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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8995) Flaw in registration bookeeping can make DN die on reconnect
Date Fri, 06 Jan 2017 00:56:58 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8995?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Junping Du updated HDFS-8995:
    Fix Version/s: 2.8.0

> 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: 2.8.0, 2.7.2, 3.0.0-alpha1
>         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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