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From "Robert Stupp (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-13033) Thread local pools never cleaned up
Date Mon, 12 Dec 2016 19:50:58 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-13033?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Stupp updated CASSANDRA-13033:
-------------------------------------
       Resolution: Fixed
    Fix Version/s:     (was: 3.0.x)
                   3.10
                   3.0.11
           Status: Resolved  (was: Patch Available)

Thanks for the prompt review!

CI looks good - no failures related to this patch.

Added the comment and committed it as [7f668c6fe117f892cd79863fb9805ea5d5a2823c|https://github.com/apache/cassandra/commit/7f668c6fe117f892cd79863fb9805ea5d5a2823c]
to [cassandra-3.0|https://github.com/apache/cassandra/tree/cassandra-3.0] and merged it up
to trunk. 


> 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: 3.0.11, 3.10
>
>
> 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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