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https://issues.apache.org/jira/browse/HDFS-3261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13252248#comment-13252248
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Aaron T. Myers commented on HDFS-3261:
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+1, good sleuthing.
> TestHASafeMode fails on HDFS-3042 branch
> ----------------------------------------
>
> Key: HDFS-3261
> URL: https://issues.apache.org/jira/browse/HDFS-3261
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Affects Versions: Auto failover (HDFS-3042)
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Trivial
> Attachments: hdfs-3261.txt
>
>
> TestHASafeMode started failing on the HDFS-3042 branch after the commit of
> HADOOP-8247. The reason is that testEnterSafeModeInANNShouldNotThrowNPE
> restarts the active node, and then tries to make an RPC to it right after
> restarting. The RPC picks up a cached connection to the old (restarted) NN,
> which causes an EOFException. This was just due to a test change that was
> made in HADOOP-8247, not due to any change made by the actual patch.
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