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  1. ZooKeeper
  2. ZOOKEEPER-1483

Fix leader election recipe documentation

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Details

    • Bug
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • 3.4.3
    • 3.4.4, 3.5.0
    • documentation
    • 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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              michim Michi Mutsuzaki
              ankur Ankur Bansal
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              Dates

                Created:
                Updated:
                Resolved: