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https://issues.apache.org/jira/browse/AIRFLOW-1166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15993659#comment-15993659
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Bolke de Bruin commented on AIRFLOW-1166:
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[~saguziel] [~aoen] you probably want to be aware of this as it might turn up
in single scheduler setups as well and besides the delay is significant.
> _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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