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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-15) Rack replication policy can be violated for over replicated blocks
Date Wed, 29 Dec 2010 23:59:51 GMT

     [ https://issues.apache.org/jira/browse/HDFS-15?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eli Collins updated HDFS-15:
----------------------------

    Summary: Rack replication policy can be violated for over replicated blocks   (was: All
replicas of a block end up on only 1 rack)

> Rack replication policy can be violated for over replicated blocks 
> -------------------------------------------------------------------
>
>                 Key: HDFS-15
>                 URL: https://issues.apache.org/jira/browse/HDFS-15
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 0.20.3
>            Reporter: Hairong Kuang
>            Assignee: Jitendra Nath Pandey
>            Priority: Critical
>             Fix For: 0.20.3, 0.21.0
>
>         Attachments: hdfs-15-b20-1.patch, 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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