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Date: Wed, 18 May 2011 23:46:48 +0000 (UTC)
From: "stack (JIRA)" <jira@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=13035859#comment-13035859 ] 

stack commented on HBASE-3833:
------------------------------

bq. 2. enqueues a shutdownhandler to move all the regions off this node

ServerShutdownHandler splits logs and reassigns regions that were (or *are* in the decommissioning case) up on the shutdown server.  It does not unload them off the hosting regionserver.  So, it looks to me as though regions can be in two places at once... still on the server that has been marked decommissioned and up in the new locations that ServerShutdownHandler has assigned them too.  This looks a little dangerous (if I am reading this right).

If decommissioning, it looks like you expire the server only at the end of the server shutdown processing (your call to markServerExpiry will be noticed by the hosting regionserver and it'll shut itself down closing out the regions it was hosting).

New JIRA for Karthiks suggestion sounds good.

> 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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