Stig Rohde Døssing created KAFKA-7616: -----------------------------------------
Summary: MockConsumer can return ConsumerRecords objects with a non-empty map but no records Key: KAFKA-7616 URL: https://issues.apache.org/jira/browse/KAFKA-7616 Project: Kafka Issue Type: Bug Components: clients Affects Versions: 2.0.1 Reporter: Stig Rohde Døssing Assignee: Stig Rohde Døssing The ConsumerRecords returned from MockConsumer.poll can return false for isEmpty while not containing any records. This behavior is because MockConsumer.poll eagerly adds entries to the returned Map<TopicPartition, List<ConsumerRecord>>, based on which partitions have been added. If no records are returned for a partition, e.g. because the position was too far ahead, the entry for that partition will still be there. The MockConsumer should lazily add entries to the map as they are needed, since it is more in line with how the real consumer behaves. -- This message was sent by Atlassian JIRA (v7.6.3#76005)