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From "Thibaut (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2654) Work around native heap leak in sun.nio.ch.Util affecting IncomingTcpConnection
Date Fri, 27 May 2011 11:01:47 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13040183#comment-13040183
] 

Thibaut commented on CASSANDRA-2654:
------------------------------------

Tested this with 0.7.6 on our 100 node production cluster.

I'm only seeing occasional GC calls every few hours in the log, instead of a series of GC
calls which forced us to restart cassandra. The patch seems to help a lot.


> Work around native heap leak in sun.nio.ch.Util affecting IncomingTcpConnection
> -------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-2654
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2654
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.6.13, 0.7.5, 0.8.0 beta 2
>         Environment: OpenJDK Runtime Environment (IcedTea6 1.9.7) (6b20-1.9.7-0ubuntu1~10.04.1)
> OpenJDK 64-Bit Server VM (build 19.0-b09, mixed mode)
> Also observed on Sun/Oracle JDK. Probably platform- and os-independent.
>            Reporter: Hannes Schmidt
>             Fix For: 0.6.12
>
>         Attachments: 2654-v2.txt, 2654-v3.txt, 2654-v4-0.7.txt, 2654-v4.txt, chunking.diff
>
>
> NIO's leaky, per-thread caching of direct buffers in combination with IncomingTcpConnection's
eager buffering of messages leads to leakage of large amounts of native heap. Details in [1].
More on the root cause in [2]. Even though it doesn't fix the leak, attached patch has been
found to alleviate the problem by keeping the size of each direct buffer modest.

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