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From "Ravi Prakash (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 Sat, 25 May 2013 23:07:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13667170#comment-13667170
] 

Ravi Prakash commented on HDFS-4832:
------------------------------------

Thanks for the review Konstantin. Yes. I agree. This is why I have put this in the DatanodeManager
to make sure that none of the replication /deletion work is sent back the the DNs.

{code}
+        // If we are in safemode, do not send back any recovery / replication
+        // requests
+        if(namesystem.isInSafeMode()) {
+          return new DatanodeCommand[0];
+        }
{code}
                
> 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, 2.0.5-beta
>            Reporter: Ravi Prakash
>            Assignee: Ravi Prakash
>            Priority: Critical
>         Attachments: 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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