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https://issues.apache.org/jira/browse/FLINK-27420?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Anderson updated FLINK-27420:
-----------------------------------
Summary: Suspended SlotManager fails to re-register metrics when started
again (was: Suspended SlotManager fail to reregister metrics when started
again)
> Suspended SlotManager fails to re-register metrics when started again
> ---------------------------------------------------------------------
>
> Key: FLINK-27420
> URL: https://issues.apache.org/jira/browse/FLINK-27420
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Coordination, Runtime / Metrics
> Affects Versions: 1.13.5
> Reporter: Ben Augarten
> Assignee: Ben Augarten
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.16.0, 1.15.1
>
>
> The symptom is that SlotManager metrics are missing (taskslotsavailable and
> taskslotstotal) when a SlotManager is suspended and then restarted. We
> noticed this issue when running 1.13.5, but I believe this impacts 1.14.x,
> 1.15.x, and master.
>
> When a SlotManager is suspended, the [metrics group is
> closed|https://github.com/apache/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/DeclarativeSlotManager.java#L214].
> When the SlotManager is [started
> again|https://github.com/apache/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/DeclarativeSlotManager.java#L181],
> it makes an attempt to [reregister
> metrics|[https://github.com/apache/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/DeclarativeSlotManager.java#L199-L202],]
> but that fails because the underlying metrics group [is still
> closed|https://github.com/apache/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/metrics/groups/AbstractMetricGroup.java#L393]
>
>
> I was able to trace through this issue by restarting zookeeper nodes in a
> staging environment and watching the JM with a debugger.
>
> A concise test, which currently fails, shows the expected behavior –
> [https://github.com/apache/flink/compare/master...baugarten:baugarten/slot-manager-missing-metrics?expand=1]
>
> I am happy to provide a PR to fix this issue, but first would like to verify
> that this is not intended.
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