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Date: Fri, 16 May 2014 21:11:55 +0000 (UTC)
From: "Mikhail Antonov (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12710152.1398287682303.371592.1400274715384@arcas>
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Subject: [jira] [Commented] (HBASE-11059) ZK-less region assignment
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    [ https://issues.apache.org/jira/browse/HBASE-11059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14000308#comment-14000308 ] 

Mikhail Antonov commented on HBASE-11059:
-----------------------------------------

To recap some of the notes from the doc, to discuss further..

 - the "atomic" short-circuit updates of META are only possible if META is guaranteed to be hosted on active master, which is not the case if HBASE-10569 topology is turned off, unless I'm missing something?
 - if we had system table with statistics (like region size, number of rows in each one etc) we could do master-initiated splits and merges - do you think it would be beneficial in terms of more even load on Master [~jxiang]?

> ZK-less region assignment
> -------------------------
>
>                 Key: HBASE-11059
>                 URL: https://issues.apache.org/jira/browse/HBASE-11059
>             Project: HBase
>          Issue Type: Improvement
>          Components: master, Region Assignment
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>         Attachments: zk-less_am.pdf
>
>
> It seems that most people don't like region assignment with ZK (HBASE-5487), which causes many uncertainties. This jira is to support ZK-less region assignment. We need to make sure this patch doesn't break backward compatibility/rolling upgrade.


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