ZooKeeper
  1. ZooKeeper
  2. ZOOKEEPER-1264 FollowerResyncConcurrencyTest failing intermittently
  3. ZOOKEEPER-1291

AcceptedEpoch not updated at leader before it proposes the epoch to followers

        Details

        • Type: Sub-task Sub-task
        • Status: Closed
        • Priority: Major Major
        • Resolution: Fixed
        • Affects Version/s: 3.4.0
        • Fix Version/s: 3.4.0, 3.5.0
        • Component/s: server
        • Labels:
          None
        • Release Note:
          Revision 1198053

          Description

          It is possible that a leader proposes an epoch e and a follower adopts it by setting acceptedEpoch to e but the leader itself hasn't yet done so.

          While I'm not sure this contradicts Zab (there is no description of where the leader actually sets its acceptedEpoch), it is very counter intuitive.

          The fix is to set acceptedEpoch in getEpochToPropose, i.e., before anyone LearnerHandler passes the getEpochToPropose barrier.

          The fix is done as part of ZK-1264

            Activity

            Hide
            Permalink
            Hudson added a comment -

            Integrated in ZooKeeper-trunk #1357 (See https://builds.apache.org/job/ZooKeeper-trunk/1357/)
            ZOOKEEPER-1264. FollowerResyncConcurrencyTest failing intermittently.
            ZOOKEEPER-1282. Learner.java not following Zab 1.0 protocol - setCurrentEpoch should be done upon receipt of NEWLEADER (before acking it) and not upon receipt of UPTODATE.
            ZOOKEEPER-1291. AcceptedEpoch not updated at leader before it proposes the epoch to followers.

            camille : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1198053
            Files :

            • /zookeeper/trunk/CHANGES.txt
            • /zookeeper/trunk/src/java/main/org/apache/zookeeper/server/quorum/Leader.java
            • /zookeeper/trunk/src/java/main/org/apache/zookeeper/server/quorum/Learner.java
            • /zookeeper/trunk/src/java/test/org/apache/zookeeper/server/quorum/Zab1_0Test.java
            • /zookeeper/trunk/src/java/test/org/apache/zookeeper/test/FollowerResyncConcurrencyTest.java
            Show
            Hudson added a comment - Integrated in ZooKeeper-trunk #1357 (See https://builds.apache.org/job/ZooKeeper-trunk/1357/ ) ZOOKEEPER-1264 . FollowerResyncConcurrencyTest failing intermittently. ZOOKEEPER-1282 . Learner.java not following Zab 1.0 protocol - setCurrentEpoch should be done upon receipt of NEWLEADER (before acking it) and not upon receipt of UPTODATE. ZOOKEEPER-1291 . AcceptedEpoch not updated at leader before it proposes the epoch to followers. camille : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1198053 Files : /zookeeper/trunk/CHANGES.txt /zookeeper/trunk/src/java/main/org/apache/zookeeper/server/quorum/Leader.java /zookeeper/trunk/src/java/main/org/apache/zookeeper/server/quorum/Learner.java /zookeeper/trunk/src/java/test/org/apache/zookeeper/server/quorum/Zab1_0Test.java /zookeeper/trunk/src/java/test/org/apache/zookeeper/test/FollowerResyncConcurrencyTest.java

              People

              • Assignee:
                Alexander Shraer
                Reporter:
                Alexander Shraer
              • Votes:
                0 Vote for this issue
                Watchers:
                0 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved:

                  Development