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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11105) MetricsSystemImpl could leak memory in registered callbacks
Date Fri, 19 Sep 2014 11:34:39 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14140338#comment-14140338

Hudson commented on HADOOP-11105:

SUCCESS: Integrated in Hadoop-Yarn-trunk #685 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/685/])
HADOOP-11105. MetricsSystemImpl could leak memory in registered callbacks. Contributed by
Chuan Liu. (cnauroth: rev 1942364ef14396e9bd94a87c0d901ff9abe1d42a)
* hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/impl/MetricsSystemImpl.java
HADOOP-11105. Update CHANGES.txt. (cnauroth: rev 1b4b46004acca1fcb2c291933c1cd3f75e9918b3)
* hadoop-common-project/hadoop-common/CHANGES.txt

> MetricsSystemImpl could leak memory in registered callbacks
> -----------------------------------------------------------
>                 Key: HADOOP-11105
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11105
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 2.5.1
>            Reporter: Chuan Liu
>            Assignee: Chuan Liu
>             Fix For: 2.6.0
>         Attachments: HADOOP-11105.2.patch, HADOOP-11105.patch, memory_leak_1.png, memory_leak_2.png
> In {{MetricsSystemImpl.register(final String name, final String description, final T
sink)}} method, we will also add a callback function to the {{callbacks}} array list. However,
upon unregistering, the callback function is not removed from the list in existing code. As
a result, the memory allocated for the callback function could accumulate in the {{MetricsSystemImpl}}
list. In one of our cluster, we have seen a case where there are about 874 MB memory retained
by {{MetricsSystemImpl}}.

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