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  1. Hadoop HDFS
  2. HDFS-854

Datanode should scan devices in parallel to generate block report

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: 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.

        Attachments

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

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              • Assignee:
                dms Dmytro Molkov
                Reporter:
                dhruba dhruba borthakur
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                Dates

                • Created:
                  Updated:
                  Resolved: