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https://issues.apache.org/jira/browse/KAFKA-7616?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Manikumar resolved KAFKA-7616.
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Resolution: Fixed
Fix Version/s: 2.2.0
Issue resolved by pull request 5901
[https://github.com/apache/kafka/pull/5901]
> 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
> Priority: Trivial
> Fix For: 2.2.0
>
>
> 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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