Aaron T. Myers created HDFS-4591:
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Summary: HA clients can fail to fail over while Standby NN is
performing long checkpoint
Key: HDFS-4591
URL: https://issues.apache.org/jira/browse/HDFS-4591
Project: Hadoop HDFS
Issue Type: Bug
Components: ha, namenode
Affects Versions: 2.0.4-alpha
Reporter: Aaron T. Myers
Assignee: Aaron T. Myers
Clients know to fail over to talk to the Active NN when they perform an RPC to
the Standby NN and it throws a StandbyException. However, most places in the
code that check if the NN is in the standby state do so inside the FSNS fsLock.
Since this lock is held for the duration of the saveNamespace during a
checkpoint, StandbyExceptions will not be thrown during this time.
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