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https://issues.apache.org/jira/browse/HDFS-4832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ravi Prakash updated HDFS-4832:
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Summary: Namenode doesn't change the number of missing blocks in safemode
when DNs rejoin or leave (was: Namenode doesn't change the number of missing
blocks in safemode when DNs rejoin)
> 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
>
>
> 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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