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  1. Hadoop HDFS
  2. HDFS-8825 Enhancements to Balancer
  3. HDFS-8826

Balancer may not move blocks efficiently in some cases

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    Details

    • Type: Sub-task
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.8.0, 3.0.0-alpha1
    • Component/s: balancer & mover
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      Balancer is inefficient in the following case:

      Datanode Utilization Rack
      D1 95% A
      D2 30% B
      D3, D4, D5 0% B

      The average utilization is 25% so that D2 is within 10% threshold. However, Balancer currently will first move blocks from D2 to D3, D4 and D5 since they are under the same rack. Then, it will move blocks from D1.

        Attachments

        1. h8826_20150818.patch
          29 kB
          Tsz-wo Sze
        2. h8826_20150816.patch
          29 kB
          Tsz-wo Sze
        3. h8826_20150811.patch
          27 kB
          Tsz-wo Sze

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            • Assignee:
              szetszwo Tsz-wo Sze
              Reporter:
              szetszwo Tsz-wo Sze

              Dates

              • Created:
                Updated:
                Resolved:

                Issue deployment