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

["Matthias Gabriel (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-2729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17472112#comment-17472112 ] 

Matthias Gabriel commented on KAFKA-2729:
-----------------------------------------

Hey [~junrao],

We also have the same issue recurring once a week in version 1.1.0, which is marked as the "Fix version".

We run a cluster with 3 Kafka Brokers:

Node-1

 
{code:java}
[2021-12-31 19:12:23,540] INFO [Partition topicXYZ-1 broker=1] Shrinking ISR from 5,3,1 to 5,1 (kafka.cluster.Partition)
[2021-12-31 19:12:23,544] INFO [Partition topicXYZ-1 broker=1] Cached zkVersion [326] not equal to that in zookeeper, skip updating ISR (kafka.cluster.Partition){code}
 

On Node-2 we do not see any related message for the timeperiod

On Node-3 we have the following message, which we are not sure if its related at all.
{code:java}
2021-12-31 19:12:23,541 [myid:3] - INFO  [ProcessThread(sid:3 cport:-1)::PrepRequestProcessor@653] - Got user-level KeeperException when processing sessionid:0x1004521e6ed0000 type:setData cxid:0xbca4 zxid:0x3a40000a372 txntype:-1 reqpath:n/a Error Path:/brokers/topics/topicXYZ/partitions/1/state Error:KeeperErrorCode = BadVersion for /brokers/topics/topicXYZ/partitions/1/state{code}
Do you have any idea what we could do or which data we could deliver to give you additional insights?

Thanks
Matthias

> 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, 2.4.1
>            Reporter: Danil Serdyuchenko
>            Assignee: Onur Karaman
>            Priority: Critical
>             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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