Return-Path: 
 <issues-return-16764-apmail-hbase-issues-archive=hbase.apache.org@hbase.apache.org>
X-Original-To: apmail-hbase-issues-archive@www.apache.org
Delivered-To: apmail-hbase-issues-archive@www.apache.org
Received: from mail.apache.org (hermes.apache.org [140.211.11.3])
	by minotaur.apache.org (Postfix) with SMTP id 8DC9F755C
	for <apmail-hbase-issues-archive@www.apache.org>;
 Wed, 17 Aug 2011 14:48:54 +0000 (UTC)
Received: (qmail 49775 invoked by uid 500); 17 Aug 2011 14:48:54 -0000
Delivered-To: apmail-hbase-issues-archive@hbase.apache.org
Received: (qmail 49511 invoked by uid 500); 17 Aug 2011 14:48:53 -0000
Mailing-List: contact issues-help@hbase.apache.org; run by ezmlm
Precedence: bulk
List-Help: <mailto:issues-help@hbase.apache.org>
List-Unsubscribe: <mailto:issues-unsubscribe@hbase.apache.org>
List-Post: <mailto:issues@hbase.apache.org>
List-Id: <issues.hbase.apache.org>
Delivered-To: mailing list issues@hbase.apache.org
Received: (qmail 49398 invoked by uid 99); 17 Aug 2011 14:48:53 -0000
Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230)
    by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 17 Aug 2011 14:48:53 +0000
X-ASF-Spam-Status: No, hits=-2001.1 required=5.0
	tests=ALL_TRUSTED,RP_MATCHES_RCVD
X-Spam-Check-By: apache.org
Received: from [140.211.11.116] (HELO hel.zones.apache.org) (140.211.11.116)
    by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 17 Aug 2011 14:48:51 +0000
Received: from hel.zones.apache.org (hel.zones.apache.org [140.211.11.116])
	by hel.zones.apache.org (Postfix) with ESMTP id DFBA3C0ABD
	for <issues@hbase.apache.org>; Wed, 17 Aug 2011 14:48:29 +0000 (UTC)
Date: Wed, 17 Aug 2011 14:48:29 +0000 (UTC)
From: "Ted Yu (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: 
 <1341077325.45361.1313592509913.JavaMail.tomcat@hel.zones.apache.org>
In-Reply-To: 
 <1069350939.45141.1313590047417.JavaMail.tomcat@hel.zones.apache.org>
Subject: [jira] [Issue Comment Edited] (HBASE-4213) Support instant schema
 updates with out master's intervention (i.e with out enable/disable and
 bulk assign/unassign)
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394
X-Virus-Checked: Checked by ClamAV on apache.org


    [ https://issues.apache.org/jira/browse/HBASE-4213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13086356#comment-13086356 ] 

Ted Yu edited comment on HBASE-4213 at 8/17/11 2:47 PM:
--------------------------------------------------------

I haven't gone through the patch yet.
bq. 5. Master will recursively delete the node /hbase/schema/<table name>, if the number of childrens of /hbase/schema/<table name> is greater than or equal to current number of active region servers.
You meant recursively deleting the children of node /hbase/schema/<table name>, right ?

For region server which joins the cluster after the creation of /hbase/schema/<table name>, it should be able to find out that it already reads the most recent HTD. Does it create a child node under /hbase/schema/<table name> ?

      was (Author: yuzhihong@gmail.com):
    I haven't gone through the patch yet.
bq. 5. Master will recursively delete the node /hbase/schema/<table name>, if the number of childrens
  of /hbase/schema/<table name> is greater than or equal to current number of active region servers.
You meant recursively deleting the children of node /hbase/schema/<table name>, right ?

For region server which joins the cluster after the creation of /hbase/schema/<table name>, it should be able to find out that it already reads the most recent HTD. Does it create a child node under /hbase/schema/<table name> ?
  
> Support instant schema updates with out master's intervention (i.e with out enable/disable and bulk assign/unassign)
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-4213
>                 URL: https://issues.apache.org/jira/browse/HBASE-4213
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Subbu M Iyer
>            Assignee: Subbu M Iyer
>         Attachments: HBASE-4213-Instant_schema_change.patch
>
>
> This Jira is a slight variation in approach to what is being done as part of 
> https://issues.apache.org/jira/browse/HBASE-1730
> Support instant schema updates such as Modify Table, Add Column, Modify Column operations:
> 1. With out enable/disabling the table.
> 2. With out bulk unassign/assign of regions.

--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira