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https://issues.apache.org/jira/browse/KAFKA-2729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16203749#comment-16203749
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Francesco vigotti commented on KAFKA-2729:
------------------------------------------

After having lost 2 days on this I've reset whole cluster, stopped all kafka 
brokers, stopped zookeeper cluster, delete all directories,stopped all consumer 
and producer ,then restarted everything , recreated topics and now guess what? 
:)

one node reports... 
{code:java}

[2017-10-13 15:54:52,893] INFO Partition [__consumer_offsets,5] on broker 2: 
Expanding ISR for partition __consumer_offsets-5 from 10,13,2 to 10,13,2,5 
(kafka.cluster.Partition)
[2017-10-13 15:54:52,906] INFO Partition [__consumer_offsets,5] on broker 2: 
Cached zkVersion [13] not equal to that in zookeeper, skip updating ISR 
(kafka.cluster.Partition)
[2017-10-13 15:54:52,908] INFO Partition [__consumer_offsets,25] on broker 2: 
Expanding ISR for partition __consumer_offsets-25 from 10,2,13 to 10,2,13,5 
(kafka.cluster.Partition)
[2017-10-13 15:54:52,915] INFO Partition [__consumer_offsets,25] on broker 2: 
Cached zkVersion [10] not equal to that in zookeeper, skip updating ISR 
(kafka.cluster.Partition)
[2017-10-13 15:54:52,916] INFO Partition [__consumer_offsets,45] on broker 2: 
Expanding ISR for partition __consumer_offsets-45 from 10,13,2 to 10,13,2,5 
(kafka.cluster.Partition)
[2017-10-13 15:54:52,925] INFO Partition [__consumer_offsets,45] on broker 2: 
Cached zkVersion [15] not equal to that in zookeeper, skip updating ISR 
(kafka.cluster.Partition)
[2017-10-13 15:54:52,926] INFO Partition [__consumer_offsets,5] on broker 2: 
Expanding ISR for partition __consumer_offsets-5 from 10,13,2 to 10,13,2,5 
(kafka.cluster.Partition)
[2017-10-13 15:54:52,936] INFO Partition [__consumer_offsets,5] on broker 2: 
Cached zkVersion [13] not equal to that in zookeeper, skip updating ISR 
(kafka.cluster.Partition)
[2017-10-13 15:54:52,939] INFO Partition [__consumer_offsets,25] on broker 2: 
Expanding ISR for partition __consumer_offsets-25 from 10,2,13 to 10,2,13,5 
(kafka.cluster.Partition)
{code}

while others 


{code:java}
[2017-10-13 15:57:08,128] ERROR [ReplicaFetcherThread-0-2], Error for partition 
[__consumer_offsets,40] to broker 
2:org.apache.kafka.common.errors.NotLeaderForPartitionException: This server is 
not the leader for that topic-partition. (kafka.server.ReplicaFetcherThread)
[2017-10-13 15:57:09,129] ERROR [ReplicaFetcherThread-0-2], Error for partition 
[__consumer_offsets,40] to broker 
2:org.apache.kafka.common.errors.NotLeaderForPartitionException: This server is 
not the leader for that topic-partition. (kafka.server.ReplicaFetcherThread)
[2017-10-13 15:57:10,260] ERROR [ReplicaFetcherThread-0-2], Error for partition 
[__consumer_offsets,40] to broker 
2:org.apache.kafka.common.errors.NotLeaderForPartitionException: This server is 
not the leader for that topic-partition. (kafka.server.ReplicaFetcherThread)
[2017-10-13 15:57:11,262] ERROR [ReplicaFetcherThread-0-2], Error for partition 
[__consumer_offsets,40] to broker 
2:org.apache.kafka.common.errors.NotLeaderForPartitionException: This server is 
not the leader for that topic-partition. (kafka.server.ReplicaFetcherThread)
[2017-10-13 15:57:12,265] ERROR [ReplicaFetcherThread-0-2], Error for partition 
[__consumer_offsets,40] to broker 
2:org.apache.kafka.common.errors.NotLeaderForPartitionException: This server is 
not the leader for that topic-partition. (kafka.server.ReplicaFetcherThread)
[2017-10-13 15:57:13,289] ERROR [ReplicaFetcherThread-0-2], Error fo
{code}


cluster still being inconsistent, I've also added 2 more nodes hoping in an 
increasing of stability but nothing, I don't know if something is wrong because 
if kafka do some kind of pre-flight checks during startup it does log nothing.. 
the only logs are those which have no sense because the leader should be 
re-elected when there are ISR available.. and there are 
I've started looking for an alternative software to  use, I'm trying to use 
kafka is so frustrating :(


> 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
>
> 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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