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  1. Hadoop HDFS
  2. HDFS-5891

webhdfs should not try connecting the DN during redirection

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.4.0
    • Component/s: namenode, webhdfs
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      When the webhdfs server in NN serves an OPEN request, the NN will eventually redirect the request to a DN. The current implementation intends to choose the active DNs. The code always connects to the DN in a deterministic order to see whether it is active during redirection.

      Although it reduces the chance of the client from connecting to a failed DN, this is problematic because:

      1. It has no guarantees that the client can connect to that DN even if the NN can connect to it.
      2. It requires an additional network round-trip for every OPEN / CREATE request.

      This jira proposes that the NN should choose the DN based on the information of the data node manager.

        Attachments

        1. HDFS-5891.001.patch
          12 kB
          Haohui Mai
        2. HDFS-5891.000.patch
          12 kB
          Haohui Mai

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              • Assignee:
                wheat9 Haohui Mai
                Reporter:
                wheat9 Haohui Mai
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                Dates

                • Created:
                  Updated:
                  Resolved: