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  1. Hadoop Common
  2. HADOOP-96

name server should log decisions that affect data: block creation, removal, replication

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Critical
    • Resolution: Fixed
    • Affects Version/s: 0.1.0
    • Fix Version/s: 0.2.0
    • Component/s: None
    • Labels:
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      Description

      currently, there's no way to analyze and debug DFS errors where blocks disapear.
      name server should log its decisions that affect data, including block creation, removal, replication:

      • block <b> created, assigned to datanodes A, B, ...
      • datanode A dead, block <b> underreplicated(1), replicating to datanode C
      • datanode B dead, block <b> underreplicated(2), replicating to datanode D
      • datanode A alive, block <b> overreplicated, removing from datanode D
      • block <removed> from datanodes C, D, ...

      that will enable me to track down, two weeks later, a block that's missing from a file, and to debug the name server.

      extra credit:

      • rotate log file, as it might grow large
      • make this behaviour optional/configurable

        Attachments

        1. namenodeLogging.patch
          56 kB
          Hairong Kuang
        2. namenodeLogging.patch
          55 kB
          Hairong Kuang
        3. namenodeLogging.patch
          55 kB
          Hairong Kuang

          Activity

            People

            • Assignee:
              hairong Hairong Kuang
              Reporter:
              yarnon Yoram Arnon
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              Dates

              • Created:
                Updated:
                Resolved: