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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3422) Balancer will willing try to rebalance thousands of regions in one go; needs an upper bound added.
Date Fri, 18 Mar 2011 14:24:29 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008447#comment-13008447
] 

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

Currently it is possible for one HMaster.balance() call to last longer than hbase.balancer.period

We should limit the execution time of HMaster.balance() by hbase.balancer.period
Is this equivalent to introducing hbase.balancer.maxregions.perround ?

> Balancer will willing 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
>    Affects Versions: 0.90.0
>            Reporter: stack
>            Assignee: Ted Yu
>
> 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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