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From "Mukul Kumar Singh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11830) Ozone: Datanode needs to re-register to SCM if SCM is restarted
Date Thu, 18 May 2017 16:45:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16016052#comment-16016052
] 

Mukul Kumar Singh commented on HDFS-11830:
------------------------------------------

Thanks for the second patch [~cheersyang]

1) Sure, we can ignore the register command, Can we log this as an error ? This might help
in debugging issues later.
2) nit, SCMNodeManager.java:141, there is an extra space between {
3) Should ReregisterCommand should extend SCMReregisterCmdResponseProto ?

> 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
>
>
> 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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