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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9761) Rebalancer sleeps too long between iterations
Date Fri, 05 Feb 2016 00:11:39 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9761?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Nauroth updated HDFS-9761:
--------------------------------
        Assignee: Mingliang Liu
    Hadoop Flags: Reviewed

+1 for the patch, pending pre-commit.

> 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
>         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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