Function Compute:Configure a retry mechanism

If a function fails to be executed, its invocation method determines whether Function Compute automatically retries the function.

• Failed synchronous invocations

  Function Compute does not automatically retry the function. You can manually retry the function.

• Failed asynchronous invocations

  The following table lists the situations in which Function Compute automatically retries.

  Error type	Server behavior	Billable	Solution
  HandledInvocationError and UnhandledInvocationError errors of Function Compute	By default, Function Compute retries the function up to three times. You can change the number of retries based on your business requirements.	Billed based on the number of invocations. For more information about billing, see Billing overview.	Troubleshoot your code.
  Execution concurrency upper limit exceeded	Function Compute retries the execution for up to 5 hours in binary exponential back-off mode. If your function execution fails, retries start 0.5 seconds later. Subsequent retry intervals are calculated in binary exponential backoff mode. The wait intervals between retries double with each attempt, starting at 1 second, then 2 seconds, 4 seconds, 8 seconds, and so forth. This pattern continues for up to 5 hours.	No	By default, the maximum number of on-demand instances allowed for your Alibaba Cloud account in a single region is 300. If you need to increase this limit, join the DingTalk group 64970014484 for technical support.
  Internal error		No	Join the DingTalk group 64970014484 for technical support.
  Insufficient Function Compute resources		No