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https://issues.apache.org/jira/browse/FLINK-25277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17481432#comment-17481432
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Niklas Semmler commented on FLINK-25277:
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[~chesnay] Yes, you are right. [~trohrmann] needed the shutdown hook for a
different use case, so he included the code already in
dd6069fabf8a7ff65fbd9ff8dd7b0c47f492288f. When I saw this, I removed it from
the commits above to avoid merge conflicts.
Also, I just want to stress, the shutdown code was really just the icing on the
cake. All the signaling functionality was already implemented, but was just not
called during shutdown.
> Introduce explicit shutdown signalling between TaskManager and JobManager
> --------------------------------------------------------------------------
>
> Key: FLINK-25277
> URL: https://issues.apache.org/jira/browse/FLINK-25277
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Coordination
> Affects Versions: 1.13.0, 1.14.0
> Reporter: Niklas Semmler
> Assignee: Niklas Semmler
> Priority: Major
> Labels: pull-request-available, reactive
> Fix For: 1.15.0
>
> Original Estimate: 504h
> Remaining Estimate: 504h
>
> We need to introduce shutdown signalling between TaskManager and JobManager
> for fast & graceful shutdown in reactive scheduler mode.
> In Flink 1.14 and earlier versions, the JobManager tracks the availability of
> a TaskManager using a hearbeat. This heartbeat is by default configured with
> an interval of 10 seconds and a timeout of 50 seconds [1]. Hence, the
> shutdown of a TaskManager is recognized only after about 50-60 seconds. This
> works fine for the static scheduling mode, where a TaskManager only
> disappears as part of a cluster shutdown or a job failure. However, in the
> reactive scheduler mode (FLINK-10407), TaskManagers are regularly added and
> removed from a running job. Here, the heartbeat-mechanisms incurs additional
> delays.
> To remove these delays, we add an explicit shutdown signal from the
> TaskManager to the JobManager.
>
> [1]https://nightlies.apache.org/flink/flink-docs-master/docs/deployment/config/#heartbeat-timeout
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