Stig Rohde Døssing created KAFKA-7616:
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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.
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