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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AIRFLOW-1166) _change_state_for_tis_without_dagrun can take very long and end up in deadlocks
Date Wed, 07 Jun 2017 07:17:18 GMT

    [ https://issues.apache.org/jira/browse/AIRFLOW-1166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16040371#comment-16040371
] 

ASF subversion and git services commented on AIRFLOW-1166:
----------------------------------------------------------

Commit 4764646b18f56c34a35c19bd20a1931eb3a844fe in incubator-airflow's branch refs/heads/master
from [~bolke]
[ https://git-wip-us.apache.org/repos/asf?p=incubator-airflow.git;h=4764646 ]

[AIRFLOW-1166] Speed up _change_state_for_tis_without_dagrun

_change_state_for_tis_without_dagrun was locking a
significant
amount of tasks uncessarily. This could end up in
a deadlock
in the database due to the time the lock stood.

Closes #2267 from bolkedebruin/fix_deadlock


> _change_state_for_tis_without_dagrun can take very long and end up in deadlocks
> -------------------------------------------------------------------------------
>
>                 Key: AIRFLOW-1166
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1166
>             Project: Apache Airflow
>          Issue Type: Bug
>    Affects Versions: 1.8.1
>            Reporter: Bolke de Bruin
>            Assignee: Bolke de Bruin
>              Labels: scheduler
>             Fix For: 1.8.2
>
>
> While testing multi-scheduler setups we've seen some serious delays (>8s, with just
one dag running) in _change_state_for_tis_without_dagrun. This can also result in deadlocks
in the db due to the fact the query in _change_state_for_tis_without_dagrun is locking a significant
amount of task instances. This is unnecessary.



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