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From "Aaron T. Myers (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3256) HDFS considers blocks under-replicated if topology script is configured with only 1 rack
Date Thu, 12 Apr 2012 21:33:18 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3256?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aaron T. Myers updated HDFS-3256:
---------------------------------

       Resolution: Fixed
    Fix Version/s: 2.0.0
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

Thanks a lot for the reviews, Todd and Tom. I've just committed this to trunk and branch-2.
                
> HDFS considers blocks under-replicated if topology script is configured with only 1 rack
> ----------------------------------------------------------------------------------------
>
>                 Key: HDFS-3256
>                 URL: https://issues.apache.org/jira/browse/HDFS-3256
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.0.0
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>             Fix For: 2.0.0
>
>         Attachments: HDFS-3256.patch, HDFS-3256.patch, HDFS-3256.patch, HDFS-3256.patch,
HDFS-3256.patch, HDFS-3256.patch
>
>
> HDFS treats the mere presence of a topology script being configured as evidence that
there are multiple racks. If there is in fact only a single rack, the NN will try to place
the blocks on at least two racks, and thus blocks will be considered to be under-replicated.

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