Edoardo Comar created KAFKA-3728:
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Summary: inconsistent behavior of Consumer.poll() when assigned vs
subscribed
Key: KAFKA-3728
URL: https://issues.apache.org/jira/browse/KAFKA-3728
Project: Kafka
Issue Type: Bug
Reporter: Edoardo Comar
A consumer that is manually assigned a topic-partition is able to consume
messages that a consumer that subscribes to the topic can not.
To reproduce : take the test
EndToEndAuthorizationTest.testProduceConsume
(eg the SaslSslEndToEndAuthorizationTest implementation)
it passes ( = messages are consumed)
if the consumer is assigned the single topic-partition
consumers.head.assign(List(tp).asJava)
but fails
if the consumer subscribes to the topic - changing the line to :
consumers.head.subscribe(List(topic).asJava)
The failure when subscribed shows this error about synchronization:
org.apache.kafka.common.KafkaException: Unexpected error from SyncGroup:
Messages are rejected since there are fewer in-sync replicas than required.
at
org.apache.kafka.clients.consumer.internals.AbstractCoordinator$SyncGroupResponseHandler.handle(AbstractCoordinator.java:455)
The test passes in both cases (subscribe and assign) with the setting
this.serverConfig.setProperty(KafkaConfig.MinInSyncReplicasProp, "1")
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