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https://issues.apache.org/jira/browse/KAFKA-5226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16009418#comment-16009418
]
Ian Springer commented on KAFKA-5226:
-------------------------------------
The key serde is not a custom serde. It's
org.apache.kafka.common.serialization.Serdes.StringSerde, which wraps
org.apache.kafka.common.serialization.StringDeserializer. And
org.apache.kafka.common.serialization.StringDeserializer#deserialize does check
for a null data param.
I can add an e.printStackTrace, but I suspect we are already seeing the full
stack trace, aside from the "5 common frames omitted". With the 5 omitted
frames included, it would just look like this:
{code}
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)
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)
{code}
We're not sending any records with null keys. Here's the code we use to send
records:
{code}
String recordKey = UUID.randomUUID().toString();
ProducerRecord<String, MyPojo> record = new ProducerRecord<>(topic, recordKey,
myPojo);
producer.send(record, this::processSendResult));
{code}
> NullPointerException (NPE) in SourceNodeRecordDeserializer.deserialize
> ----------------------------------------------------------------------
>
> Key: KAFKA-5226
> URL: https://issues.apache.org/jira/browse/KAFKA-5226
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.2.1
> Environment: 64-bit Amazon Linux, JDK8
> Reporter: Ian Springer
>
> 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.
>
> {code}
> 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
> {code}
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