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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7721) Local Transactions in META
Date Mon, 25 Feb 2013 21:00:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13586275#comment-13586275
] 

stack commented on HBASE-7721:
------------------------------

[~enis] You going to commit this one or you think there is stuff to do still?  Good on you.
                
> Local Transactions in META
> --------------------------
>
>                 Key: HBASE-7721
>                 URL: https://issues.apache.org/jira/browse/HBASE-7721
>             Project: HBase
>          Issue Type: Improvement
>          Components: Coprocessors, regionserver
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>             Fix For: 0.96.0
>
>
> Thanks to Lars' local transactions patch (HBASE-5229), we can entertain the possibility
of doing local transactions within META regions.
> We need this mainly for region splits and merges. Clients scan the META concurrent to
the split/merge operations, and to prevent the clients from seeing overlapping region boundaries
or holes in META, we just through hoops. For more backgroun, see BlockingMetaScannerVisitor,
HBASE-5986, and my comments at https://reviews.apache.org/r/8716/. 
> Now, for the actual implementation options: 
>  1. As outlined in http://hadoop-hbase.blogspot.com/2012_02_01_archive.html, 
>    - We have to implement a Custom RegionSplitPolicy for the META regions to ensure that
a table's regions are always co-located in the same META region. Then we can add MultiRowMutationEndpoint
as a system level coprocessor, and use it for META operations. 
>  2. Do smt like HBASE-7716, and expose local atomic multi-row operations as a native
API.
>  3. Move META to zookeeper. Use zookeeper.multi.  
> Then we can change region split / merge logic to make use of atomic META operations.

> Thoughts, suggestions? 

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