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https://issues.apache.org/jira/browse/HADOOP-11105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chuan Liu updated HADOOP-11105:
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Status: Patch Available (was: Open)
> 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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