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https://issues.apache.org/jira/browse/CASSANDRA-15306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17050724#comment-17050724
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David Capwell commented on CASSANDRA-15306:
-------------------------------------------
Given the fact this is compaction this wold most likely be
org.apache.cassandra.cache.ChunkCache I think.
org.apache.cassandra.utils.memory.BufferPool.LocalPool#get will attempt to grow
until this limit is reached and then will avoid using the pool and rely on GC
to cleanup buffers, currently buffers are heap but CASSANDRA-15358 wants to
switch to direct (needed by netty).
To replicate you can set file_cache_size_in_mb to a very small value, say 0 or
1 (never tried with such a value so may see other issues); this pool is shared
between internode networking and check cache
> 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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