Uploaded image for project: 'ZooKeeper'
  1. ZooKeeper
  2. ZOOKEEPER-790

Last processed zxid set prematurely while establishing leadership

    XMLWordPrintableJSON

Details

    • Bug
    • Status: Closed
    • Blocker
    • Resolution: Fixed
    • 3.3.1
    • 3.3.2, 3.4.0
    • quorum
    • None
    • Reviewed

    Description

      The leader code is setting the last processed zxid to the first of the new epoch even before connecting to a quorum of followers. Because the leader code sets this value before connecting to a quorum of followers (Leader.java:281) and the follower code throws an IOException (Follower.java:73) if the leader epoch is smaller, we have that when the false leader drops leadership and becomes a follower, it finds a smaller epoch and kills itself.

      Attachments

        1. ZOOKEEPER-790.patch
          1 kB
          Flavio Paiva Junqueira
        2. ZOOKEEPER-790.travis.log.bz2
          44 kB
          Travis Crawford
        3. ZOOKEEPER-790.patch
          3 kB
          Flavio Paiva Junqueira
        4. ZOOKEEPER-790.patch
          13 kB
          Flavio Paiva Junqueira
        5. ZOOKEEPER-790-3.3.patch
          12 kB
          Flavio Paiva Junqueira
        6. ZOOKEEPER-790.patch
          13 kB
          Flavio Paiva Junqueira
        7. ZOOKEEPER-790-3.3.patch
          13 kB
          Flavio Paiva Junqueira
        8. ZOOKEEPER-790.patch
          13 kB
          Flavio Paiva Junqueira
        9. ZOOKEEPER-790-follower-request-NPE.log
          16 kB
          Sergey Doroshenko
        10. ZOOKEEPER-790.v2.patch
          4 kB
          Flavio Paiva Junqueira
        11. ZOOKEEPER-790-test.patch
          10 kB
          Sergey Doroshenko
        12. ZOOKEEPER-790.v2.patch
          17 kB
          Flavio Paiva Junqueira
        13. ZOOKEEPER-790-3.3.v2.patch
          17 kB
          Flavio Paiva Junqueira
        14. ZOOKEEPER-790.v2.patch
          17 kB
          Flavio Paiva Junqueira

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. ZOOKEEPER-335 zookeeper servers should commit the new leader txn to their logs.

          • Blocker - Blocks development and/or testing work, production could not run
          • Closed

          Activity

            People

              fpj Flavio Paiva Junqueira
              fpj Flavio Paiva Junqueira
              Votes:
              0 Vote for this issue
              Watchers:
              2 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved: