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From "derek (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-2729) Cached zkVersion not equal to that in zookeeper, broker not recovering.
Date Wed, 23 Nov 2016 15:32:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-2729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15690420#comment-15690420
] 

derek commented on KAFKA-2729:
------------------------------

I'm on 0.10.1.0 and seeing the same thing. Maybe related to [~cmolter] is saying above, what
we see in the logs just prior to a broker becoming under-replicated is a flurry of

{noformat}
org.apache.kafka.common.errors.NotLeaderForPartitionException: This server is not the leader
for that topic-partition.
{noformat}

messages. After that we see a bunch of activity around adding and removing fetchers, then
it goes into the infinite ISR shrink loop. The only way we can recover is to restart.

> 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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