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Posted to issues@flink.apache.org by "Ben Augarten (Jira)" <ji...@apache.org> on 2022/04/26 20:18:00 UTC
[jira] [Created] (FLINK-27420) Suspended SlotManagers fail to reregister metrics when started again
Ben Augarten created FLINK-27420:
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Summary: Suspended SlotManagers 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 / Metrics
Affects Versions: 1.13.5
Reporter: Ben Augarten
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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