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https://issues.apache.org/jira/browse/KAFKA-2729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15937468#comment-15937468
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Stephane Maarek commented on KAFKA-2729:
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If I may add, this is a pretty bad issue, but it got worse. You not only have
to recover Kafka, but also recover your Kafka Connect ClusterS. They got stuck
for me in the following state:
[2017-03-23 00:06:05,478] INFO Marking the coordinator kafka-1:9092 (id:
2147483626 rack: null) dead for group connect-MyConnector
(org.apache.kafka.clients.consumer.internals.AbstractCoordinator)
[2017-03-23 00:06:05,478] INFO Marking the coordinator kafka-1:9092 (id:
2147483626 rack: null) dead for group connect-MyConnector
(org.apache.kafka.clients.consumer.internals.AbstractCoordinator)
> 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
> Reporter: Danil Serdyuchenko
>
> 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.
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