[
https://issues.apache.org/jira/browse/AIRFLOW-5889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Darren Weber updated AIRFLOW-5889:
----------------------------------
Description:
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. This results in Airflow
issuing a retry of this task, when the task is actually running already,
resulting in duplicate batch jobs. Any exception thrown for an AWS API
throttle limit should not fail the task, but just pause the polling for job
status and retry the job status poll.
This is an example of an API throttle exception:
```
An error occurred (TooManyRequestsException) when calling the DescribeJobs
operation (reached max retries: 4): Too Many Requests
```
This exception should be handled while waiting for a job to complete, it must
not result in a job-retry.
Reduced polling rates help
(https://issues.apache.org/jira/browse/AIRFLOW-5218), but additional exception
handling in the polling function is required. Within the exception handling
code, a random pause on the polling routine could help to alleviate the API
throttle limits. Maybe the class could expose a parameter for the rate of
polling (or a callable)?
Another consideration is possible use of something like the sensor-poke
approach, with rescheduling, so that the polling process does not occupy a
worker for the full duration of a batch job, e.g.
-
[https://github.com/apache/airflow/blob/master/airflow/sensors/base_sensor_operator.py#L117]
If a rescheduling approach is adopted, the similar API throttle considerations
apply.
was:
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. This results in Airflow
issuing a retry of this task, when the task is actually running already,
resulting in duplicate batch jobs. Any exception thrown for an AWS API
throttle limit should not fail the task, but just pause the polling for job
status and retry the job status poll.
Reduced polling rates help
(https://issues.apache.org/jira/browse/AIRFLOW-5218), but additional exception
handling in the polling function is required. Within the exception handling
code, a random pause on the polling routine could help to alleviate the API
throttle limits. Maybe the class could expose a parameter for the rate of
polling (or a callable)?
Another consideration is possible use of something like the sensor-poke
approach, with rescheduling, so that the polling process does not occupy a
worker for the full duration of a batch job, e.g.
-
[https://github.com/apache/airflow/blob/master/airflow/sensors/base_sensor_operator.py#L117]
If a rescheduling approach is adopted, the similar API throttle considerations
apply.
> AWS Batch Operator - API request limits should not fail a task
> --------------------------------------------------------------
>
> Key: AIRFLOW-5889
> URL: https://issues.apache.org/jira/browse/AIRFLOW-5889
> Project: Apache Airflow
> Issue Type: Improvement
> Components: aws, contrib
> Affects Versions: 1.10.4
> Reporter: Darren Weber
> Assignee: Darren Weber
> Priority: Major
> Fix For: 2.0.0, 1.10.6
>
>
> 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. This results in
> Airflow issuing a retry of this task, when the task is actually running
> already, resulting in duplicate batch jobs. Any exception thrown for an AWS
> API throttle limit should not fail the task, but just pause the polling for
> job status and retry the job status poll.
> This is an example of an API throttle exception:
> ```
> An error occurred (TooManyRequestsException) when calling the DescribeJobs
> operation (reached max retries: 4): Too Many Requests
> ```
> This exception should be handled while waiting for a job to complete, it must
> not result in a job-retry.
> Reduced polling rates help
> (https://issues.apache.org/jira/browse/AIRFLOW-5218), but additional
> exception handling in the polling function is required. Within the exception
> handling code, a random pause on the polling routine could help to alleviate
> the API throttle limits. Maybe the class could expose a parameter for the
> rate of polling (or a callable)?
> Another consideration is possible use of something like the sensor-poke
> approach, with rescheduling, so that the polling process does not occupy a
> worker for the full duration of a batch job, e.g.
> -
> [https://github.com/apache/airflow/blob/master/airflow/sensors/base_sensor_operator.py#L117]
> If a rescheduling approach is adopted, the similar API throttle
> considerations apply.
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