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https://issues.apache.org/jira/browse/HDFS-1391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dhruba borthakur updated HDFS-1391:
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Attachment: excessReplicas3.txt
Addressed Todd's review comments. Todd: can you pl review it one more time,
really appreciate your time on this one.
> Exiting safemode takes a long time when there are lots of blocks in the HDFS
> ----------------------------------------------------------------------------
>
> Key: HDFS-1391
> URL: https://issues.apache.org/jira/browse/HDFS-1391
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Attachments: excessReplicas.1_trunk.txt, excessReplicas2.txt,
> excessReplicas3.txt
>
>
> When the namenode decides to exit safemode, it acquires the FSNamesystem
> lock and then iterates over all blocks in the blocksmap to determine if any
> block has any excess replicas. This call takes upwards of 5 minutes on a
> cluster that has 100 million blocks. This delays namenode restart to a good
> extent.
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