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  1. HBase
  2. HBASE-7721

Atomic multi-row mutations in META

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    • Hadoop Flags:
      Reviewed
    • Tags:
      0.96notable

      Description

      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?

        Attachments

        1. hbase-7721_v1.patch
          84 kB
          Enis Soztutar
        2. hbase-7721_v2.patch
          82 kB
          Enis Soztutar
        3. hbase-7721_v3.patch
          82 kB
          Enis Soztutar
        4. hbase-7721_v4.patch
          82 kB
          Enis Soztutar
        5. hbase-7721_v4-0.95.patch
          74 kB
          Enis Soztutar

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              • Assignee:
                enis Enis Soztutar
                Reporter:
                enis Enis Soztutar
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