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Date: Tue, 28 Dec 2010 14:16:47 -0500 (EST)
From: "dhruba borthakur (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Updated: (HDFS-1391) Exiting safemode takes a long time when
 there are lots of blocks in the HDFS
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     [ https://issues.apache.org/jira/browse/HDFS-1391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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

    Status: Patch Available  (was: Open)

> 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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