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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1419) Assignment and balance need to coordinate; assigner gives out up to 10 regions at a time unbalancing a balanced cluster making for churn, etc.
Date Wed, 01 Sep 2010 05:49:54 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12904933#action_12904933
] 

Jonathan Gray commented on HBASE-1419:
--------------------------------------

Should be all better now.

> Assignment and balance need to coordinate; assigner gives out up to 10 regions at a time
unbalancing a balanced cluster making for churn, etc.
> ----------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-1419
>                 URL: https://issues.apache.org/jira/browse/HBASE-1419
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>
> Assigner needs to take into account current region balance.  I'm seeing on recovery from
a crash on a big cluster that we'll give near ten regions to first regionserver that reports
in.  If that regionserver successfully opens the assigned ten, then that'll put it over the
balancer slop differential and it'll then be asked to close its regions by the balancer. 
This adds to the regionserver crash churn.  Dumb.

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