[jira] [Resolved] (KAFKA-2729) Cached zkVersion not equal to that in zookeeper, broker not recovering.

["Ismael Juma (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-2729?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ismael Juma resolved KAFKA-2729.
--------------------------------
       Resolution: Fixed
         Assignee: Onur Karaman
    Fix Version/s: 1.1.0

We believe this is fixed in trunk (to become 1.1.0). If someone sees this again with that version, please reopen.

> 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
>             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.



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