AbstractDelegationTokenSecretManager.stopThreads() will NPE if called before
startThreads()
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Key: HADOOP-6565
URL: https://issues.apache.org/jira/browse/HADOOP-6565
Project: Hadoop Common
Issue Type: Bug
Components: security
Affects Versions: 0.22.0
Reporter: Steve Loughran
Priority: Minor
Looking at the code for starting/stopping SecretManagers, it seems to me that
{{AbstractDelegationTokenSecretManager.stopThreads()}} assumes that
{{tokenRemoverThread}} is never null. That assumption is only valid if
{{AbstractDelegationTokenSecretManager.startThreads()}} was called first.
the call to {{tokenRemoverThread.interrupt()}} should be guarded with a check
for {{tokenRemoverThread!=null}}
I haven't encountered this in the field yet, but it should be trivial to
replicate in a test and then fix.
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