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From "dhruba borthakur (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 Mon, 24 Jan 2011 04:22:45 GMT

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

dhruba borthakur updated HDFS-1391:
-----------------------------------

    Status: Open  (was: Patch Available)

Have to address todd's review comments.

> 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
>
>
> 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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