[jira] [Resolved] (KAFKA-7616) MockConsumer can return ConsumerRecords objects with a non-empty map but no records

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

     [ https://issues.apache.org/jira/browse/KAFKA-7616?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Manikumar resolved KAFKA-7616.
------------------------------
       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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