Amazon SWF Quotas

Maximum registered domains – 100

This quota includes both registered and deprecated domains.

Maximum workflow and activity types – 10,000 each per domain

This quota includes both registered and deprecated types.

API call quota – Beyond infrequent spikes, applications may be throttled if they make a large number of API calls in a very short period of time.

Maximum request size – 1 MB per request

This is the total data size per Amazon SWF API request, including the request header and all other associated request data.

Truncated responses for Count APIs – Indicates that an internal quota was reached and that the response is not the full count.

Some queries will internally reach the 1 MB quota mentioned above before returning a full response. The following can return a truncated response instead of the full count.

For each of these, if the truncated response is set to true, the count is less than the full amount. This internal quota can not be increased.

Maximum number of tags – 50 tags per resource.

Attempting to add tags beyond 50 will result in a 400 error, TooManyTagsFault.

Maximum open workflow executions – 100,000 per domain

This count includes child workflow executions.

Maximum workflow execution time – 1 year. This is a hard quota that can't be changed.

Maximum workflow execution history size – 25,000 events. This is a hard quota that can't be changed.

Best practice is to structure each workflow such that its history does not grow beyond 10,000 events. Since the decider has to fetch the workflow history, a smaller history allows the decider to complete more quickly. If using the Flow Framework, you can use ContinueAsNew to continue a workflow with a fresh history.

Maximum open child workflow executions – 1,000 per workflow execution

Workflow execution idle time quota – 1 year (constrained by workflow execution time maximum)

You can configure workflow timeouts to cause a timeout event to occur if a particular stage of your workflow takes too long.

Workflow retention time quota – 90 days

After this time, the workflow history can no longer be retrieved or viewed. There is no further limit to the number of closed workflow executions that are retained by Amazon SWF.

Maximum pollers per task list – 1,000 per task list

You can have a maximum of 1,000 pollers which simultaneously poll a particular task list. If you go over 1,000, you receive a LimitExceededException.

Maximum tasks scheduled per second – 2,000 per task list

You can schedule a maximum of 2,000 tasks per second on a particular task list. If you exceed 2,000, your ScheduleActivityTask decisions will fail with ACTIVITY_CREATION_RATE_EXCEEDED error.

Maximum task execution time – 1 year (constrained by workflow execution time maximum)

You can configure activity timeouts to cause a timeout event to occur if a particular stage of your activity task execution takes too long.

Maximum time SWF will keep a task in the queue – 1 year (constrained by workflow execution time quota)

You can configure default activity timeouts during activity registration that will cause a timeout event to occur if a particular stage of your activity task execution takes too long. You can also override the default activity timeouts when you schedule an activity task in your decider code.

Maximum open activity tasks – 1,000 per workflow execution.

This quota includes both activity tasks that have been scheduled and those being processed by workers.

Maximum open timers – 1,000 per workflow execution

Maximum input/result data size – 32,768 characters

This quota affects activity or workflow execution result data, input data when scheduling activity tasks or workflow executions, and input sent with a workflow execution signal.

Maximum decisions in a decision task response – varies

Due to the 1 MB quota on the maximum API request size, the number of decisions returned in a single call to RespondDecisionTaskCompleted will be limited according to the size of the data used by each decision, including the size of any input data provided to scheduled activity tasks or to workflow executions.