Remove unused ClientFinalizer in DFSClient
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Key: HADOOP-1130
URL: https://issues.apache.org/jira/browse/HADOOP-1130
Project: Hadoop
Issue Type: Bug
Components: dfs
Affects Versions: 0.12.0, 0.11.2, 0.11.1, 0.11.0, 0.10.1
Reporter: Philippe Gassmann
Priority: Critical
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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