Hadoop HDFS
  1. Hadoop HDFS
  2. HDFS-854

Datanode should scan devices in parallel to generate block report

    Details

    • Type: Improvement Improvement
    • Status: Closed
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: 0.22.0
    • Fix Version/s: 0.21.0
    • Component/s: datanode
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      A Datanode should scan its disk devices in parallel so that the time to generate a block report is reduced. This will reduce the startup time of a cluster.
      A datanode has 12 disk (each of 1 TB) to store HDFS blocks. There is a total of 150K blocks on these 12 disks. It takes the datanode upto 20 minutes to scan these devices to generate the first block report.

      1. HDFS-854.patch
        8 kB
        Dmytro Molkov
      2. HDFS-854.patch.1
        9 kB
        Dmytro Molkov
      3. HDFS-854-2.patch
        10 kB
        Dmytro Molkov

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            People

            • Assignee:
              Dmytro Molkov
              Reporter:
              dhruba borthakur
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              Dates

              • Created:
                Updated:
                Resolved:

                Development