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https://issues.apache.org/jira/browse/HBASE-7721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13570471#comment-13570471
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stack commented on HBASE-7721:
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[~mbertozzi] You would have .META. rows just be table names? And then the
region name would be column qualifiers? We'd have two columns per region --
one to hold regioninfo and another to hold the servername -- or we'd just have
the one cell that had both regioninfo and servername in it (probably the
former...) [~jesse_yates] suggested something along this direction in
hbase-2600 but not as radical (or 'clean') as your idea. I like your
suggestion. Stick it over on hbase-2600?
> 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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