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https://issues.apache.org/jira/browse/HADOOP-1130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12484749
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Philippe Gassmann commented on HADOOP-1130:
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The closeAll() method should also remove ClientFinalizer from shutdown hooks to
avoid the ClassLoader (so all Class(es) loaded by the ClassLoader) that have
loaded hadoop being kept in memory.
> Remove unused ClientFinalizer in DFSClient
> ------------------------------------------
>
> Key: HADOOP-1130
> URL: https://issues.apache.org/jira/browse/HADOOP-1130
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.10.1, 0.11.0, 0.11.1, 0.11.2, 0.12.0
> Reporter: Philippe Gassmann
> Priority: Critical
> Attachments: HADOOP-1130.diff
>
>
> The ClientFinalizer shutdown hook is not used.
> This can lead to severe memory leaks if you use the DFSClient in a dynamic
> class loading context (such as in a webapp) as the DFSClient.ClientFinalizer
> class is retained in the memory by the shutdown hook. It retains also the
> current ClassLoader and thus all classes loaded by the ClassLoader. (Threads
> put in the shutdown hook are never garbage collected).
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