartChildWorkflowExecution Decision to start this child workflow execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - startedEventId (integer) –
        
        The ID of the ChildWorkflowExecutionStarted event recorded when this child workflow execution was started. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - childWorkflowExecutionTimedOutEventAttributes (dict) –
      
      If the event is of type ChildWorkflowExecutionTimedOut then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - workflowExecution (dict) –
        
        The child workflow execution that timed out.
        
        workflowId (string) –
        
        The user defined identifier associated with the workflow execution.
        
        runId (string) –
        
        A system-generated unique identifier for the workflow execution.
      - workflowType (dict) –
        
        The type of the child workflow execution.
        
        name (string) –
        
        The name of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
        
        version (string) –
        
        The version of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
      - timeoutType (string) –
        
        The type of the timeout that caused the child workflow execution to time out.
      - initiatedEventId (integer) –
        
        The ID of the StartChildWorkflowExecutionInitiated event corresponding to the StartChildWorkflowExecution Decision to start this child workflow execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - startedEventId (integer) –
        
        The ID of the ChildWorkflowExecutionStarted event recorded when this child workflow execution was started. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - childWorkflowExecutionCanceledEventAttributes (dict) –
      
      If the event is of type ChildWorkflowExecutionCanceled then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - workflowExecution (dict) –
        
        The child workflow execution that was canceled.
        
        workflowId (string) –
        
        The user defined identifier associated with the workflow execution.
        
        runId (string) –
        
        A system-generated unique identifier for the workflow execution.
      - workflowType (dict) –
        
        The type of the child workflow execution.
        
        name (string) –
        
        The name of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
        
        version (string) –
        
        The version of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
      - details (string) –
        
        Details of the cancellation (if provided).
      - initiatedEventId (integer) –
        
        The ID of the StartChildWorkflowExecutionInitiated event corresponding to the StartChildWorkflowExecution Decision to start this child workflow execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - startedEventId (integer) –
        
        The ID of the ChildWorkflowExecutionStarted event recorded when this child workflow execution was started. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - childWorkflowExecutionTerminatedEventAttributes (dict) –
      
      If the event is of type ChildWorkflowExecutionTerminated then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - workflowExecution (dict) –
        
        The child workflow execution that was terminated.
        
        workflowId (string) –
        
        The user defined identifier associated with the workflow execution.
        
        runId (string) –
        
        A system-generated unique identifier for the workflow execution.
      - workflowType (dict) –
        
        The type of the child workflow execution.
        
        name (string) –
        
        The name of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
        
        version (string) –
        
        The version of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
      - initiatedEventId (integer) –
        
        The ID of the StartChildWorkflowExecutionInitiated event corresponding to the StartChildWorkflowExecution Decision to start this child workflow execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - startedEventId (integer) –
        
        The ID of the ChildWorkflowExecutionStarted event recorded when this child workflow execution was started. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - signalExternalWorkflowExecutionInitiatedEventAttributes (dict) –
      
      If the event is of type SignalExternalWorkflowExecutionInitiated then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - workflowId (string) –
        
        The workflowId of the external workflow execution.
      - runId (string) –
        
        The runId of the external workflow execution to send the signal to.
      - signalName (string) –
        
        The name of the signal.
      - input (string) –
        
        The input provided to the signal.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the SignalExternalWorkflowExecution decision for this signal. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - control (string) –
        
        Data attached to the event that can be used by the decider in subsequent decision tasks.
    - externalWorkflowExecutionSignaledEventAttributes (dict) –
      
      If the event is of type ExternalWorkflowExecutionSignaled then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - workflowExecution (dict) –
        
        The external workflow execution that the signal was delivered to.
        
        workflowId (string) –
        
        The user defined identifier associated with the workflow execution.
        
        runId (string) –
        
        A system-generated unique identifier for the workflow execution.
      - initiatedEventId (integer) –
        
        The ID of the SignalExternalWorkflowExecutionInitiated event corresponding to the SignalExternalWorkflowExecution decision to request this signal. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - signalExternalWorkflowExecutionFailedEventAttributes (dict) –
      
      If the event is of type SignalExternalWorkflowExecutionFailed then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - workflowId (string) –
        
        The workflowId of the external workflow execution that the signal was being delivered to.
      - runId (string) –
        
        The runId of the external workflow execution that the signal was being delivered to.
      - cause (string) –
        
        The cause of the failure. This information is generated by the system and can be useful for diagnostic purposes.
        
        Note
        If cause is set to OPERATION_NOT_PERMITTED, the decision failed because it lacked sufficient permissions. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.
      - initiatedEventId (integer) –
        
        The ID of the SignalExternalWorkflowExecutionInitiated event corresponding to the SignalExternalWorkflowExecution decision to request this signal. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the SignalExternalWorkflowExecution decision for this signal. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - control (string) –
        
        The data attached to the event that the decider can use in subsequent workflow tasks. This data isn’t sent to the workflow execution.
    - externalWorkflowExecutionCancelRequestedEventAttributes (dict) –
      
      If the event is of type ExternalWorkflowExecutionCancelRequested then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - workflowExecution (dict) –
        
        The external workflow execution to which the cancellation request was delivered.
        
        workflowId (string) –
        
        The user defined identifier associated with the workflow execution.
        
        runId (string) –
        
        A system-generated unique identifier for the workflow execution.
      - initiatedEventId (integer) –
        
        The ID of the RequestCancelExternalWorkflowExecutionInitiated event corresponding to the RequestCancelExternalWorkflowExecution decision to cancel this external workflow execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - requestCancelExternalWorkflowExecutionInitiatedEventAttributes (dict) –
      
      If the event is of type RequestCancelExternalWorkflowExecutionInitiated then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - workflowId (string) –
        
        The workflowId of the external workflow execution to be canceled.
      - runId (string) –
        
        The runId of the external workflow execution to be canceled.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the RequestCancelExternalWorkflowExecution decision for this cancellation request. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - control (string) –
        
        Data attached to the event that can be used by the decider in subsequent workflow tasks.
    - requestCancelExternalWorkflowExecutionFailedEventAttributes (dict) –
      
      If the event is of type RequestCancelExternalWorkflowExecutionFailed then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - workflowId (string) –
        
        The workflowId of the external workflow to which the cancel request was to be delivered.
      - runId (string) –
        
        The runId of the external workflow execution.
      - cause (string) –
        
        The cause of the failure. This information is generated by the system and can be useful for diagnostic purposes.
        
        Note
        If cause is set to OPERATION_NOT_PERMITTED, the decision failed because it lacked sufficient permissions. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.
      - initiatedEventId (integer) –
        
        The ID of the RequestCancelExternalWorkflowExecutionInitiated event corresponding to the RequestCancelExternalWorkflowExecution decision to cancel this external workflow execution. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the RequestCancelExternalWorkflowExecution decision for this cancellation request. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
      - control (string) –
        
        The data attached to the event that the decider can use in subsequent workflow tasks. This data isn’t sent to the workflow execution.
    - scheduleActivityTaskFailedEventAttributes (dict) –
      
      If the event is of type ScheduleActivityTaskFailed then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - activityType (dict) –
        
        The activity type provided in the ScheduleActivityTask decision that failed.
        
        name (string) –
        
        The name of this activity.
        
        Note
        The combination of activity type name and version must be unique within a domain.
        
        version (string) –
        
        The version of this activity.
        
        Note
        The combination of activity type name and version must be unique with in a domain.
      - activityId (string) –
        
        The activityId provided in the ScheduleActivityTask decision that failed.
      - cause (string) –
        
        The cause of the failure. This information is generated by the system and can be useful for diagnostic purposes.
        
        Note
        If cause is set to OPERATION_NOT_PERMITTED, the decision failed because it lacked sufficient permissions. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision that resulted in the scheduling of this activity task. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - requestCancelActivityTaskFailedEventAttributes (dict) –
      
      If the event is of type RequestCancelActivityTaskFailed then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - activityId (string) –
        
        The activityId provided in the RequestCancelActivityTask decision that failed.
      - cause (string) –
        
        The cause of the failure. This information is generated by the system and can be useful for diagnostic purposes.
        
        Note
        If cause is set to OPERATION_NOT_PERMITTED, the decision failed because it lacked sufficient permissions. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the RequestCancelActivityTask decision for this cancellation request. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - startTimerFailedEventAttributes (dict) –
      
      If the event is of type StartTimerFailed then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - timerId (string) –
        
        The timerId provided in the StartTimer decision that failed.
      - cause (string) –
        
        The cause of the failure. This information is generated by the system and can be useful for diagnostic purposes.
        
        Note
        If cause is set to OPERATION_NOT_PERMITTED, the decision failed because it lacked sufficient permissions. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the StartTimer decision for this activity task. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - cancelTimerFailedEventAttributes (dict) –
      
      If the event is of type CancelTimerFailed then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - timerId (string) –
        
        The timerId provided in the CancelTimer decision that failed.
      - cause (string) –
        
        The cause of the failure. This information is generated by the system and can be useful for diagnostic purposes.
        
        Note
        If cause is set to OPERATION_NOT_PERMITTED, the decision failed because it lacked sufficient permissions. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the CancelTimer decision to cancel this timer. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.
    - startChildWorkflowExecutionFailedEventAttributes (dict) –
      
      If the event is of type StartChildWorkflowExecutionFailed then this member is set and provides detailed information about the event. It isn’t set for other event types.
      - workflowType (dict) –
        
        The workflow type provided in the StartChildWorkflowExecution Decision that failed.
        
        name (string) –
        
        The name of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
        
        version (string) –
        
        The version of the workflow type.
        
        Note
        The combination of workflow type name and version must be unique with in a domain.
      - cause (string) –
        
        The cause of the failure. This information is generated by the system and can be useful for diagnostic purposes.
        
        Note
        When cause is set to OPERATION_NOT_PERMITTED, the decision fails because it lacks sufficient permissions. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.
      - workflowId (string) –
        
        The workflowId of the child workflow execution.
      - initiatedEventId (integer) –
        
        When the cause is WORKFLOW_ALREADY_RUNNING, initiatedEventId is the ID of the StartChildWorkflowExecutionInitiated event that corresponds to the StartChildWorkflowExecution Decision to start the workflow execution. You can use this information to diagnose problems by tracing back the chain of events leading up to this event.
        
        When the cause isn’t WORKFLOW_ALREADY_RUNNING, initiatedEventId is set to 0 because the StartChildWorkflowExecutionInitiated event doesn’t exist.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the DecisionTaskCompleted event corresponding to the decision task that resulted in the StartChildWorkflowExecution Decision to request this child workflow execution. This information can be useful for diagnosing problems by tracing back the chain of events.
      - control (string) –
        
        The data attached to the event that the decider can use in subsequent workflow tasks. This data isn’t sent to the child workflow execution.
    - lambdaFunctionScheduledEventAttributes (dict) –
      
      Provides the details of the LambdaFunctionScheduled event. It isn’t set for other event types.
      - id (string) –
        
        The unique ID of the Lambda task.
      - name (string) –
        
        The name of the Lambda function.
      - control (string) –
        
        Data attached to the event that the decider can use in subsequent workflow tasks. This data isn’t sent to the Lambda task.
      - input (string) –
        
        The input provided to the Lambda task.
      - startToCloseTimeout (string) –
        
        The maximum amount of time a worker can take to process the Lambda task.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the LambdaFunctionCompleted event corresponding to the decision that resulted in scheduling this activity task. To help diagnose issues, use this information to trace back the chain of events leading up to this event.
    - lambdaFunctionStartedEventAttributes (dict) –
      
      Provides the details of the LambdaFunctionStarted event. It isn’t set for other event types.
      - scheduledEventId (integer) –
        
        The ID of the LambdaFunctionScheduled event that was recorded when this activity task was scheduled. To help diagnose issues, use this information to trace back the chain of events leading up to this event.
    - lambdaFunctionCompletedEventAttributes (dict) –
      
      Provides the details of the LambdaFunctionCompleted event. It isn’t set for other event types.
      - scheduledEventId (integer) –
        
        The ID of the LambdaFunctionScheduled event that was recorded when this Lambda task was scheduled. To help diagnose issues, use this information to trace back the chain of events leading up to this event.
      - startedEventId (integer) –
        
        The ID of the LambdaFunctionStarted event recorded when this activity task started. To help diagnose issues, use this information to trace back the chain of events leading up to this event.
      - result (string) –
        
        The results of the Lambda task.
    - lambdaFunctionFailedEventAttributes (dict) –
      
      Provides the details of the LambdaFunctionFailed event. It isn’t set for other event types.
      - scheduledEventId (integer) –
        
        The ID of the LambdaFunctionScheduled event that was recorded when this activity task was scheduled. To help diagnose issues, use this information to trace back the chain of events leading up to this event.
      - startedEventId (integer) –
        
        The ID of the LambdaFunctionStarted event recorded when this activity task started. To help diagnose issues, use this information to trace back the chain of events leading up to this event.
      - reason (string) –
        
        The reason provided for the failure.
      - details (string) –
        
        The details of the failure.
    - lambdaFunctionTimedOutEventAttributes (dict) –
      
      Provides the details of the LambdaFunctionTimedOut event. It isn’t set for other event types.
      - scheduledEventId (integer) –
        
        The ID of the LambdaFunctionScheduled event that was recorded when this activity task was scheduled. To help diagnose issues, use this information to trace back the chain of events leading up to this event.
      - startedEventId (integer) –
        
        The ID of the ActivityTaskStarted event that was recorded when this activity task started. To help diagnose issues, use this information to trace back the chain of events leading up to this event.
      - timeoutType (string) –
        
        The type of the timeout that caused this event.
    - scheduleLambdaFunctionFailedEventAttributes (dict) –
      
      Provides the details of the ScheduleLambdaFunctionFailed event. It isn’t set for other event types.
      - id (string) –
        
        The ID provided in the ScheduleLambdaFunction decision that failed.
      - name (string) –
        
        The name of the Lambda function.
      - cause (string) –
        
        The cause of the failure. To help diagnose issues, use this information to trace back the chain of events leading up to this event.
        
        Note
        If cause is set to OPERATION_NOT_PERMITTED, the decision failed because it lacked sufficient permissions. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.
      - decisionTaskCompletedEventId (integer) –
        
        The ID of the LambdaFunctionCompleted event corresponding to the decision that resulted in scheduling this Lambda task. To help diagnose issues, use this information to trace back the chain of events leading up to this event.
    - startLambdaFunctionFailedEventAttributes (dict) –
      
      Provides the details of the StartLambdaFunctionFailed event. It isn’t set for other event types.
      - scheduledEventId (integer) –
        
        The ID of the ActivityTaskScheduled event that was recorded when this activity task was scheduled. To help diagnose issues, use this information to trace back the chain of events leading up to this event.
      - cause (string) –
        
        The cause of the failure. To help diagnose issues, use this information to trace back the chain of events leading up to this event.
        
        Note
        If cause is set to OPERATION_NOT_PERMITTED, the decision failed because the IAM role attached to the execution lacked sufficient permissions. For details and example IAM policies, see Lambda Tasks in the Amazon SWF Developer Guide.
      - message (string) –
        
        A description that can help diagnose the cause of the fault.
- nextPageToken (string) –
  
  If a NextPageToken was returned by a previous call, there are more results available. To retrieve the next page of results, make the call again using the returned token in nextPageToken. Keep all other arguments unchanged.
  
  The configured maximumPageSize determines how many results can be returned in a single call.
- previousStartedEventId (integer) –
  
  The ID of the DecisionTaskStarted event of the previous decision task of this workflow execution that was processed by the decider. This can be used to determine the events in the history new since the last decision task received by the decider.

poll_for_decision_task#

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Exceptions