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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3422) Balancer will try to rebalance thousands of regions in one go; needs an upper bound added.
Date Fri, 18 Mar 2011 23:19:29 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008673#comment-13008673
] 

Ted Yu commented on HBASE-3422:
-------------------------------

Summary of chat with Stack on IRC (see http://pastebin.com/4uK9M1Z7):
Since it is difficult to estimate the appropriate number of regions to balance in one invocation
of balance(), I resort to respecting the hbase.balancer.period
Another option would be to limit execution time of balance() to certain percentage of hbase.balancer.period
But that would introduce another parameter which complicates our scenario.


> 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
>         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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