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Date: Fri, 20 May 2011 05:31:48 +0000 (UTC)
From: "stack (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (HBASE-3866) Script to add regions gradually to a
 new regionserver.
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     [ https://issues.apache.org/jira/browse/HBASE-3866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HBASE-3866:
-------------------------

    Hadoop Flags: [Reviewed]
          Status: Patch Available  (was: Open)

Marking patch available.  I'm not committing just yet.  The original script is a hackup that might be useful to others.  The patch Ted adds should be factored into any balancer improvements.

> Script to add regions gradually to a new regionserver.
> ------------------------------------------------------
>
>                 Key: HBASE-3866
>                 URL: https://issues.apache.org/jira/browse/HBASE-3866
>             Project: HBase
>          Issue Type: Improvement
>          Components: scripts
>    Affects Versions: 0.90.2
>            Reporter: Aravind Gottipati
>            Priority: Minor
>         Attachments: 3866-max-regions-per-iteration.patch, slow_balancer.rb, slow_balancer.rb
>
>
> When a new region server is brought online, the current balancer kicks off a whole bunch of region moves and causes a lot of regions to be un-available right away.  A slower balancer that gradually balances the cluster is probably a good script to have.  I have an initial version that mooches off the region_mover script to do this.

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