Uploaded image for project: 'Hadoop HDFS'
  1. Hadoop HDFS
  2. HDFS-11419 BlockPlacementPolicyDefault is choosing datanode in an inefficient way
  3. HDFS-11577

Combine the old and the new chooseRandom for better performance

    XMLWordPrintableJSON

    Details

    • Type: Sub-task
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.9.0, 3.0.0-alpha4
    • Component/s: namenode
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      As discussed in HDFS-11535, this JIRA adds a new function combining both the new and the old chooseRandom methods for better performance.

      More specifically, when choosing a random node with storage type requirement, the combined method first tries the old method of blindly picking a random node. If this node satisfies, it is returned. Otherwise, the new chooseRandom is called, which guarantees to find a eligible node in one call (if there is one at all).

        Attachments

        1. HDFS-11577.001.patch
          8 kB
          Chen Liang
        2. HDFS-11577.002.patch
          8 kB
          Chen Liang
        3. HDFS-11577.003.patch
          8 kB
          Yiqun Lin

          Activity

            People

            • Assignee:
              vagarychen Chen Liang
              Reporter:
              vagarychen Chen Liang
            • Votes:
              0 Vote for this issue
              Watchers:
              4 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved: