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Date: Fri, 3 Jun 2011 23:48:52 +0000 (UTC)
From: "Jonathan Ellis (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (CASSANDRA-2654) Work around native heap leak in
 sun.nio.ch.Util affecting IncomingTcpConnection
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     [ https://issues.apache.org/jira/browse/CASSANDRA-2654?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis updated CASSANDRA-2654:
--------------------------------------

    Affects Version/s:     (was: 0.8.0 beta 2)
                           (was: 0.7.5)
                           (was: 0.6.13)
        Fix Version/s:     (was: 0.6.12)
                       0.8.1
                       0.7.7

> 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
>         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: 0.7.7, 0.8.1
>
>         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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