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https://issues.apache.org/jira/browse/HDFS-11830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16016925#comment-16016925
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Weiwei Yang commented on HDFS-11830:
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Hi [~msingh]
Thanks. I will fix the checkstyle issue shortly in next patch.
> Ozone: Datanode needs to re-register to SCM if SCM is restarted
> ---------------------------------------------------------------
>
> Key: HDFS-11830
> URL: https://issues.apache.org/jira/browse/HDFS-11830
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
> Reporter: Weiwei Yang
> Assignee: Weiwei Yang
> Priority: Critical
> Attachments: HDFS-11830-HDFS-7240.001.patch,
> HDFS-11830-HDFS-7240.002.patch, HDFS-11830-HDFS-7240.003.patch
>
>
> Problem description:
> # Start NN, DN, SCM
> # Restart SCM and will see following warnings in SCM log
> 17/05/02 00:47:08 WARN node.SCMNodeManager: SCM receive heartbeat from
> unregistered datanode
> Datanode could not re-establish communication with SCM afterwards. Propose to
> fix this by adding a new command in HB handling telling datanode to
> re-register with SCM. Datanode once received this command transits to
> REGISTER state again to proceed.
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