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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3411) Balancer fails to balance blocks between aboveAvgUtilized and belowAvgUtilized datanodes.
Date Sat, 12 May 2012 15:20:48 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3411?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uma Maheswara Rao G updated HDFS-3411:
--------------------------------------

    Target Version/s: 2.0.0, 3.0.0
       Fix Version/s:     (was: 3.0.0)
                          (was: 2.0.0)

Please use target versions instead of fix version while rasing the bug. Fix versions will
be updated once it committed and resolved.
                
> Balancer fails to balance blocks between aboveAvgUtilized and belowAvgUtilized datanodes.
> -----------------------------------------------------------------------------------------
>
>                 Key: HDFS-3411
>                 URL: https://issues.apache.org/jira/browse/HDFS-3411
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer
>    Affects Versions: 0.23.0
>            Reporter: Ashish Singhi
>
> Scaenario:
> replication set to 1.
> 1. Start 1NN and IDN
> 2. pump 1GB of data.
> 3. Start one more DN
> 4. Run balancer with threshold 1.
> Now DN1 is added into aboveAvgUtilizedDatanodes and DN2 into belowAvgUtilizedDatanodes.
Hence overLoadedBytes and underLoadedBytes will be equal to 0. Resulting in bytesLeftToMove
equal to 0. Thus balancer will exit without balancing the blocks.

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