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https://issues.apache.org/jira/browse/KAFKA-9212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16990971#comment-16990971
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ASF GitHub Bot commented on KAFKA-9212:
---------------------------------------

ijuma commented on pull request #7795: KAFKA-9212; Ensure LeaderAndIsr state 
updated in controller context during reassignment
URL: https://github.com/apache/kafka/pull/7795
 
 
   
 
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> Keep receiving FENCED_LEADER_EPOCH while sending ListOffsetRequest
> ------------------------------------------------------------------
>
>                 Key: KAFKA-9212
>                 URL: https://issues.apache.org/jira/browse/KAFKA-9212
>             Project: Kafka
>          Issue Type: Bug
>          Components: consumer, offset manager
>    Affects Versions: 2.3.0, 2.3.1
>         Environment: Linux
>            Reporter: Yannick
>            Assignee: Jason Gustafson
>            Priority: Blocker
>             Fix For: 2.4.0, 2.3.2
>
>
> When running Kafka connect s3 sink connector ( confluent 5.3.0), after one 
> broker got restarted (leaderEpoch updated at this point), the connect worker 
> crashed with the following error : 
> [2019-11-19 16:20:30,097] ERROR [Worker clientId=connect-1, 
> groupId=connect-ls] Uncaught exception in herder work thread, exiting: 
> (org.apache.kafka.connect.runtime.distributed.DistributedHerder:253)
>  org.apache.kafka.common.errors.TimeoutException: Failed to get offsets by 
> times in 30003ms
>  
> After investigation, it seems it's because it got fenced when sending 
> ListOffsetRequest in loop and then got timed out , as follows :
> [2019-11-19 16:20:30,020] DEBUG [Consumer clientId=consumer-3, 
> groupId=connect-ls] Sending ListOffsetRequest (type=ListOffsetRequest, 
> replicaId=-1, partitionTimestamps={connect_ls_config-0={timestamp: -1, 
> maxNumOffsets: 1, currentLeaderEpoch: Optional[1]}}, 
> isolationLevel=READ_UNCOMMITTED) to broker kafka6.fra2.internal:9092 (id: 4 
> rack: null) (org.apache.kafka.clients.consumer.internals.Fetcher:905)
> [2019-11-19 16:20:30,044] DEBUG [Consumer clientId=consumer-3, 
> groupId=connect-ls] Attempt to fetch offsets for partition 
> connect_ls_config-0 failed due to FENCED_LEADER_EPOCH, retrying. 
> (org.apache.kafka.clients.consumer.internals.Fetcher:985)
>  
> The above happens multiple times until timeout.
>  
> According to the debugs, the consumer always get a leaderEpoch of 1 for this 
> topic when starting up :
>  
>  [2019-11-19 13:27:30,802] DEBUG [Consumer clientId=consumer-3, 
> groupId=connect-ls] Updating last seen epoch from null to 1 for partition 
> connect_ls_config-0 (org.apache.kafka.clients.Metadata:178)
>   
>   
>  But according to our brokers log, the leaderEpoch should be 2, as follows :
>   
>  [2019-11-18 14:19:28,988] INFO [Partition connect_ls_config-0 broker=4] 
> connect_ls_config-0 starts at Leader Epoch 2 from offset 22. Previous Leader 
> Epoch was: 1 (kafka.cluster.Partition)
>   
>   
>  This make impossible to restart the worker as it will always get fenced and 
> then finally timeout.
>   
>  It is also impossible to consume with a 2.3 kafka-console-consumer as 
> follows :
>   
>  kafka-console-consumer --bootstrap-server BOOTSTRAPSERVER:9092 --topic 
> connect_ls_config --from-beginning 
>   
>  the above will just hang forever ( which is not expected cause there is 
> data) and we can see those debug messages :
> [2019-11-19 22:17:59,124] DEBUG [Consumer clientId=consumer-1, 
> groupId=console-consumer-3844] Attempt to fetch offsets for partition 
> connect_ls_config-0 failed due to FENCED_LEADER_EPOCH, retrying. 
> (org.apache.kafka.clients.consumer.internals.Fetcher)
>   
>   
>  Interesting fact, if we do subscribe the same way with kafkacat (1.5.0) we 
> can consume without problem ( must be the way kafkacat is consuming ignoring 
> FENCED_LEADER_EPOCH):
>   
>  kafkacat -b BOOTSTRAPSERVER:9092 -t connect_ls_config -o beginning
>   
>   



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