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  1. HBase
  2. HBASE-543

A region's state is kept in several places in the master opening the possibility for race conditions

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 0.1.0, 0.1.1, 0.2.0
    • 0.19.0
    • master
    • None

    Description

      A region's state exists in multiple maps in the RegionManager: unassignedRegions, pendingRegions, regionsToClose, closingRegions, regionsToDelete, etc.

      One of these race conditions was found in HBASE-534.

      For HBase-0.1.x, we should just patch the holes we find.

      The ultimate solution (which requires a lot of changes in HMaster) should be applied to HBase trunk.

      Proposed solution:

      Create a class that encapsulates a region's state and provide synchronized access to the class that validates state changes.
      There should be a single structure that holds regions in these transitional states and it should be a synchronized collection of some kind.

      Attachments

        1. 543.patch
          49 kB
          Jim Kellerman
        2. 543.patch
          48 kB
          Jim Kellerman
        3. 543.patch
          36 kB
          Michael Stack
        4. 543.patch-4
          50 kB
          Jim Kellerman
        5. 543.patch-5
          67 kB
          Jim Kellerman
        6. 543.patch-6
          70 kB
          Jim Kellerman
        7. recent-changes.patch
          38 kB
          Michael Stack
        8. regionstate.txt
          4 kB
          Jim Kellerman

        Issue Links

          blocks

          Improvement - An improvement or enhancement to an existing feature or task. HBASE-546 Use Zookeeper in HBase

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. HBASE-504 Allow HMsg's carry a payload: e.g. exception that happened over on the remote side.

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed
          is related to

          Bug - A problem which impairs or prevents the functions of the product. HBASE-549 Don't CLOSE region if message is not from server that opened it or is opening it

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. HBASE-1077 Master does not reassign regions closed while opening

          • Major - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. HBASE-599 CME iterating return from ServerManager.getMarkedToClose

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
          There are no Sub-Tasks for this issue.

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              jimk Jim Kellerman
              jimk Jim Kellerman
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              Dates

                Created:
                Updated:
                Resolved: