Enis Soztutar created HBASE-7721:
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Summary: 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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