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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2802) Stop daughter regions both being assigned same server
Date Fri, 02 Jul 2010 22:59:49 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12884846#action_12884846
] 

Jean-Daniel Cryans commented on HBASE-2802:
-------------------------------------------

IMO this issue is a workaround for the master's inability to balance on requests load (instead
of regions). With better load balancing, we should do a better job at redistributing regions
on the cluster so this patch won't be needed.

> Stop daughter regions both being assigned same server
> -----------------------------------------------------
>
>                 Key: HBASE-2802
>                 URL: https://issues.apache.org/jira/browse/HBASE-2802
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: stack
>             Fix For: 0.20.6, 0.21.0
>
>         Attachments: moz.txt
>
>
> On split, usually the two daughter regions end up on assignment list at same time.  Dependent
on cluster state and what balancer says, when a server checks in, we'll assign at least two
regions in the one go so daughters then end up on same server.  This patch makes it so we
don't assign contiguous regions in the one assignment.

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