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From "shanyu zhao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-10839) Add unregisterSource() to MetricsSystem API
Date Tue, 15 Jul 2014 20:36:06 GMT
shanyu zhao created HADOOP-10839:

             Summary: Add unregisterSource() to MetricsSystem API
                 Key: HADOOP-10839
                 URL: https://issues.apache.org/jira/browse/HADOOP-10839
             Project: Hadoop Common
          Issue Type: Bug
          Components: metrics
    Affects Versions: 2.4.1
            Reporter: shanyu zhao
            Assignee: shanyu zhao

Currently the MetrisSystem API has register() method to register a MetricsSource but doesn't
have unregister() method. This means once a MetricsSource is registered with the MetricsSystem,
it will be there forever until the MetricsSystem is shut down. This in some cases can cause
Java OutOfMemoryError.

One such case is in file system metrics implementation. The new AbstractFileSystem/FileContext
framework does not implement a cache so every file system access can lead to the creation
of a NativeFileSystem instance. (refer to HADOOP-6356). And all these NativeFileSystem needs
to share the same instance of MetricsSystemImpl, which means we cannot shut down MetricsSystem
to clean up all the MetricsSources that has been registered but no longer active. Over time
the MetricsSource instance accumulates and eventually we saw OutOfMemoryError.

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