[jira] Commented: (HBASE-862) region balancing is clumsy

["Jean-Daniel Cryans (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12627812#action_12627812 ] 

Jean-Daniel Cryans commented on HBASE-862:
------------------------------------------

+1, I see it too.

> region balancing is clumsy
> --------------------------
>
>                 Key: HBASE-862
>                 URL: https://issues.apache.org/jira/browse/HBASE-862
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: stack
>
> Daniel Leffel has an install of 500 regions on 4 nodes.  He's running 0.2.0.
> On restart, load balancing is running while the 600 regions are being initially opened.  Makes for churn.  Load balancing should wait before it cuts in.
> Have also seen on occasion that it will not find equilibrium after a restart.
> Adding a node is catastrophic.  >20% of the regions were closed and were taking the longest time to show up on the new server.  I would think that the region balancing would work in more sophisticated and gradual manner.

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