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From "Yi Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8995) Flaw in registration bookeeping can make DN die on reconnect
Date Wed, 02 Sep 2015 00:33:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14726485#comment-14726485
] 

Yi Liu commented on HDFS-8995:
------------------------------

+1, thanks Kihwal. Will commit it shortly.

> 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
>         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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