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From "Adrian Bridgett (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9761) Rebalancer sleeps too long between iterations
Date Mon, 08 Feb 2016 08:33:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15136699#comment-15136699
] 

Adrian Bridgett commented on HDFS-9761:
---------------------------------------

You're most welcome.  Really impressive JIRA/hudson setup - and especially how well and quickly
you all communicate. Awesome to see in action :-)

> 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
>
>         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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