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https://issues.apache.org/jira/browse/HDFS-4591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13600392#comment-13600392
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Aaron T. Myers commented on HDFS-4591:
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The TestDataDirs test failure is already known and is tracked by HDFS-4586.
> 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
> Attachments: HDFS-4591.patch, HDFS-4591.patch
>
>
> 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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