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Date: Sun, 20 Mar 2011 02:44:29 +0000 (UTC)
From: "stack (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] Resolved: (HBASE-3422) Balancer will try to rebalance
 thousands of regions in one go; needs an upper bound added.
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     [ https://issues.apache.org/jira/browse/HBASE-3422?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack resolved HBASE-3422.
--------------------------

       Resolution: Fixed
    Fix Version/s: 0.92.0
     Hadoop Flags: [Reviewed]

Lets try it Ted.  On commit I added in being able to set in config. an explicit limit on how long balancer would run but that default is that this is not specified.  I also added logging (DEBUG) for when balancer is cutoff because it ran out of time.

Thanks for the patch Ted.  Committed to TRUNK.

> Balancer will try to rebalance thousands of regions in one go; needs an upper bound added.
> ------------------------------------------------------------------------------------------
>
>                 Key: HBASE-3422
>                 URL: https://issues.apache.org/jira/browse/HBASE-3422
>             Project: HBase
>          Issue Type: Improvement
>          Components: master
>    Affects Versions: 0.90.0
>            Reporter: stack
>            Assignee: Ted Yu
>             Fix For: 0.92.0
>
>         Attachments: hbase-3422.txt
>
>
> See HBASE-3420.  Therein, a wonky cluster had 5k regions on one server and < 1k on others.  Balancer ran and wanted to redistribute 3k+ all in one go.  Madness.
> If a load of rebalancing to be done, should be done somewhat piecemeal.  We need maximum regions to rebalance at a time upper bound at a minimum.

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