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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-15) All replicas of a block end up on only 1 rack
Date Tue, 01 Sep 2009 14:41:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-15?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12749926#action_12749926
] 

Hudson commented on HDFS-15:
----------------------------

Integrated in Hadoop-Hdfs-trunk #69 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-Hdfs-trunk/69/])
    

> All replicas of a block end up on only 1 rack
> ---------------------------------------------
>
>                 Key: HDFS-15
>                 URL: https://issues.apache.org/jira/browse/HDFS-15
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Hairong Kuang
>            Assignee: Jitendra Nath Pandey
>            Priority: Critical
>             Fix For: 0.21.0
>
>         Attachments: HDFS-15.4.patch, HDFS-15.5.patch, HDFS-15.6.patch, HDFS-15.patch,
HDFS-15.patch.2, HDFS-15.patch.3
>
>
> HDFS replicas placement strategy guarantees that the replicas of a block exist on at
least two racks when its replication factor is greater than one. But fsck still reports that
the replicas of some blocks  end up on one rack.
> The cause of the problem is that decommission and corruption handling only check the
block's replication factor but not the rack requirement. When an over-replicated block loses
a replica due to decomission, corruption, or heartbeat lost, namenode does not take any action
to guarantee that remaining replicas are on different racks.
>  

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