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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