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https://issues.apache.org/jira/browse/CASSANDRA-15306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17061462#comment-17061462
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ZhaoYang commented on CASSANDRA-15306:
--------------------------------------
8MB is the size of macro chunk in global buffer pool... Should we close this
ticket?
> 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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