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https://issues.apache.org/jira/browse/KAFKA-5415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16043741#comment-16043741
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Apurva Mehta commented on KAFKA-5415:
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Incriminating evidence from the logs.
1. Tail of the transaction log is PrepareCommit at offset 277
{noformat}
offset: 276 position: 46886 CreateTime: 1496957141444 isvalid: true keysize: 29
valuesize: 95 magic: 2 compresscodec: NONE producerId: -1 sequence: -1
isTransactional: false headerKeys: [] key:
transactionalId=my-first-transactional-id payload:
producerId:2000,producerEpoch:0,state=Ongoing,partitions=Set(output-topic-2,
__consumer_offsets-47, output-topic-0,
output-topic-1),lastUpdateTimestamp=1496957141444
offset: 277 position: 47080 CreateTime: 1496957141285 isvalid: true keysize: 29
valuesize: 95 magic: 2 compresscodec: NONE producerId: -1 sequence: -1
isTransactional: false headerKeys: [] key:
transactionalId=my-first-transactional-id payload:
producerId:2000,producerEpoch:0,state=PrepareCommit,partitions=Set(output-topic-2,
__consumer_offsets-47, output-topic-0,
output-topic-1),lastUpdateTimestamp=1496957141285
{noformat}
2. The client disconnected from the coordinator after sending the EndTxn request
{noformat}
[2017-06-08 21:25:41,474] TRACE Produced messages to topic-partition
output-topic-2 with base offset offset 28618 and error: null.
(org.apache.kafka.clients.producer.internals.ProducerBatch)
[2017-06-08 21:25:41,474] TRACE [TransactionalId my-first-transactional-id]
Request (type=EndTxnRequest, transactionalId=my-first-transactional-id,
producerId=2000, producerEpoch=0, result=COMMIT) dequeued for sending
(org.apache.kafka.clients.producer.internals.TransactionManager)
[2017-06-08 21:25:41,474] DEBUG [TransactionalId my-first-transactional-id]
Sending transactional request (type=EndTxnRequest,
transactionalId=my-first-transactional-id, producerId=2000, producerEpoch=0,
result=COMMIT) to node worker12:9092 (id: 3 rack: null)
(org.apache.kafka.clients.producer.internals.Sender)
[2017-06-08 21:26:11,533] DEBUG [TransactionalId my-first-transactional-id]
Disconnected from 3. Will retry.
(org.apache.kafka.clients.producer.internals.TransactionManager)
[2017-06-08 21:26:11,533] DEBUG [TransactionalId my-first-transactional-id]
Enqueuing transactional request (type=FindCoordinatorRequest,
coordinatorKey=my-first-transactional-id, coordinatorType=TRANSACTION)
(org.apache.kafka.clients.producer.internals.TransactionManager)
[2017-06-08 21:26:11,533] DEBUG [TransactionalId my-first-transactional-id]
Enqueuing transactional request (type=EndTxnRequest,
transactionalId=my-first-transactional-id, producerId=2000, producerEpoch=0,
result=COMMIT) (org.apache.kafka.clients.producer.internals.TransactionManager)
[2017-06-08 21:26:11,533] TRACE [TransactionalId my-first-transactional-id]
Request (type=FindCoordinatorRequest, coordinatorKey=my-first-transactional-id,
coordinatorType=TRANSACTION) dequeued for sending
(org.apache.kafka.clients.producer.internals.TransactionManager)
[2017-06-08 21:26:11,534] DEBUG [TransactionalId my-first-transactional-id]
Sending transactional request (type=FindCoordinatorRequest,
coordinatorKey=my-first-transactional-id, coordinatorType=TRANSACTION) to node
worker5:9092 (id: 2 rack: null)
(org.apache.kafka.clients.producer.internals.Sender)
[2017-06-08 21:26:11,535] TRACE [TransactionalId my-first-transactional-id]
Received transactional response FindCoordinatorResponse(throttleTimeMs=0,
errorMessage='null', error=NONE, node=worker12:9092 (id: 3 rack: null)) for
request (type=FindCoordinatorRequest, coordinatorKey=my-first-transactional-id,
coordinatorType=TRANSACTION)
(org.apache.kafka.clients.producer.internals.TransactionManager)
[2017-06-08 21:26:11,535] TRACE [TransactionalId my-first-transactional-id]
Request (type=EndTxnRequest, transactionalId=my-first-transactional-id,
producerId=2000, producerEpoch=0, result=COMMIT) dequeued for sending
(org.apache.kafka.clients.producer.internals.TransactionManager)
[2017-06-08 21:26:11,535] DEBUG [TransactionalId my-first-transactional-id]
Disconnect from worker12:9092 (id: 3 rack: null) while trying to send request
(type=EndTxnRequest, transactionalId=my-first-transactional-id,
producerId=2000, producerEpoch=0, result=COMMIT). Going to back off and retry
(org.apache.kafka.clients.producer.internals.Sender)
[2017-06-08 21:26:11,535] DEBUG [TransactionalId my-first-transactional-id]
Enqueuing transactional request (type=FindCoordinatorRequest,
coordinatorKey=my-first-transactional-id, coordinatorType=TRANSACTION)
(org.apache.kafka.clients.producer.internals.TransactionManager)
[2017-06-08 21:26:11,535] DEBUG [TransactionalId my-first-transactional-id]
Enqueuing transactional request (type=EndTxnRequest,
transactionalId=my-first-transactional-id, producerId=2000, producerEpoch=0,
result=COMMIT) (org.apache.kafka.clients.prod
