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From "Ash Berlin-Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AIRFLOW-3405) Task instance fail intermittently due to MySQL error
Date Wed, 28 Nov 2018 11:58:00 GMT

    [ https://issues.apache.org/jira/browse/AIRFLOW-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16701772#comment-16701772
] 

Ash Berlin-Taylor commented on AIRFLOW-3405:
--------------------------------------------

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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