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https://issues.apache.org/jira/browse/HDFS-8675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14607871#comment-14607871
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Vinayakumar B commented on HDFS-8675:
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IMO, For the deadnode case, analysis of [~walter.k.su] seems reasonable.
But if, some other Exception (ex: NPE) which repeatedly comes for every
blockreport ( may be until restart of NN), will be a problem.
> IBRs from dead DNs go into infinite loop
> ----------------------------------------
>
> Key: HDFS-8675
> URL: https://issues.apache.org/jira/browse/HDFS-8675
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.6.0
> Reporter: Daryn Sharp
>
> If the DN sends an IBR after the NN declares it dead, the NN returns an IOE
> of unregistered or dead. The DN catches the IOE, ignores it, and infinitely
> loops spamming the NN with retries.
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