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From "Matt Foley (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1391) Exiting safemode takes a long time when there are lots of blocks in the HDFS
Date Tue, 05 Jul 2011 23:08:17 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matt Foley updated HDFS-1391:
-----------------------------

    Issue Type: Sub-task  (was: Bug)
        Parent: HDFS-2126

> 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: Sub-task
>          Components: name-node
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: 1391_excessReplicas5_comments.txt, excessReplicas.1_trunk.txt, excessReplicas2.txt,
excessReplicas3.txt, excessReplicas5.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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