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https://issues.apache.org/jira/browse/HDFS-9761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16351289#comment-16351289
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caixiaofeng commented on HDFS-9761:
-----------------------------------

Mark ,Good job.

> Rebalancer sleeps too long between iterations
> ---------------------------------------------
>
>                 Key: HDFS-9761
>                 URL: https://issues.apache.org/jira/browse/HDFS-9761
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer & mover
>            Reporter: Adrian Bridgett
>            Assignee: Mingliang Liu
>            Priority: Blocker
>             Fix For: 2.8.0, 3.0.0-alpha1
>
>         Attachments: HDFS-9761.000.patch
>
>
> Whilst reading the code to try and determine why I'm seeing bad performance I 
> think I've spotted an inadvertent move of a sleep() to inside a for loop.
> This means that instead of sleeping once per iteration the balance is 
> sleeping once per namenode per iteration.  If I've done my maths correctly 
> the sleep time default is 18seconds so this is a nice little speedup for HA 
> clusters.
> Commit d31a41c35927f02f2fb40d19380b5df4bb2b6d57 moved the sleep in 
> org/apache/hadoop/hdfs/server/balancer/Balancer.java:run()



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