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Date: Sun, 21 Dec 2008 08:36:44 -0800 (PST)
From: "Andrew Purtell (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Commented: (HBASE-1066) Master should support
 close/open/reassignment/enable/disable operations on individual regions
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    [ https://issues.apache.org/jira/browse/HBASE-1066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12658396#action_12658396 ] 

Andrew Purtell commented on HBASE-1066:
---------------------------------------

The HBaseAdmin.modifyTable API is perfect for that. Just add op constants and backing implementation in HMaster for MODIFY_TABLE_CLOSE, MODIFY_TABLE_OPEN, etc. 

> Master should support close/open/reassignment/enable/disable operations on individual regions
> ---------------------------------------------------------------------------------------------
>
>                 Key: HBASE-1066
>                 URL: https://issues.apache.org/jira/browse/HBASE-1066
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: Andrew Purtell
>             Fix For: 0.19.0
>
>
> The master should support close/open/reassignment/enable/disable operations on individual regions by way of a client API and corresponding shell command(s), and maybe also controls on the master UI.
>  
> If one region out of 1000s is closed or offline, for example due to transient DFS problems, currently the whole table must be disabled, then reenabled to trigger reassignment and, hopefully, successful (re)open of the offline regions. The flurry of compactions this causes can exacerbate the underlying problem and actually make cluster state worse, as more DFS errors accumulate. 

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