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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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AWS Serverless Exercises

Test Yourself With Exercises

Exercise:

What are two types of errors when you call a function?

1.  error
2.  error

Start the Exercise