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Date: Tue, 24 May 2011 03:05:50 +0000 (UTC)
From: "Vishal Kathuria (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-3833) ability to support
 includes/excludes list in Hbase
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    [ https://issues.apache.org/jira/browse/HBASE-3833?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13038364#comment-13038364 ] 

Vishal Kathuria commented on HBASE-3833:
----------------------------------------

Stack:
My intention was build a graceful shutdown (that is the reason I assign the regions first and then expire the server). I assumed that assign* API unloads them off the source region server when assigning them to the new region server, but I guess I was wrong in that assumption. Let me take a look at the code again to see how I can change it to make the shutdown graceful and not have the situation you mentioned of two servers owning the region - that is clearly not desirable.

Yuzhi:
In case any of the meta regions are involved, then the MetaServerShutdownHandler is dispatched. That class has both  isCarryingRoot() and isCarryingMeta() defined.

I will publish another patch in a couple of days. Stack, please hold on to hacking this in. 

Thanks!
Vishal

> ability to support includes/excludes list in Hbase
> --------------------------------------------------
>
>                 Key: HBASE-3833
>                 URL: https://issues.apache.org/jira/browse/HBASE-3833
>             Project: HBase
>          Issue Type: Improvement
>          Components: client, regionserver
>    Affects Versions: 0.90.2
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: excl-patch.txt, excl-patch.txt
>
>
> An HBase cluster currently does not have the ability to specify that the master should accept regionservers only from a specified list. This helps preventing administrative errors where the same machine could be included in two clusters. It also allows the administrator to easily remove un-ssh-able machines from the cluster.

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