davsclaus opened a new pull request, #25791: URL: https://github.com/apache/camel/pull/25791
## Backport of #25611 Cherry-pick of #25611 onto `camel-4.18.x`. **Original PR:** #25611 - CAMEL-24457: Fix ZooKeeper cluster split-brain on leader isolation **Original author:** @mustafaAlmonayer **Target branch:** `camel-4.18.x` ### Original description ZooKeeperClusterView.CamelLeaderElectionListener.takeLeadership() fired its leadership-lost event while Curator's hasLeadership() still returned true, since the event fired from inside takeLeadership() before Curator's internals had flipped leadership state. This caused ClusteredRoutePolicy to see no leadership change and keep the route running on a node that had lost its ZooKeeper session, while a healthy node elected a new leader and started the same route — a split-brain with duplicate message processing. Track leadership state in a view-owned volatile flag instead of delegating to leaderSelector.hasLeadership(), set it before firing the leadership-gained/lost events in takeLeadership()'s try/finally, and close (not just interrupt) the LeaderSelector in doStop() so a deliberate stop cannot race an auto-requeue. autoRequeue() is enabled in doStart() so the node re-enters the election after ZooKeeper reconnects. Adds ZooKeeperClusterViewLeadershipLostIT to exercise the split-brain scenario end-to-end: acquire leadership, lose it on ZK session loss, and reclaim it after reconnect. Closes #25611 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
