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https://issues.apache.org/jira/browse/AIRFLOW-1569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16601535#comment-16601535
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Apache Spark commented on AIRFLOW-1569:
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User 'saguziel' has created a pull request for this issue:
https://github.com/apache/incubator-airflow/pull/2569
> Requeue Celery tasks in RESERVED state
> --------------------------------------
>
> Key: AIRFLOW-1569
> URL: https://issues.apache.org/jira/browse/AIRFLOW-1569
> Project: Apache Airflow
> Issue Type: Bug
> Reporter: Alex Guziel
> Assignee: Alex Guziel
> Priority: Major
>
> Right now, "fair" scheduling in Celery doesn't quite work (some tasks get
> RESERVED, which means they will get blocked from execution even if there are
> open slots). We should requeue them after 2 heartbeats.
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