Kihwal Lee created HDFS-7533:
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Summary: Datanode sometimes does not shutdown on receiving upgrade
shutdown command
Key: HDFS-7533
URL: https://issues.apache.org/jira/browse/HDFS-7533
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Kihwal Lee
When datanode is told to shutdown via the dfsadmin command during rolling
upgrade, it may not shutdown. This is because not all writers have responder
running, but sendOOB() tries anyway. This causes NPE and the shutdown thread
dies, halting the shutdown after only shutting down DataXceiverServer.
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