DelegationTokenSecretManager lifecycle is inconsistent
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Key: HDFS-967
URL: https://issues.apache.org/jira/browse/HDFS-967
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 0.22.0
Reporter: Todd Lipcon
Attachments: hdfs-967.txt
FSNamesystem.dtSecretManager is initialized in FSNamesystem.initialize(), but
not started until activate(). In FSN.stop() it calls
dtSecretManager.stopThreads so long as it's non-null, but doesn't check that
the threads have started (ie activate() may never have been called). This
causes an NPE in stopThreads()
To fix this, stopThreads should check tokenRemoverThread against null before
interrupting it.
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