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From "Lin Yiqun (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9303) Balancer slowly with too many small file blocks
Date Thu, 29 Oct 2015 01:18:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14979621#comment-14979621

Lin Yiqun commented on HDFS-9303:

Thanks [~szetszwo] review, you said is right.Maybe I can improve balancer performance with
other ways,to be honest, when the cluster is large enough, it's still not very fast as I expect
for balance.

> Balancer slowly with too many small file blocks
> -----------------------------------------------
>                 Key: HDFS-9303
>                 URL: https://issues.apache.org/jira/browse/HDFS-9303
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: balancer & mover
>    Affects Versions: 2.7.1
>            Reporter: Lin Yiqun
>            Assignee: Lin Yiqun
>         Attachments: HDFS-9303.001.patch, HDFS-9303.002.patch
> In the recent hadoop release versions I found that balance operation is always so slowly,
even though I upgrade the version.When I analyse balancer log, I found that in every balance
iteration,it use only 4 to 5 minutes, and is a short time.And The most important is that the
most of being moving blocks is small blocks ,and the size is smaller than 1M.And this is a
main reason of the low effective of balance operation.

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