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  1. HBase
  2. HBASE-6228

Fixup daughters twice cause daughter region assigned twice

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Implemented
    • Affects Version/s: None
    • Fix Version/s: 0.95.0
    • Component/s: master
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      First, how fixup daughters twice happen?
      1.we will fixupDaughters at the last of HMaster#finishInitialization
      2.ServerShutdownHandler will fixupDaughters when reassigning region through ServerShutdownHandler#processDeadRegion

      When fixupDaughters, we will added daughters to .META., but it coudn't prevent the above case, because FindDaughterVisitor.

      The detail is as the following:
      Suppose region A is a splitted parent region, and its daughter region B is missing

      1.First, ServerShutdownHander thread fixup daughter, so add daughter region B to .META. with serverName=null, and assign the daughter.

      2.Then, Master's initialization thread will also find the daughter region B is missing and assign it. It is because FindDaughterVisitor consider daughter is missing if its serverName=null

        Attachments

        1. HBASE-6228v4.patch
          9 kB
          ramkrishna.s.vasudevan
        2. HBASE-6228v3.patch
          7 kB
          chunhui shen
        3. HBASE-6228v2.patch
          0.9 kB
          chunhui shen
        4. HBASE-6228v2.patch
          1.0 kB
          chunhui shen
        5. HBASE-6228.patch
          0.8 kB
          chunhui shen

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              • Assignee:
                zjushch chunhui shen
                Reporter:
                zjushch chunhui shen
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                Dates

                • Created:
                  Updated:
                  Resolved: