[KAFKA-5226] NullPointerException (NPE) in SourceNodeRecordDeserializer.deserialize

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.10.2.1
• Fix Version/s: 0.11.0.0
• Component/s: streams
• Environment: 64-bit Amazon Linux, JDK8
• Assignee: Bill Bejeck
• Reporter: Ian Springer
• Created: 12/May/17 16:29
• Updated: 01/Jun/17 02:38
• Resolved: 01/Jun/17 02:36

Description

I saw the following NPE in our Kafka Streams app, which has 3 nodes running on 3 separate machines.. Out of hundreds of messages processed, the NPE only occurred twice. I are not sure of the cause, so I am unable to reproduce it. I'm hoping the Kafka Streams team can guess the cause based on the stack trace. If I can provide any additional details about our app, please let me know.

INFO  2017-05-10 02:58:26,021 org.apache.kafka.common.utils.AppInfoParser  Kafka version : 0.10.2.1
INFO  2017-05-10 02:58:26,021 org.apache.kafka.common.utils.AppInfoParser  Kafka commitId : e89bffd6b2eff799
INFO  2017-05-10 02:58:26,031 o.s.context.support.DefaultLifecycleProcessor  Starting beans in phase 0
INFO  2017-05-10 02:58:26,075 org.apache.kafka.streams.KafkaStreams  stream-client [evergage-app-bd9c9868-4b9b-4d2e-850f-9b5bec1fc0a9] State transition from CREATED to RUNNING.
INFO  2017-05-10 02:58:26,075 org.apache.kafka.streams.KafkaStreams  stream-client [evergage-app-bd9c9868-4b9b-4d2e-850f-9b5bec1fc0a9] Started Kafka Stream process
INFO  2017-05-10 02:58:26,086 o.a.k.c.consumer.internals.AbstractCoordinator  Discovered coordinator p1kaf1.prod.apptegic.com:9092 (id: 2147482646 rack: null) for group evergage-app.
INFO  2017-05-10 02:58:26,126 o.a.k.c.consumer.internals.ConsumerCoordinator  Revoking previously assigned partitions [] for group evergage-app
INFO  2017-05-10 02:58:26,126 org.apache.kafka.streams.KafkaStreams  stream-client [evergage-app-bd9c9868-4b9b-4d2e-850f-9b5bec1fc0a9] State transition from RUNNING to REBALANCING.
INFO  2017-05-10 02:58:26,127 o.a.k.c.consumer.internals.AbstractCoordinator  (Re-)joining group evergage-app
INFO  2017-05-10 02:58:27,712 o.a.k.c.consumer.internals.AbstractCoordinator  Successfully joined group evergage-app with generation 18
INFO  2017-05-10 02:58:27,716 o.a.k.c.consumer.internals.ConsumerCoordinator  Setting newly assigned partitions [us.app.Trigger-0] for group evergage-app
INFO  2017-05-10 02:58:27,716 org.apache.kafka.streams.KafkaStreams  stream-client [evergage-app-bd9c9868-4b9b-4d2e-850f-9b5bec1fc0a9] State transition from REBALANCING to REBALANCING.
INFO  2017-05-10 02:58:27,729 o.a.kafka.streams.processor.internals.StreamTask  task [0_0] Initializing state stores
INFO  2017-05-10 02:58:27,731 o.a.kafka.streams.processor.internals.StreamTask  task [0_0] Initializing processor nodes of the topology
INFO  2017-05-10 02:58:27,742 org.apache.kafka.streams.KafkaStreams  stream-client [evergage-app-bd9c9868-4b9b-4d2e-850f-9b5bec1fc0a9] State transition from REBALANCING to RUNNING.

[14 hours pass...]

INFO  2017-05-10 16:21:27,476 o.a.k.c.consumer.internals.ConsumerCoordinator  Revoking previously assigned partitions [us.app.Trigger-0] for group evergage-app
INFO  2017-05-10 16:21:27,477 org.apache.kafka.streams.KafkaStreams  stream-client [evergage-app-bd9c9868-4b9b-4d2e-850f-9b5bec1fc0a9] State transition from RUNNING to REBALANCING.
INFO  2017-05-10 16:21:27,482 o.a.k.c.consumer.internals.AbstractCoordinator  (Re-)joining group evergage-app
INFO  2017-05-10 16:21:27,489 o.a.k.c.consumer.internals.AbstractCoordinator  Successfully joined group evergage-app with generation 19
INFO  2017-05-10 16:21:27,489 o.a.k.c.consumer.internals.ConsumerCoordinator  Setting newly assigned partitions [us.app.Trigger-0] for group evergage-app
INFO  2017-05-10 16:21:27,489 org.apache.kafka.streams.KafkaStreams  stream-client [evergage-app-bd9c9868-4b9b-4d2e-850f-9b5bec1fc0a9] State transition from REBALANCING to REBALANCING.
INFO  2017-05-10 16:21:27,489 o.a.kafka.streams.processor.internals.StreamTask  task [0_0] Initializing processor nodes of the topology
INFO  2017-05-10 16:21:27,493 org.apache.kafka.streams.KafkaStreams  stream-client [evergage-app-bd9c9868-4b9b-4d2e-850f-9b5bec1fc0a9] State transition from REBALANCING to RUNNING.
INFO  2017-05-10 16:21:30,584 o.a.k.c.consumer.internals.ConsumerCoordinator  Revoking previously assigned partitions [us.app.Trigger-0] for group evergage-app
INFO  2017-05-10 16:21:30,584 org.apache.kafka.streams.KafkaStreams  stream-client [evergage-app-bd9c9868-4b9b-4d2e-850f-9b5bec1fc0a9] State transition from RUNNING to REBALANCING.
INFO  2017-05-10 16:21:30,588 o.a.k.c.consumer.internals.AbstractCoordinator  (Re-)joining group evergage-app
INFO  2017-05-10 16:21:30,593 o.a.k.c.consumer.internals.AbstractCoordinator  Successfully joined group evergage-app with generation 20
INFO  2017-05-10 16:21:30,594 o.a.k.c.consumer.internals.ConsumerCoordinator  Setting newly assigned partitions [demo.retail.Trigger-0, us.app.Trigger-0] for group evergage-app
INFO  2017-05-10 16:21:30,594 org.apache.kafka.streams.KafkaStreams  stream-client [evergage-app-bd9c9868-4b9b-4d2e-850f-9b5bec1fc0a9] State transition from REBALANCING to REBALANCING.
INFO  2017-05-10 16:21:30,595 o.a.kafka.streams.processor.internals.StreamTask  task [0_0] Initializing state stores
INFO  2017-05-10 16:21:30,596 o.a.kafka.streams.processor.internals.StreamTask  task [0_0] Initializing processor nodes of the topology
INFO  2017-05-10 16:21:30,602 org.apache.kafka.streams.KafkaStreams  stream-client [evergage-app-bd9c9868-4b9b-4d2e-850f-9b5bec1fc0a9] State transition from REBALANCING to RUNNING.
INFO  2017-05-10 16:21:30,698 org.apache.kafka.clients.producer.KafkaProducer  Closing the Kafka producer with timeoutMillis = 9223372036854775807 ms.
WARN  2017-05-10 16:21:30,703 o.a.kafka.streams.processor.internals.StreamThread  stream-thread [StreamThread-1] Unexpected state transition from RUNNING to NOT_RUNNING.
ERROR 2017-05-10 16:21:30,704 c.a.a.web.server.UncaughtExceptionLoggingListener  Uncaught exception in thread [StreamThread-1]
org.apache.kafka.streams.errors.StreamsException: Failed to deserialize key for record. topic=demo.retail.Trigger, partition=0, offset=0
	at org.apache.kafka.streams.processor.internals.SourceNodeRecordDeserializer.deserialize(SourceNodeRecordDeserializer.java:38)
	at org.apache.kafka.streams.processor.internals.RecordQueue.addRawRecords(RecordQueue.java:85)
	at org.apache.kafka.streams.processor.internals.PartitionGroup.addRawRecords(PartitionGroup.java:117)
	at org.apache.kafka.streams.processor.internals.StreamTask.addRecords(StreamTask.java:158)
	at org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:605)
	at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:361)
Caused by: java.lang.NullPointerException: null
	at org.apache.kafka.streams.processor.internals.SourceNodeRecordDeserializer.deserialize(SourceNodeRecordDeserializer.java:36)
	... 5 common frames omitted

Issue Links

• links to: GitHub Pull Request #3157