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https://issues.apache.org/jira/browse/CASSANDRA-16430?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brandon Williams updated CASSANDRA-16430:
-----------------------------------------
Resolution: Invalid
Status: Resolved (was: Open)
I'm not sure where this warning is coming from, since C* does not even monitor
this, but as it states, this is a java memory pool. JVM tuning is generally
outside the scope of the project - but I will note this memory pool
specifically is not something that has historically needed tuning.
The debug log messages are just that - debug information.
> Cassandra JVM Memory Pools -Par Survivor Space UsedPoolMemory
> -------------------------------------------------------------
>
> Key: CASSANDRA-16430
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16430
> Project: Cassandra
> Issue Type: Task
> Components: Local/Config, Observability/Metrics
> Reporter: sharanya
> Priority: Urgent
>
> I have a 9 node cluster of cassandra, with 2gb of data on each node in our
> production environment. We are continuously facing below warnings from one of
> our monitoring tool, but there is no suspicious error from system.log file.
> Also there is sufficient memory available for Heap/server.
>
> warn - Cassandra JVM Memory Pools -Par Survivor Space UsedPoolMemory
> Datasource: Cassandra JVM Memory Pools -Par Survivor Space
> Datapoint: UsedPoolMemory
> Level: warn
> Start: 2021-02-08 10:11:17 GMT
> Duration: 1h 0m
> Value: 100.0
> ClearValue: 1.3631
> Reason: UsedPoolMemory is not >= 90: the current value is 1.3631
> The java memory pool Par Survivor Space on esg3-c-cassv3-03p is now using
> 100.0 % of the maximum.
>
> We see the below message in debug.log file.
> 2021-02-08 08:43:51,310 INFO [ReadStage-1] NoSpamLogger.java:91 - Maximum
> memory usage reached (512.000MiB), cannot allocate chunk of 1.000MiB
> 2021-02-08 08:47:28,344 DEBUG [COMMIT-LOG-ALLOCATOR]
> AbstractCommitLogSegmentManager.java:109 - No segments in reserve; creating a
> fresh one
>
>
> Please help us to fix this issue ASAP.
>
>
>
> Thanks!
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