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  1. ZooKeeper
  2. ZOOKEEPER-1483

Fix leader election recipe documentation

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 3.4.3
    • Fix Version/s: 3.4.4, 3.5.0
    • Component/s: documentation
    • Labels:
      None

      Description

      The leader election recipe documentation suggest that to avoid the herd effect a client process volunteering for leadership via child znode [i] under the leader election path [/leader] must only watch the the SMALLEST znode [j] from a different client process such that [j < i].

      This will NOT avoid the herd effect as many clients will end up watching the same znode[j] where j is the next-in-sequence number greater than the number of the current leader.

      Specifically in Step 3 of the Election procedure here http://zookeeper.apache.org/doc/trunk/recipes.html#sc_leaderElection

      This "where j is the SMALLEST sequence number" should be changed to this
      "where j is the LARGEST sequence number"

        Attachments

        1. ZOOKEEPER-1483-3.4.patch
          1 kB
          Michi Mutsuzaki
        2. ZOOKEEPER-1483-trunk.patch
          1 kB
          Michi Mutsuzaki

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              • Assignee:
                michim Michi Mutsuzaki
                Reporter:
                ankur Ankur
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                • Created:
                  Updated:
                  Resolved: