[jira] [Created] (KAFKA-3728) inconsistent behavior of Consumer.poll() when assigned vs subscribed

["Edoardo Comar (JIRA)" <ji...@apache.org>]

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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