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Jun Rao commented on KAFKA-2729: -------------------------------- [~murri71], my earlier comment was referring to that we fixed the following issue in KAFKA-7165. It's possible that issue may suffice "Cached zkVersion" in some scenarios. I am not sure if there are other issues that can still lead to "Cached zkVersion". So, my recommendation is to upgrade to 2.2 when it's released and file a separate Jira if the issue still exists. [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) > Cached zkVersion not equal to that in zookeeper, broker not recovering. > ----------------------------------------------------------------------- > > Key: KAFKA-2729 > URL: https://issues.apache.org/jira/browse/KAFKA-2729 > Project: Kafka > Issue Type: Bug > Affects Versions: 0.8.2.1, 0.9.0.0, 0.10.0.0, 0.10.1.0, 0.11.0.0 > Reporter: Danil Serdyuchenko > Assignee: Onur Karaman > Priority: Major > Fix For: 1.1.0 > > > After a small network wobble where zookeeper nodes couldn't reach each other, > we started seeing a large number of undereplicated partitions. The zookeeper > cluster recovered, however we continued to see a large number of > undereplicated partitions. Two brokers in the kafka cluster were showing this > in the logs: > {code} > [2015-10-27 11:36:00,888] INFO Partition > [__samza_checkpoint_event-creation_1,3] on broker 5: Shrinking ISR for > partition [__samza_checkpoint_event-creation_1,3] from 6,5 to 5 > (kafka.cluster.Partition) > [2015-10-27 11:36:00,891] INFO Partition > [__samza_checkpoint_event-creation_1,3] on broker 5: Cached zkVersion [66] > not equal to that in zookeeper, skip updating ISR (kafka.cluster.Partition) > {code} > For all of the topics on the effected brokers. Both brokers only recovered > after a restart. Our own investigation yielded nothing, I was hoping you > could shed some light on this issue. Possibly if it's related to: > https://issues.apache.org/jira/browse/KAFKA-1382 , however we're using > 0.8.2.1. -- This message was sent by Atlassian JIRA (v7.6.3#76005)