Added Feature: retry strategy parameter to Amazon AWS Batch Operator

[evgenyslab]

Added retry_strategy parameter to providers/amazon/aws/operators/batch.py that is passed to the boto3 client as retryStrategy per the syntax found here:
https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/batch/client/submit_job.html

This allows definition of custom retry strategies from Airflow side instead of relying on job definitions.

[boring-cyborg]

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[harishkesavarao]

Nice!

[boring-cyborg]

Awesome work, congrats on your first merged pull request! You are invited to check our Issue Tracker for additional contributions.

[potiuk]

Nice indeed :)

[o-nikolas]

@evgenyslab Looks like this change has broken the example_batch system test: https://aws-mwaa.github.io/#/open-source/system-tests/dashboard.html

  File "/opt/airflow/airflow/providers/amazon/aws/operators/batch.py", line 236, in execute
    self.submit_job(context)

  File "/opt/airflow/airflow/providers/amazon/aws/operators/batch.py", line 307, in submit_job
    raise AirflowException(e)

airflow.exceptions.AirflowException: An error occurred (ClientException) when calling the SubmitJob operation: Error executing request, Exception : RetryAttempts must be provided with retry strategy, RequestId: cbdc8976-4998-4f73-b453-70cb3d9b8ba9

[ferruzzi]

I think this needs to default to {"attempts": 1} and likely needs some logic to enforce that a provided value contains a valid "attempts" field.

[ferruzzi]

Submitted a PR here to fix it.