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Posted to dev@kafka.apache.org by "Apurva Mehta (JIRA)" <ji...@apache.org> on 2017/06/09 01:00:39 UTC
[jira] [Comment Edited] (KAFKA-5415) TransactionCoordinator gets
stuck in PrepareCommit state
[ https://issues.apache.org/jira/browse/KAFKA-5415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16043741#comment-16043741 ]
Apurva Mehta edited comment on KAFKA-5415 at 6/9/17 12:59 AM:
--------------------------------------------------------------
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, and got 'CONCURRENT_TRANSACTIONS' on retry.
{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.producer.internals.TransactionManager)
[2017-06-08 21:26:11,636] 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 21:26:11,636] DEBUG [TransactionalId my-first-transactional-id] Sending transactional request (type=FindCoordinatorRequest, coordinatorKey=my-first-transactional-id, coordinatorType=TRANSACTION) to node worker1:9092 (id: 1 rack: null) (org.apache.kafka.clients.producer.internals.Sender)
[2017-06-08 21:26:11,637] 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 21:26:11,637] 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 21:26:11,739] 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 21:26:11,739] TRACE [TransactionalId my-first-transactional-id] Received transactional response EndTxnResponse(error=CONCURRENT_TRANSACTIONS, throttleTimeMs=0) for request (type=EndTxnRequest, transactionalId=my-first-transactional-id, producerId=2000, producerEpoch=0, result=COMMIT) (org.apache.kafka.clients.producer.internals.TransactionManager)
[2017-06-08 21:26:11,739] 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 21:26:11,739] 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 21:26:11,840] 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 21:26:11,840] TRACE [TransactionalId my-first-transactional-id] Received transactional response EndTxnResponse(error=CONCURRENT_TRANSACTIONS, throttleTimeMs=0) for request (type=EndTxnRequest, transactionalId=my-first-transactional-id, producerId=2000, producerEpoch=0, result=COMMIT) (org.apache.kafka.clients.producer.internals.TransactionManager)
[2017-06-08 21:26:11,840] 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)
{noformat}
3. Last message in the coordinator for the transactional id in question indicates a transition to PrepareCommit
{noformat}
[2017-06-08 21:25:41,449] DEBUG [Transaction Log Manager 3]: Updating my-first-transactional-id's transaction state to TxnTransitMetadata(producerId=2000, producerEpoch=0, txnTimeoutMs=60000, txnState=Ongoing, topicPartitions=Set(output-topic-2, __consumer_offsets-47, output-topic-0, output-topic-1), txnStartTimestamp=1496957141430, txnLastUpdateTimestamp=1496957141444) with coordinator epoch 3 for my-first-transactional-id succeeded (kafka.coordinator.transaction.TransactionStateManager)
[2017-06-08 21:25:41,285] DEBUG TransactionalId my-first-transactional-id prepare transition from Ongoing to TxnTransitMetadata(producerId=2000, producerEpoch=0, txnTimeoutMs=60000, txnState=PrepareCommit, topicPartitions=Set(output-topic-2, __consumer_offsets-47, output-topic-0, output-topic-1), txnStartTimestamp=1496957141430, txnLastUpdateTimestamp=1496957141285) (kafka.coordinator.transaction.TransactionMetadata)
{noformat}
4. The high water mark for the transaction log partition was updated to 278, indicating that the append callback must have been invoked.
{noformat}
[2017-06-08 21:25:41,291] DEBUG Partition [__transaction_state,41] on broker 3: Recorded replica 2 log end offset (LEO) position 278 for partition __transaction_state-41. (kafka.cluster.Partition)
[2017-06-08 21:25:41,291] DEBUG Partition [__transaction_state,41] on broker 3: High watermark for partition [__transaction_state,41] updated to 278 [0 : 47274] (kafka.cluster.Partition)
{noformat}
was (Author: apurva):
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, and got 'CONCURRENT_TRANSACTIONS' on retry.
{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.producer.internals.TransactionManager)
[2017-06-08 21:26:11,636] 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 21:26:11,636] DEBUG [TransactionalId my-first-transactional-id] Sending transactional request (type=FindCoordinatorRequest, coordinatorKey=my-first-transactional-id, coordinatorType=TRANSACTION) to node worker1:9092 (id: 1 rack: null) (org.apache.kafka.clients.producer.internals.Sender)
[2017-06-08 21:26:11,637] 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 21:26:11,637] 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 21:26:11,739] 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 21:26:11,739] TRACE [TransactionalId my-first-transactional-id] Received transactional response EndTxnResponse(error=CONCURRENT_TRANSACTIONS, throttleTimeMs=0) for request (type=EndTxnRequest, transactionalId=my-first-transactional-id, producerId=2000, producerEpoch=0, result=COMMIT) (org.apache.kafka.clients.producer.internals.TransactionManager)
[2017-06-08 21:26:11,739] 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 21:26:11,739] 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 21:26:11,840] 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 21:26:11,840] TRACE [TransactionalId my-first-transactional-id] Received transactional response EndTxnResponse(error=CONCURRENT_TRANSACTIONS, throttleTimeMs=0) for request (type=EndTxnRequest, transactionalId=my-first-transactional-id, producerId=2000, producerEpoch=0, result=COMMIT) (org.apache.kafka.clients.producer.internals.TransactionManager)
[2017-06-08 21:26:11,840] 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)
{noformat}
3. Last message in the coordinator for the transactional id in question indicates a transition to PrepareCommit
{noformat}
[2017-06-08 21:25:41,449] DEBUG [Transaction Log Manager 3]: Updating my-first-transactional-id's transaction state to TxnTransitMetadata(producerId=2000, producerEpoch=0, txnTimeoutMs=60000, txnState=Ongoing, topicPartitions=Set(output-topic-2, __consumer_offsets-47, output-topic-0, output-topic-1), txnStartTimestamp=1496957141430, txnLastUpdateTimestamp=1496957141444) with coordinator epoch 3 for my-first-transactional-id succeeded (kafka.coordinator.transaction.TransactionStateManager)
[2017-06-08 21:25:41,285] DEBUG TransactionalId my-first-transactional-id prepare transition from Ongoing to TxnTransitMetadata(producerId=2000, producerEpoch=0, txnTimeoutMs=60000, txnState=PrepareCommit, topicPartitions=Set(output-topic-2, __consumer_offsets-47, output-topic-0, output-topic-1), txnStartTimestamp=1496957141430, txnLastUpdateTimestamp=1496957141285) (kafka.coordinator.transaction.TransactionMetadata)
{noformat}
4. The high water mark for the transaction log partition was updated to 278, indicating that the append callback must have been invoked.
{noformat}
[2017-06-08 21:25:41,449] DEBUG [Transaction Log Manager 3]: Updating my-first-transactional-id's transaction state to TxnTransitMetadata(producerId=2000, producerEpoch=0, txnTimeoutMs=60000, txnState=Ongoing, topicPartitions=Set(output-topic-2, __consumer_offsets-47, output-topic-0, output-topic-1), txnStartTimestamp=1496957141430, txnLastUpdateTimestamp=1496957141444) with coordinator epoch 3 for my-first-transactional-id succeeded (kafka.coordinator.transaction.TransactionStateManager)
[2017-06-08 21:25:41,285] DEBUG TransactionalId my-first-transactional-id prepare transition from Ongoing to TxnTransitMetadata(producerId=2000, producerEpoch=0, txnTimeoutMs=60000, txnState=PrepareCommit, topicPartitions=Set(output-topic-2, __consumer_offsets-47, output-topic-0, output-topic-1), txnStartTimestamp=1496957141430, txnLastUpdateTimestamp=1496957141285) (kafka.coordinator.transaction.TransactionMetadata)
{noformat}
> TransactionCoordinator gets stuck in PrepareCommit state
> --------------------------------------------------------
>
> Key: KAFKA-5415
> URL: https://issues.apache.org/jira/browse/KAFKA-5415
> Project: Kafka
> Issue Type: Bug
> Reporter: Apurva Mehta
> Assignee: Apurva Mehta
> Priority: Blocker
> Labels: exactly-once
> Fix For: 0.11.0.0
>
> Attachments: 6.tgz
>
>
> This has been revealed by the system test failures on jenkins.
> The transaction coordinator seems to get into a path during the handling of the EndTxnRequest where it returns an error (possibly a NOT_COORDINATOR or COORDINATOR_NOT_AVAILABLE error, to be revealed by https://github.com/apache/kafka/pull/3278) to the client. However, due to network instability, the producer is disconnected before it receives this error.
> As a result, the transaction remains in a `PrepareXX` state, and future `EndTxn` requests sent by the client after reconnecting result in a `CONCURRENT_TRANSACTION` error code. Hence the client gets stuck and the transaction never finishes, as expiration isn't done from a PrepareXX state.
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