Kihwal Lee created HDFS-3718:
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Summary: Datanode won't shutdown because of runaway
DataBlockScanner thread
Key: HDFS-3718
URL: https://issues.apache.org/jira/browse/HDFS-3718
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node
Affects Versions: 2.0.1-alpha
Reporter: Kihwal Lee
Priority: Critical
Fix For: 3.0.0, 2.2.0-alpha
Datanode sometimes does not shutdown because the block pool scanner thread
keeps running. It prints out "Starting a new period" every five seconds, even
after {{shutdown()}} is called. Somehow the interrupt is missed.
{{DataBlockScanner}} will also terminate if {{datanode.shouldRun}} is false,
but in {{DataNode#shutdown}}, {{DataBlockScanner#shutdown()}} is invoked before
it is being set to false.
Is there any reason why {{datanode.shouldRun}} is set to false later?
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