Used by workers to tell the service that the ActivityTask identified
taskToken was successfully canceled. Additional
be provided using the
details (if provided) appear in the
ActivityTaskCanceled event added to the workflow history.
Only use this operation if the
canceled flag of a RecordActivityTaskHeartbeat request returns
true and if the
activity can be safely undone or abandoned.
A task is considered open from the time that it is scheduled until it is closed. Therefore a task is reported as open while a worker is processing it. A task is closed after it has been specified in a call to RespondActivityTaskCompleted, RespondActivityTaskCanceled, RespondActivityTaskFailed, or the task has timed out.
You can use IAM policies to control this action's access to Amazon SWF resources as follows:
Resource element with the domain name to limit the action to
only specified domains.
Action element to allow or deny permission to call this
You cannot use an IAM policy to constrain this action's parameters.
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
cause parameter is set to
For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF
Workflows in the Amazon SWF Developer Guide.