AWS Serverless Error Handling for Synchronous and Asynchronous Events
Error Handling for Synchronous and Asynchronous Events
There are two sorts of errors that can happen when you call a function:
- Function errors
- Call errors
Function error happens when Lambda correctly passes an event to your function, but the function throws an error before finishing.
A call error happens when the request is refused before it is received by your function.
An example of a call error could be an excessive payload or a lack of permissions.
Error Handling for Synchronous Events
There are no built-in retries in a synchronous call.
Error handling must be handled by you.
All forms of errors and retries should be handled.
An example of a synchronous event is a call between API Gateway and Lambda.
Error Handling for Asynchronous Events
Lambda has built-in retry features for asynchronous event sources like Amazon S3.
When Lambda receives an asynchronous event, it responds with a "success".
Then, it sends call requests to your function from a queue.
By default, Lambda retries the call request two more times if it returns function errors.
This retry value can be set between 0 and 2.
Lambda retries the call request for up to 6 hours if it returns call errors.
The call is also known as a function call.
Error Handling for Synchronous and Asynchronous Events Video
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