Hello all,

I got the following exception in my Kafka consumer:
2019-03-06 10:53:34,416 WARN [LogContext.java:246] [Consumer 
clientId=ContractComputerConsumer_prod-8, groupId=consumer_2] Error while 
fetching metadata with correlation id 22904 : 
{topic1_prod=UNKNOWN_TOPIC_OR_PARTITION}


I checked, all my zookeeper instance is avaible and same state for my Kafka 
brokers.
however I see for topic description:
Topic:contract_prod PartitionCount:1 ReplicationFactor:3 Configs:
Topic: contract_prod Partition: 0 Leader: 1 Replicas: 4,1,2 Isr: 1,2

the '4' replica should not be in Isr ?

I can see that in Kafka '4' broker logs:
[2019-03-07 13:38:11,486] WARN [Replica Manager on Broker 4]: While recording 
the replica LEO, the partition topic4_prod-0 hasn't been created. 
(kafka.server.ReplicaManager)
[2019-03-07 13:38:11,486] WARN [Replica Manager on Broker 4]: While recording 
the replica LEO, the partition topic3_prod-0 hasn't been created. 
(kafka.server.ReplicaManager)
[2019-03-07 13:38:11,486] WARN [Replica Manager on Broker 4]: While recording 
the replica LEO, the partition topic2_prod-0 hasn't been created. 
(kafka.server.ReplicaManager)
[2019-03-07 13:38:11,464] ERROR [ReplicaFetcherThread-0-1], Error for partition 
[__consumer_offsets,5] to broker 
1:org.apache.kafka.common.errors.NotLeaderForPartitionException: This server is 
not the leader for that topic-partition. (kafka.server.ReplicaFetcherThread)

And several following error in other Kafka broker:
[2019-03-07 13:39:55,826] ERROR [ReplicaFetcherThread-0-2], Error for partition 
[__consumer_offsets,46] to broker 
2:org.apache.kafka.common.errors.NotLeaderForPartitionException: This server is 
not the leader for that topic-partition. (kafka.server.ReplicaFetcherThread)


Also found the following log trace in :
[2018-12-07 14:13:27,722] WARN [Controller-2-to-broker-2-send-thread], 
Controller 2's connection to broker broker2:9092 (id: 2 rack: null) was 
unsuccessful (kafka.controller.RequestSendThread)
java.io.IOException: Connection to broker2:9092 (id: 2 rack: null) failed
at 
kafka.utils.NetworkClientBlockingOps$.awaitReady$1(NetworkClientBlockingOps.scala:8


Do you have an idea of the problem ? how can I restore the situation please? 
this is a production environment.

Thank if anyone can help me please ...

Best regards Adrien

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