ZooKeeper
  1. ZooKeeper
  2. ZOOKEEPER-822

Leader election taking a long time to complete

    Details

    • Type: Bug Bug
    • Status: Closed
    • Priority: Blocker Blocker
    • Resolution: Fixed
    • Affects Version/s: 3.3.0
    • Fix Version/s: 3.3.2, 3.4.0
    • Component/s: quorum
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      Created a 3 node cluster.

      1 Fail the ZK leader
      2. Let leader election finish. Restart the leader and let it join the
      3. Repeat

      After a few rounds leader election takes anywhere 25- 60 seconds to finish. Note- we didn't have any ZK clients and no new znodes were created.

      zoo.cfg is shown below:

      #Mon Jul 19 12:15:10 UTC 2010
      server.1=192.168.4.12\:2888\:3888
      server.0=192.168.4.11\:2888\:3888
      clientPort=2181
      dataDir=/var/zookeeper
      syncLimit=2
      server.2=192.168.4.13\:2888\:3888
      initLimit=5
      tickTime=2000

      I have attached logs from two nodes that took a long time to form the cluster after failing the leader. The leader was down anyways so logs from that node shouldn't matter.
      Look for "START HERE". Logs after that point should be of our interest.

      1. ZOOKEEPER-822-3.3.2.patch
        7 kB
        Flavio Junqueira
      2. ZOOKEEPER-822-3.3.2.patch
        7 kB
        Flavio Junqueira
      3. ZOOKEEPER-822-3.3.2.patch
        8 kB
        Flavio Junqueira
      4. ZOOKEEPER-822-3.3.2.patch
        9 kB
        Flavio Junqueira
      5. ZOOKEEPER-822.patch_v1
        6 kB
        Vishal Kher
      6. ZOOKEEPER-822.patch
        5 kB
        Flavio Junqueira
      7. ZOOKEEPER-822.patch
        7 kB
        Flavio Junqueira
      8. ZOOKEEPER-822.patch
        7 kB
        Flavio Junqueira
      9. ZOOKEEPER-822.patch
        7 kB
        Flavio Junqueira
      10. ZOOKEEPER-822.patch
        8 kB
        Flavio Junqueira
      11. ZOOKEEPER-822.patch
        9 kB
        Flavio Junqueira
      12. zookeeper-3.4.0.tar.gz
        33 kB
        Vishal Kher
      13. zk_leader_election.tar.gz
        53 kB
        Vishal Kher
      14. test_zookeeper_2.log
        215 kB
        Vishal Kher
      15. test_zookeeper_1.log
        212 kB
        Vishal Kher
      16. rhel.tar.gz
        91 kB
        Vishal Kher
      17. 822.tar.gz
        47 kB
        Vishal Kher

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          People

          • Assignee:
            Vishal Kher
            Reporter:
            Vishal Kher
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            Dates

            • Created:
              Updated:
              Resolved:

              Development