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

        Issue Links

          Activity

          dhruba borthakur created issue -
          dhruba borthakur made changes -
          Field Original Value New Value
          Assignee Dmytro Molkov [ dms ]
          Dmytro Molkov made changes -
          Attachment HDFS-854.patch [ 12438481 ]
          Dmytro Molkov made changes -
          Status Open [ 1 ] Patch Available [ 10002 ]
          Affects Version/s 0.22.0 [ 12314241 ]
          Fix Version/s 0.22.0 [ 12314241 ]
          Dmytro Molkov made changes -
          Status Patch Available [ 10002 ] Open [ 1 ]
          Dmytro Molkov made changes -
          Status Open [ 1 ] Patch Available [ 10002 ]
          Dmytro Molkov made changes -
          Status Patch Available [ 10002 ] Open [ 1 ]
          Dmytro Molkov made changes -
          Attachment HDFS-854.patch.1 [ 12438985 ]
          Dmytro Molkov made changes -
          Status Open [ 1 ] Patch Available [ 10002 ]
          Dmytro Molkov made changes -
          Status Patch Available [ 10002 ] Open [ 1 ]
          Dmytro Molkov made changes -
          Status Open [ 1 ] Patch Available [ 10002 ]
          Dmytro Molkov made changes -
          Attachment HDFS-854-2.patch [ 12439737 ]
          Dmytro Molkov made changes -
          Status Patch Available [ 10002 ] Open [ 1 ]
          Dmytro Molkov made changes -
          Status Open [ 1 ] Patch Available [ 10002 ]
          Jakob Homan made changes -
          Hadoop Flags [Reviewed]
          Jakob Homan made changes -
          Status Patch Available [ 10002 ] Resolved [ 5 ]
          Resolution Fixed [ 1 ]
          Tom White made changes -
          Fix Version/s 0.21.0 [ 12314046 ]
          Fix Version/s 0.22.0 [ 12314241 ]
          Tom White made changes -
          Status Resolved [ 5 ] Closed [ 6 ]
          Matt Foley made changes -
          Link This issue is related to HDFS-270 [ HDFS-270 ]

            People

            • Assignee:
              Dmytro Molkov
              Reporter:
              dhruba borthakur
            • Votes:
              0 Vote for this issue
              Watchers:
              11 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved:

                Development