Murilo Tavares created KAFKA-9518:
-------------------------------------
Summary: NullPointerException on out-of-order topologies
Key: KAFKA-9518
URL: https://issues.apache.org/jira/browse/KAFKA-9518
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 2.3.1, 2.4.0
Reporter: Murilo Tavares
Attachments: kafka-streams-testing.zip
I have a KafkaStreams that dinamically builds a topology based on a Map of
input-to-output topics. Since the map was not sorted, iteration was
unpredictable, and different instances could have different orders. When this
happen, KafkaStreams throws an exception during REBALANCE.
I was able to reproduce this using the attached java project. The project is a
pretty simple Maven project with one class. It starts 2 instances in parallel,
with the same input-to-output topics, but one instance takes the topics in a
reversed order.
The exception is this:
{noformat}
*no* further _formatting_ is done here{noformat}
Exception in thread
"MY-APP-81e9dc0b-1459-4499-93d6-b5c03da60e18-StreamThread-1"
org.apache.kafka.streams.errors.StreamsException: stream-thread
[MY-APP-81e9dc0b-1459-4499-93d6-b5c03da60e18-StreamThread-1] Failed to
rebalance. at
org.apache.kafka.streams.processor.internals.StreamThread.pollRequests(StreamThread.java:852)
at
org.apache.kafka.streams.processor.internals.StreamThread.runOnce(StreamThread.java:743)
at
org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:698)
at
org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:671)
Caused by: java.lang.NullPointerException at
org.apache.kafka.streams.processor.internals.StreamTask.<init>(StreamTask.java:234)
at
org.apache.kafka.streams.processor.internals.StreamTask.<init>(StreamTask.java:176)
at
org.apache.kafka.streams.processor.internals.StreamThread$TaskCreator.createTask(StreamThread.java:355)
at
org.apache.kafka.streams.processor.internals.StreamThread$TaskCreator.createTask(StreamThread.java:313)
at
org.apache.kafka.streams.processor.internals.StreamThread$AbstractTaskCreator.createTasks(StreamThread.java:298)
at
org.apache.kafka.streams.processor.internals.TaskManager.addNewActiveTasks(TaskManager.java:160)
at
org.apache.kafka.streams.processor.internals.TaskManager.createTasks(TaskManager.java:120)
at
org.apache.kafka.streams.processor.internals.StreamsRebalanceListener.onPartitionsAssigned(StreamsRebalanceListener.java:77)
at
org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.invokePartitionsAssigned(ConsumerCoordinator.java:272)
at
org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.onJoinComplete(ConsumerCoordinator.java:400)
at
org.apache.kafka.clients.consumer.internals.AbstractCoordinator.joinGroupIfNeeded(AbstractCoordinator.java:421)
at
org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureActiveGroup(AbstractCoordinator.java:340)
at
org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.poll(ConsumerCoordinator.java:471)
at
org.apache.kafka.clients.consumer.KafkaConsumer.updateAssignmentMetadataIfNeeded(KafkaConsumer.java:1267)
at
org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1231)
at
org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1211)
at
org.apache.kafka.streams.processor.internals.StreamThread.pollRequests(StreamThread.java:843)
... 3 more
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