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https://issues.apache.org/jira/browse/CASSANDRA-15306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17061961#comment-17061961
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David Capwell commented on CASSANDRA-15306:
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[~jolynch] can you define "light traffic"? if you are doing something like 10
qps and you see this then something is very off. If you are doing 1000 qps per
node then this may be expected?
All my tests filter for WARN/ERROR so don't have history to say if I see this
with my tests.
> Investigate why we are allocating 8MiB chunks and reaching the maximum
> BufferPool size
> --------------------------------------------------------------------------------------
>
> Key: CASSANDRA-15306
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15306
> Project: Cassandra
> Issue Type: Bug
> Components: Observability/Logging, Test/benchmark
> Reporter: Joey Lynch
> Priority: Normal
> Fix For: 4.0-beta
>
>
> While throwing some light traffic at {{4.0-alpha1}} I saw a lot of the
> following in the logs
> {noformat}
> INFO [CompactionExecutor:8] 2019-09-06 11:40:31,419 NoSpamLogger.java:91 -
> Maximum memory usage reached (512.000MiB), cannot allocate chunk of 8.000MiB
> INFO [CompactionExecutor:8] 2019-09-06 11:55:31,419 NoSpamLogger.java:91 -
> Maximum memory usage reached (512.000MiB), cannot allocate chunk of 8.000MiB
> INFO [CompactionExecutor:15] 2019-09-06 12:10:31,419 NoSpamLogger.java:91 -
> Maximum memory usage reached (512.000MiB), cannot allocate chunk of 8.000MiB
> INFO [CompactionExecutor:18] 2019-09-06 12:25:31,421 NoSpamLogger.java:91 -
> Maximum memory usage reached (512.000MiB), cannot allocate chunk of 8.000MiB
> {noformat}
> This was with about 150 WPS against a LCS table containing 4kib partitions.
> It seemed that compaction proceeded just fine but I don't remember seeing
> this in previous testing runs and I'd like to make sure it's not a bug
> (otherwise we may want to reduce the logging).
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