Damian Guy created KAFKA-4539:
---------------------------------
Summary: NPE in StreamThread when creating StandbyTasks
Key: KAFKA-4539
URL: https://issues.apache.org/jira/browse/KAFKA-4539
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 0.10.2.0
Reporter: Damian Guy
Assignee: Damian Guy
Fix For: 0.10.2.0
Fails because {{createStandbyTask(..)}} can return null fi the topology for the
{{TaskId}} doesn't have any state stores.
{code}
[2016-12-14 12:20:29,758] ERROR [StreamThread-1] User provided listener
org.apache.kafka.streams.processor.internals.StreamThread$1 for group
kafka-music-charts failed on partition assignment
(org.apache.kafka.clients.consumer.internals.ConsumerCoordinator)
java.lang.NullPointerException
at
org.apache.kafka.streams.processor.internals.StreamThread$StandbyTaskCreator.createTask(StreamThread.java:1241)
at
org.apache.kafka.streams.processor.internals.StreamThread$AbstractTaskCreator.retryWithBackoff(StreamThread.java:1188)
at
org.apache.kafka.streams.processor.internals.StreamThread.addStandbyTasks(StreamThread.java:915)
at
org.apache.kafka.streams.processor.internals.StreamThread.access$400(StreamThread.java:72)
at
org.apache.kafka.streams.processor.internals.StreamThread$1.onPartitionsAssigned(StreamThread.java:239)
at
org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.onJoinComplete(ConsumerCoordinator.java:230)
at
org.apache.kafka.clients.consumer.internals.AbstractCoordinator.joinGroupIfNeeded(AbstractCoordinator.java:314)
at
org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureActiveGroup(AbstractCoordinator.java:278)
at
org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.poll(ConsumerCoordinator.java:261)
at
org.apache.kafka.clients.consumer.KafkaConsumer.pollOnce(KafkaConsumer.java:1022)
at
org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:987)
at
org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:568)
at
org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:357)
{code}
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