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https://issues.apache.org/jira/browse/AIRFLOW-5642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16952875#comment-16952875
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chen xianxin commented on AIRFLOW-5642:
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max_tis_per_query seems to only work in here
[https://github.com/apache/airflow/blob/v1-10-stable/airflow/jobs/scheduler_job.py#L1172-L1183,]
if executor.queued_tasks has too many tasks were not executed,
sqlalchemy.exc.OperationalError will occur
> sqlalchemy.exc.OperationalError happens when sql is too long, which cause
> scheduler processor will be exited
> ------------------------------------------------------------------------------------------------------------
>
> Key: AIRFLOW-5642
> URL: https://issues.apache.org/jira/browse/AIRFLOW-5642
> Project: Apache Airflow
> Issue Type: Bug
> Components: scheduler
> Affects Versions: 1.10.5
> Reporter: chen xianxin
> Priority: Minor
>
> h2. code
> https://github.com/apache/airflow/blob/v1-10-stable/airflow/jobs/scheduler_job.py#L1060-L1069
> h2. Error description
> {{if there is too many queued_tasks, sqlalchemy.exc.OperationalError will
> occur. details are as follow:}}
> {{<}}
> {{sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (2006,
> "MySQL server has gone away (BrokenPipeError(32, 'Broken pipe'))")}}
> [SQL: SELECT ...]
> (Background on this error at: [http://sqlalche.me/e/e3q8])
> {{> }}
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