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https://issues.apache.org/jira/browse/KAFKA-5154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15993408#comment-15993408
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Matthias J. Sax commented on KAFKA-5154:
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Thanks for reporting this [~Lukas Gemela]. I just double checked the code:
https://github.com/apache/kafka/blob/0.10.2.0/streams/src/main/java/org/apache/kafka/streams/processor/internals/StreamThread.java#L618-L619
A {{NullPointerException}} can only occur if {{task}} is {{null}} (if
{{records}} would be {{null}} this would have happened in line 617 already).
Thus, it seems, that there is no active task for a record. Not sure how this
could happen atm. What triggers your rebalance? How many topics do you process
and what it the number of partitions per topic?
> Kafka Streams throws NPE during rebalance
> -----------------------------------------
>
> Key: KAFKA-5154
> URL: https://issues.apache.org/jira/browse/KAFKA-5154
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.2.0
> Reporter: Lukas Gemela
>
> please see attached log, Kafka streams throws NullPointerException during
> rebalance, which is caught by our custom exception handler
> {noformat}
> 2017-04-30T17:44:17,675 INFO kafka-coordinator-heartbeat-thread | hades
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.coordinatorDead()
> @618 - Marking the coordinator 10.210.200.144:9092 (id: 2147483644 rack:
> null) dead for group hades
> 2017-04-30T17:44:27,395 INFO StreamThread-1
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.onSuccess()
> @573 - Discovered coordinator 10.210.200.144:9092 (id: 2147483644 rack: null)
> for group hades.
> 2017-04-30T17:44:27,941 INFO StreamThread-1
> org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.onJoinPrepare()
> @393 - Revoking previously assigned partitions [poseidonIncidentFeed-27,
> poseidonIncidentFeed-29, poseidonIncidentFeed-30, poseidonIncidentFeed-18]
> for group hades
> 2017-04-30T17:44:27,947 INFO StreamThread-1
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.sendJoinGroupRequest()
> @407 - (Re-)joining group hades
> 2017-04-30T17:44:48,468 INFO StreamThread-1
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.sendJoinGroupRequest()
> @407 - (Re-)joining group hades
> 2017-04-30T17:44:53,628 INFO StreamThread-1
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.sendJoinGroupRequest()
> @407 - (Re-)joining group hades
> 2017-04-30T17:45:09,587 INFO StreamThread-1
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.sendJoinGroupRequest()
> @407 - (Re-)joining group hades
> 2017-04-30T17:45:11,961 INFO StreamThread-1
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.onSuccess()
> @375 - Successfully joined group hades with generation 99
> 2017-04-30T17:45:13,126 INFO StreamThread-1
> org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.onJoinComplete()
> @252 - Setting newly assigned partitions [poseidonIncidentFeed-11,
> poseidonIncidentFeed-27, poseidonIncidentFeed-25, poseidonIncidentFeed-29,
> poseidonIncidentFeed-19, poseidonIncidentFeed-18] for group hades
> 2017-04-30T17:46:37,254 INFO kafka-coordinator-heartbeat-thread | hades
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.coordinatorDead()
> @618 - Marking the coordinator 10.210.200.144:9092 (id: 2147483644 rack:
> null) dead for group hades
> 2017-04-30T18:04:25,993 INFO StreamThread-1
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.onSuccess()
> @573 - Discovered coordinator 10.210.200.144:9092 (id: 2147483644 rack: null)
> for group hades.
> 2017-04-30T18:04:29,401 INFO StreamThread-1
> org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.onJoinPrepare()
> @393 - Revoking previously assigned partitions [poseidonIncidentFeed-11,
> poseidonIncidentFeed-27, poseidonIncidentFeed-25, poseidonIncidentFeed-29,
> poseidonIncidentFeed-19, poseidonIncidentFeed-18] for group hades
> 2017-04-30T18:05:10,877 INFO StreamThread-1
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.sendJoinGroupRequest()
> @407 - (Re-)joining group hades
> 2017-05-01T00:01:55,707 INFO StreamThread-1
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.coordinatorDead()
> @618 - Marking the coordinator 10.210.200.144:9092 (id: 2147483644 rack:
> null) dead for group hades
> 2017-05-01T00:01:59,027 INFO StreamThread-1
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.onSuccess()
> @573 - Discovered coordinator 10.210.200.144:9092 (id: 2147483644 rack: null)
> for group hades.
> 2017-05-01T00:01:59,031 ERROR StreamThread-1
> org.apache.kafka.streams.processor.internals.StreamThread.run() @376 -
> stream-thread [StreamThread-1] Streams application error during processing:
> java.lang.NullPointerException
> at
> org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:619)
> ~[kafka-streams-0.10.2.0.jar!/:?]
> at
> org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:368)
> [kafka-streams-0.10.2.0.jar!/:?]
> 2017-05-01T00:02:00,038 INFO StreamThread-1
> org.apache.kafka.clients.producer.KafkaProducer.close() @689 - Closing the
> Kafka producer with timeoutMillis = 9223372036854775807 ms.
> 2017-05-01T00:02:00,949 WARN StreamThread-1
> org.apache.kafka.streams.processor.internals.StreamThread.setState() @160 -
> Unexpected state transition from PARTITIONS_REVOKED to NOT_RUNNING
> 2017-05-01T00:02:00,951 ERROR StreamThread-1
> com.williamhill.trading.platform.hades.kafka.KafkaStreamManager.uncaughtException()
> @104 - UncaughtException in thread StreamThread-1, stopping kafka streams
> java.lang.NullPointerException
> at
> org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:619)
> ~[kafka-streams-0.10.2.0.jar!/:?]
> at
> org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:368)
> ~[kafka-streams-0.10.2.0.jar!/:?]
> 2017-05-01T00:02:01,076 WARN kafka-streams-close-thread
> org.apache.kafka.streams.processor.internals.StreamThread.setState() @160 -
> Unexpected state transition from NOT_RUNNING to PENDING_SHUTDOWN
> {noformat}
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