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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-3411) Balancer fails to balance blocks between aboveAvgUtilized and belowAvgUtilized datanodes.
Date Tue, 28 Jul 2015 00:40:05 GMT

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

Tsz Wo Nicholas Sze resolved HDFS-3411.
---------------------------------------
    Resolution: Not A Problem

Resolving as not-a-problem.  Please feel free to reopen if you disagree.

> 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 & mover
>    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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