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Posted to common-issues@hadoop.apache.org by "Chuan Liu (JIRA)" <ji...@apache.org> on 2014/09/18 19:50:35 UTC

[jira] [Created] (HADOOP-11105) MetricsSystemImpl could leak memory in registered callbacks

Chuan Liu created HADOOP-11105:
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             Summary: 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


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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