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https://issues.apache.org/jira/browse/HDFS-8995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15019107#comment-15019107
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Sangjin Lee commented on HDFS-8995:
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Does this issue exist in 2.6.x? Should this be backported to branch-2.6?
> Flaw in registration bookeeping can make DN die on reconnect
> ------------------------------------------------------------
>
> Key: HDFS-8995
> URL: https://issues.apache.org/jira/browse/HDFS-8995
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
> Priority: Critical
> Fix For: 2.7.2
>
> Attachments: HDFS-8995.patch
>
>
> Normally data nodes re-register with the namenode when it was unreachable for
> more than the heartbeat expiration and becomes reachable again. Datanodes
> keep retrying the last rpc call such as incremental block report and
> heartbeat and when it finally gets through the namenode tells it to
> re-register.
> We have observed that some of datanodes stay dead in such scenarios. Further
> investigation has revealed that those were told to shutdown by the namenode.
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