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I am having a lot of issues handling concurrent runs of a StateMachine (Step Function) that does have a GlueJob task in it.

The state machine is initiated by a Lambda that gets trigger by a FIFO SQS queue.

The lambda gets the message, checks how many of state machine instances are running and if this number is below the GlueJob concurrent runs threshold, it starts the State Machine.

The problem I am having is that this check fails most of the time. The state machine starts although there is not enough concurrency available for my GlueJob. Obviously, the message the SQS queue passes to lambda gets processed, so if the state machine fails for this reason, that message is gone forever (unless I catch the exception and send back a new message to the queue).

I believe this behavior is due to the speed messages gets processed by my lambda (although it's a FIFO queue, so 1 message at a time), and the fact that my checker cannot keep up.

I have implemented some time.sleep() here and there to see if things get better, but no substantial improvement.

I would like to ask you if you have ever had issues like this one and how you got them programmatically solved.

Thanks in advance!

This is my checker:

I'm developing an API with Spring Boot and currently, I'm thinking about how to handle error messages in an easily internationalizable way. My goals are as follows:

1. Define error messages in resource files/bundles
2. Connect constraint annotation with error messages (e.g., @Length) in a declarative fashion
3. Error messages contain placeholders, such as {min}, that are replaced by the corresponding value from the annotation, if available, e.g., @Length(min = 5, message = msg) would result in something like msg.replace("{min}", annotation.min()).replace("{max}", annotation.max()).
4. The JSON property path is also available as a placeholder and automatically inserted into the error message when a validation error occurs.
5. A solution outside of an error handler is preferred, i.e., when the exceptions arrive in the error handler, they already contain the desired error messages.
6. Error messages from a resource bundle are automatically registered as constants in Java.

Currently, I customized the methodArgumentNotValidHandler of my error handler class to read ObjectErrors from e.getBindingResult().getAllErrors() and then try to extract their arguments and error codes to decide which error message to choose from my resource bundle and format it accordingly. A rough sketch of my code looks as follows:

Input:

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To illustrate my issues, I created a demo project here (just click "next" and see that when the video stops, sometimes it goes backward). The full code is here.

The important part of the code I'm using is:

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simulate data: the list l

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The code I tried to wrap the callback into an awaitable is adapted from here: https://books.google.de/books?id=tJIREAAAQBAJ&pg=PA457