Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.23.0
    • Fix Version/s: 0.23.0
    • Component/s: contrib/raid
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      Raid introduce the new dependency between blocks within a file.
      The blocks help decode each other. Therefore we should avoid put them on the same machine.

      The proposed BlockPlacementPolicy does the following
      1. When writing parity blocks, it avoid the parity blocks and source blocks sit together.
      2. When reducing replication number, it deletes the blocks that sits with other dependent blocks.
      3. It does not change the way we write normal files. It only has different behavior when processing raid files.

        Attachments

        1. test.result
          52 kB
          Scott Chen
        2. MAPREDUCE-1831-v2.txt
          45 kB
          Scott Chen
        3. MAPREDUCE-1831.20100610.txt
          10 kB
          Scott Chen
        4. MAPREDUCE-1831.v1.1.txt
          8 kB
          Scott Chen
        5. MAPREDUCE-1831.txt
          7 kB
          Scott Chen

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              • Assignee:
                schen Scott Chen
                Reporter:
                schen Scott Chen
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                • Created:
                  Updated:
                  Resolved: