[jira] [Created] (FLINK-27848) ZooKeeperLeaderElectionDriver keeps writing leader information, using up zxid

["Xintong Song (Jira)" <ji...@apache.org>]

Xintong Song created FLINK-27848:
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             Summary: ZooKeeperLeaderElectionDriver keeps writing leader information, using up zxid
                 Key: FLINK-27848
                 URL: https://issues.apache.org/jira/browse/FLINK-27848
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Coordination
    Affects Versions: 1.14.4, 1.15.0
            Reporter: Xintong Song
            Assignee: Weijie Guo
             Fix For: 1.14.5, 1.15.1


After a leadership change, the new leader may keeps writing its information (which is identical) to ZK, causing the zxid on ZK quickly used up.

The problem is that, in {{ZooKeeperLeaderElectionDriver#retrieveLeaderInformationFromZooKeeper}}, {{leaderElectionEventHandler.onLeaderInformationChange(LeaderInformation.empty())}} is called no matter {{childData}} is {{null}} or not. In case of non-null, this will cause the driver keeps re-writing the leader information to ZK.

The problem is introduced in FLINK-24038, and only affects the legacy {{ZooKeeperHaServices}}. Thus, only 1.14 / 1.15 are affected.



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