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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-1066) Master should support close/open/reassignment/enable/disable operations on individual regions
Date Tue, 23 Dec 2008 06:51:44 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1066?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-1066:
-------------------------

    Attachment: 1066.patch

Not fully tested.  Adds enable/disable to the shell.  Adds close of a region.  Others, open
and reassign are tricky.  How do I say open a region?  The scanners are supposed to be looking
at the .META. and opening unopened tables.  Same for reassign.  Just close it and then when
scanner runs, it'll be assigned elsewhere.

> 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
>
>         Attachments: 1066.patch
>
>
> 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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