[jira] [Commented] (FLINK-27420) Suspended SlotManager fail to reregister metrics when started again

["Guowei Ma (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-27420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17528478#comment-17528478 ] 

Guowei Ma commented on FLINK-27420:
-----------------------------------

Thanks [~baugarten] for reporting this. cc [~xtsong] 

> Suspended SlotManager fail to reregister 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
>            Priority: Major
>
> 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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