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From "Chuan Liu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-11105) MetricsSystemImpl could leak memory in registered callbacks
Date Thu, 18 Sep 2014 18:13:34 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-11105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Chuan Liu updated HADOOP-11105:
    Attachment: HADOOP-11105.patch

Attaching a patch.

> 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
>    Affects Versions: 3.0.0
>            Reporter: Chuan Liu
>            Assignee: Chuan Liu
>         Attachments: 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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