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https://issues.apache.org/jira/browse/AIRFLOW-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16701772#comment-16701772
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Ash Berlin-Taylor commented on AIRFLOW-3405:
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1.10.0 - https://issues.apache.org/jira/browse/AIRFLOW-1559 was the issue I was
thinking of
> Task instance fail intermittently due to MySQL error
> ----------------------------------------------------
>
> Key: AIRFLOW-3405
> URL: https://issues.apache.org/jira/browse/AIRFLOW-3405
> Project: Apache Airflow
> Issue Type: Improvement
> Environment: MySQL, Redhat Linux
> Reporter: Yuvaraj
> Priority: Major
> Labels: performance, usability
>
> Dags are getting failed intermittently due to below error.
> OperationalError: (_mysql_exceptions.OperationalError) (1040, 'Too many
> connections')
> [2018-11-25 12:24:16,952] - Heartbeat time limited exceeded!
> We have max_connections defined as 2000 in DB.
> Below are the setting in cfg.
> sql_alchemy_pool_size = 1980
> sql_alchemy_pool_recycle = 3600
> As per DBA, The airflow scheduler keeps opening connections to the database,
> these connections are mostly idle, they get reset whenever the scheduler
> restarts but with max_connections at 2000 and scheduler holding on to 1600 of
> these, other apps trying to connect might start running out of connections.
> How do we remediate these idle connections. What should be the optimal value
> for these configs and max_connections that to be set at DB. Consider we need
> to build a large environment serving 500+ definitions with 10000+ runs per
> day. Need suggestions...
>
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