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https://issues.apache.org/jira/browse/AIRFLOW-5218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16907762#comment-16907762
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ASF GitHub Bot commented on AIRFLOW-5218:
-----------------------------------------
darrenleeweber commented on pull request #5825: [AIRFLOW-5218] less polling for
AWS Batch status
URL: https://github.com/apache/airflow/pull/5825
### Jira
- [x] My PR addresses the following [Airflow Jira]
- https://issues.apache.org/jira/browse/AIRFLOW-5218
### Description
- [x] Here are some details about my PR, including screenshots of any UI
changes:
- a small increase in the backoff factor could avoid excessive polling
- avoid the AWS API throttle limits for highly concurrent tasks
### Tests
- [ ] My PR does not need testing for this extremely good reason:
- it's the smallest possible change that might address the issue
- the change does not impact any public API
- if there are tests on the polling interval (or should be), LMK
### Commits
- [x] My commits all reference Jira issues in their subject lines
- it's just one commit
- the commit message is succinct, LMK if you want it amended
### Documentation
- [x] In case of new functionality, my PR adds documentation that describes
how to use it.
- no changes required to documentation
### Code Quality
- [ ] Passes `flake8`
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> AWS Batch Operator - status polling too often, esp. for high concurrency
> ------------------------------------------------------------------------
>
> Key: AIRFLOW-5218
> URL: https://issues.apache.org/jira/browse/AIRFLOW-5218
> Project: Apache Airflow
> Issue Type: Improvement
> Components: aws, contrib
> Affects Versions: 1.10.4
> Reporter: Darren Weber
> Priority: Major
>
> The AWS Batch Operator attempts to use a boto3 feature that is not available
> and has not been merged in years, see
> - [https://github.com/boto/botocore/pull/1307]
> - see also [https://github.com/broadinstitute/cromwell/issues/4303]
> This is a curious case of premature optimization. So, in the meantime, this
> means that the fallback is the exponential backoff routine for the status
> checks on the batch job. Unfortunately, when the concurrency of Airflow jobs
> is very high (100's of tasks), this fallback polling hits the AWS Batch API
> too hard and the AWS API throttle throws an error, which fails the Airflow
> task, simply because the status is polled too frequently.
> Check the output from the retry algorithm, e.g. within the first 10 retries,
> the status of an AWS batch job is checked about 10 times at a rate that is
> approx 1 retry/sec. When an Airflow instance is running 10's or 100's of
> concurrent batch jobs, this hits the API too frequently and crashes the
> Airflow task (plus it occupies a worker in too much busy work).
> {code:java}
> In [4]: [1 + pow(retries * 0.1, 2) for retries in range(20)]
> Out[4]:
> [1.0,
> 1.01,
> 1.04,
> 1.09,
> 1.1600000000000001,
> 1.25,
> 1.36,
> 1.4900000000000002,
> 1.6400000000000001,
> 1.81,
> 2.0,
> 2.21,
> 2.4400000000000004,
> 2.6900000000000004,
> 2.9600000000000004,
> 3.25,
> 3.5600000000000005,
> 3.8900000000000006,
> 4.24,
> 4.61]{code}
> Possible solutions are to introduce an initial sleep (say 60 sec?) right
> after issuing the request, so that the batch job has some time to spin up.
> The job progresses through a through phases before it gets to RUNNING state
> and polling for each phase of that sequence might help. Since batch jobs tend
> to be long-running jobs (rather than near-real time jobs), it might help to
> issue less frequent polls when it's in the RUNNING state. Something on the
> order of 10's seconds might be reasonable for batch jobs? Maybe the class
> could expose a parameter for the rate of polling (or a callable)?
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