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From "Ravi Prakash (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4832) Namenode doesn't change the number of missing blocks in safemode when DNs rejoin
Date Thu, 16 May 2013 20:49:17 GMT
Ravi Prakash created HDFS-4832:
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             Summary: Namenode doesn't change the number of missing blocks in safemode when
DNs rejoin
                 Key: HDFS-4832
                 URL: https://issues.apache.org/jira/browse/HDFS-4832
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 0.23.7, 3.0.0, 2.0.5-beta
            Reporter: Ravi Prakash
            Assignee: Ravi Prakash
            Priority: Critical


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.

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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