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  1. Hadoop Common
  2. HADOOP-7454 Common side of High Availability Framework (HDFS-1623)
  3. HADOOP-7961

HA: fencing mechanism

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Details

    • Sub-task
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • None
    • HA Branch (HDFS-1623)
    • ha
    • None
    • Reviewed

    Description

      In an HA cluster, when there are two NNs, the invariant that only one NN is active at a time has to be preserved in order to prevent "split brain syndrome." Thus, when a standby NN is transition to "active" state during a failover, it needs to somehow fence the formerly active NN to ensure that it can no longer perform edits. This JIRA is to discuss and implement NN fencing.

      Attachments

        1. hdfs-2179.txt
          41 kB
          Todd Lipcon
        2. hdfs-2179.txt
          46 kB
          Todd Lipcon
        3. hdfs-2179.txt
          46 kB
          Todd Lipcon
        4. hadoop-7961-delta.txt
          10 kB
          Eli Collins

        Issue Links

          relates to

          Improvement - An improvement or enhancement to an existing feature or task. HADOOP-14309 Add PowerShell NodeFencer

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Activity

            People

              tlipcon Todd Lipcon
              tlipcon Todd Lipcon
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              Dates

                Created:
                Updated:
                Resolved: