Luigi Tagliamonte created KAFKA-7488: ----------------------------------------
Summary: Controller not recovering after disconnection to zookeeper Key: KAFKA-7488 URL: https://issues.apache.org/jira/browse/KAFKA-7488 Project: Kafka Issue Type: Bug Components: controller Affects Versions: 1.1.0 Reporter: Luigi Tagliamonte This issue seems related to https://issues.apache.org/jira/browse/KAFKA-2729 that has been resolved here https://issues.apache.org/jira/browse/KAFKA-2729 The issue still exists in Kafka 1.1 Cluster details: * 3 Kafka nodes cluster running 1.1 * 3 Zookeeper node cluster running 3.4.10 Today meanwhile I was replacing a zookeeper server the leader among the brokers experienced this issue: {code:java} [2018-10-05 21:03:02,799] INFO [GroupMetadataManager brokerId=1] Removed 0 expired offsets in 0 milliseconds. (kafka.coordinator.group.GroupMetadataManager) [2018-10-05 21:08:20,060] INFO Unable to read additional data from server sessionid 0x34663b434985000e, likely server has closed socket, closing socket connection and attempting reconnect (org.apache.zookeeper.ClientCnxn) [2018-10-05 21:08:21,001] INFO Opening socket connection to server 10.48.208.70/10.48.208.70:2181. Will not attempt to authenticate using SASL (unknown error) (org.apache.zookeeper.ClientCnxn) [2018-10-05 21:08:21,003] WARN Session 0x34663b434985000e for server null, unexpected error, closing socket connection and attempting reconnect (org.apache.zookeeper.ClientCnxn) java.net.ConnectException: Connection refused at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361) at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1141) [2018-10-05 21:08:21,797] INFO Opening socket connection to server 10.48.210.44/10.48.210.44:2181. Will not attempt to authenticate using SASL (unknown error) (org.apache.zookeeper.ClientCnxn) [2018-10-05 21:08:21,799] INFO Socket connection established to 10.48.210.44/10.48.210.44:2181, initiating session (org.apache.zookeeper.ClientCnxn) [2018-10-05 21:08:21,802] INFO Session establishment complete on server 10.48.210.44/10.48.210.44:2181, sessionid = 0x34663b434985000e, negotiated timeout = 6000 (org.apache.zookeeper.ClientCnxn) [2018-10-05 21:08:28,015] INFO Creating /controller (is it secure? false) (kafka.zk.KafkaZkClient) [2018-10-05 21:08:28,015] INFO Creating /controller (is it secure? false) (kafka.zk.KafkaZkClient) [2018-10-05 21:08:28,025] ERROR Error while creating ephemeral at /controller, node already exists and owner '3703712903740981258' does not match current session '3775770497779040270' (kafka.zk.KafkaZkClient$CheckedEphemeral) [2018-10-05 21:08:28,025] ERROR Error while creating ephemeral at /controller, node already exists and owner '3703712903740981258' does not match current session '3775770497779040270' (kafka.zk.KafkaZkClient$CheckedEphemeral) [2018-10-05 21:08:28,025] INFO Result of znode creation at /controller is: NODEEXISTS (kafka.zk.KafkaZkClient) [2018-10-05 21:08:28,025] INFO Result of znode creation at /controller is: NODEEXISTS (kafka.zk.KafkaZkClient) [2018-10-05 21:08:42,561] INFO [Partition <PT_NAME>-store-changelog-7 broker=1] Shrinking ISR from 2,1,3 to 1 (kafka.cluster.Partition) [2018-10-05 21:08:42,561] INFO [Partition <PT_NAME>-store-changelog-7 broker=1] Shrinking ISR from 2,1,3 to 1 (kafka.cluster.Partition) [2018-10-05 21:08:42,569] INFO [Partition <PT_NAME>-store-changelog-7 broker=1] Cached zkVersion [11] not equal to that in zookeeper, skip updating ISR (kafka.cluster.Partition) [2018-10-05 21:08:42,569] INFO [Partition <PT_NAME>-store-changelog-7 broker=1] Cached zkVersion [11] not equal to that in zookeeper, skip updating ISR (kafka.cluster.Partition) [2018-10-05 21:08:42,569] INFO [Partition <PT_NAME>bycontact_0-19 broker=1] Shrinking ISR from 2,1,3 to 1 (kafka.cluster.Partition) [2018-10-05 21:08:42,569] INFO [Partition <PT_NAME>bycontact_0-19 broker=1] Shrinking ISR from 2,1,3 to 1 (kafka.cluster.Partition) [2018-10-05 21:08:42,574] INFO [Partition <PT_NAME>bycontact_0-19 broker=1] Cached zkVersion [44] not equal to that in zookeeper, skip updating ISR (kafka.cluster.Partition) [2018-10-05 21:08:42,574] INFO [Partition <PT_NAME>bycontact_0-19 broker=1] Cached zkVersion [44] not equal to that in zookeeper, skip updating ISR (kafka.cluster.Partition){code} The only way in order to recover was to restart the broker. -- This message was sent by Atlassian JIRA (v7.6.3#76005)