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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4832) Namenode doesn't change the number of missing blocks in safemode when DNs rejoin or leave
Date Fri, 07 Jun 2013 20:00:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13678369#comment-13678369
] 

Kihwal Lee commented on HDFS-4832:
----------------------------------

+1 the patch looks good.
                
> Namenode doesn't change the number of missing blocks in safemode when DNs rejoin or leave
> -----------------------------------------------------------------------------------------
>
>                 Key: HDFS-4832
>                 URL: https://issues.apache.org/jira/browse/HDFS-4832
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 3.0.0, 0.23.7, 2.1.0-beta
>            Reporter: Ravi Prakash
>            Assignee: Ravi Prakash
>            Priority: Critical
>         Attachments: HDFS-4832.branch-0.23.patch, HDFS-4832.patch, HDFS-4832.patch, HDFS-4832.patch,
HDFS-4832.patch, HDFS-4832.patch, HDFS-4832.patch
>
>
> Courtesy Karri VRK Reddy!
> {quote}
> 1. Namenode lost datanodes causing missing blocks
> 2. Namenode was put in safe mode
> 3. Datanode restarted on dead nodes 
> 4. Waited for lots of time for the NN UI to reflect the recovered blocks.
> 5. Forced NN out of safe mode and suddenly,  no more missing blocks anymore.
> {quote}
> I was able to replicate this on 0.23 and trunk. I set dfs.namenode.heartbeat.recheck-interval
to 1 and killed the DN to simulate "lost" datanode. The opposite case also has problems (i.e.
Datanode failing when NN is in safemode, doesn't lead to a missing blocks message)
> Without the NN updating this list of missing blocks, the grid admins will not know when
to take the cluster out of safemode.

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