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https://issues.apache.org/jira/browse/CASSANDRA-13033?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Brown updated CASSANDRA-13033:
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Reviewer: Jason Brown
> Thread local pools never cleaned up
> -----------------------------------
>
> Key: CASSANDRA-13033
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13033
> Project: Cassandra
> Issue Type: Bug
> Reporter: Robert Stupp
> Assignee: Robert Stupp
> Fix For: 3.0.x
>
>
> Netty 4.x uses {{(Fast)ThreadLocal}} instances to provide a pool of (direct)
> buffers per thread
> ({{io.netty.buffer.PooledByteBufAllocator.PoolThreadLocalCache}}. However,
> these per-thread pools need to be cleaned up when a thread terminates
> ({{FastThreadLocal.removeAll()}}) - which is missing.
> Although the possibility that such per-thread pools ever _need_ to be cleaned
> up, since we rarely terminate threads, it still may actually happen and
> manifest in a late and hard to detect out-of-memory situation. One
> possibility to raise such a scenario is to regularly stop and restart the
> native protocol service.
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