Hi all, We have a kafka cluster with 10 servers. First 3 of them are set as controller and broker. All 10 servers are brokers. Rest seven servers are set as brokers. v3.7.0
In the controller.log file we always see that leader is changing. [2025-04-16 16:02:46,023] WARN [QuorumController id=1] *Renouncing the leadership due to a metadata log event. We were the leader at epoch 7614, but in the new epoch 7615, the leader is (none). Reverting to last stable offset 12960831. (org.apache.kafka.controller.QuorumController)* [2025-04-16 16:02:46,295] INFO [QuorumController id=1] processBrokerHeartbeat: event failed with NotControllerException in 90 microseconds. (org.apache.kafka.controller.QuorumController) [2025-04-16 16:02:46,515] INFO [QuorumController id=1] In the new epoch 7616, the leader is (none). (org.apache.kafka.controller.QuorumController) [2025-04-16 16:02:47,192] INFO [QuorumController id=1] processBrokerHeartbeat: event failed with NotControllerException in 59 microseconds. (org.apache.kafka.controller.QuorumController) [2025-04-16 16:02:47,193] INFO [QuorumController id=1] processBrokerHeartbeat: event failed with NotControllerException in 11 microseconds. (org.apache.kafka.controller.QuorumController) [2025-04-16 16:02:47,193] INFO [QuorumController id=1] processBrokerHeartbeat: event failed with NotControllerException in 5 microseconds. (org.apache.kafka.controller.QuorumController) [2025-04-16 16:02:47,193] INFO [QuorumController id=1] processBrokerHeartbeat: event failed with NotControllerException in 8 microseconds. (org.apache.kafka.controller.QuorumController) [2025-04-16 16:02:47,193] INFO [QuorumController id=1] processBrokerHeartbeat: event failed with NotControllerException in 5 microseconds. (org.apache.kafka.controller.QuorumController) [2025-04-16 16:02:47,193] INFO [QuorumController id=1] processBrokerHeartbeat: event failed with NotControllerException in 3 microseconds. (org.apache.kafka.controller.QuorumController) [2025-04-16 16:02:47,194] INFO [QuorumController id=1] processBrokerHeartbeat: event failed with NotControllerException in 14 microseconds. (org.apache.kafka.controller.QuorumController) [2025-04-16 16:02:47,194] INFO [QuorumController id=1] processBrokerHeartbeat: event failed with NotControllerException in 8 microseconds. (org.apache.kafka.controller.QuorumController) [2025-04-16 16:02:47,388] INFO [QuorumController id=1]* In the new epoch 7617, the leader is (none)*. (org.apache.kafka.controller.QuorumController) [2025-04-16 16:02:47,470] INFO [QuorumController id=1] *In the new epoch 7617, the leader is 2. *(org.apache.kafka.controller.QuorumController) [2025-04-16 16:02:47,741] INFO [QuorumController id=1] *processBrokerHeartbeat: event failed with NotControllerException in 38 microseconds.* (org.apache.kafka.controller.QuorumController) [2025-04-16 16:02:57,035] INFO [QuorumController id=1] *In the new epoch 7618, the leader is (none).* (org.apache.kafka.controller.QuorumController) [2025-04-16 16:02:57,089] INFO [QuorumController id=1] *In the new epoch 7619, the leader is (none)*. (org.apache.kafka.controller.QuorumController) [2025-04-16 16:02:57,122] INFO [QuorumController id=1]* In the new epoch 7619, the leader is 3*. (org.apache.kafka.controller.QuorumController) eth's are bind at 10gbit, no network errors are seen. What could be the cause of this error? regards yavuz
