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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8826) Balancer may not move blocks efficiently in some cases
Date Tue, 18 Aug 2015 01:32:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14700575#comment-14700575
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Arpit Agarwal commented on HDFS-8826:
-------------------------------------

+1 for the patch. The test failures look unrelated although couple of the checkstyle issues
look valid.

> Balancer may not move blocks efficiently in some cases
> ------------------------------------------------------
>
>                 Key: HDFS-8826
>                 URL: https://issues.apache.org/jira/browse/HDFS-8826
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: balancer & mover
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: h8826_20150811.patch, h8826_20150816.patch
>
>
> Balancer is inefficient in the following case:
> || Datanode || Utilization || Rack ||
> | D1 | 95% | A |
> | D2 | 30% | B |
> | D3, D4, D5 | 0% | B |
> The average utilization is 25% so that D2 is within 10% threshold.  However, Balancer
currently will first move blocks from D2 to D3, D4 and D5 since they are under the same rack.
 Then, it will move blocks from D1.



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