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https://issues.apache.org/jira/browse/KAFKA-17209?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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TaiJuWu updated KAFKA-17209:
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External issue URL: https://github.com/apache/kafka/pull/16703
> Revisit testCurrentLag for AsyncKafkaConsumer
> ---------------------------------------------
>
> Key: KAFKA-17209
> URL: https://issues.apache.org/jira/browse/KAFKA-17209
> Project: Kafka
> Issue Type: Test
> Reporter: TaiJuWu
> Assignee: TaiJuWu
> Priority: Major
>
> The difference between {{ClassicConsumer}} and {{AsyncConsumer}} is
> ClassicConsumer is single thread and AsyncConsumer is two thread, one is app
> thread, the other is background thread.
> {{Fetch}} Request is generated by background thread and {{ListOffset}}
> Request is generated by application thread.
> This will make {{testCurrentLag}} fail if AsyncConsumer generated {{Fetch
> Request}} first.
> So we support out of order feature for {{MockClient}} to resolve issue.
> Another difference between asyncConsumer and ClassicConsumer is front do
> generate additional {{FetchOffset}} Request from CommitRequestManager but
> ClassicConsumer does not have the request.
> The reason is coordinator is not ready during test for {{ClassicConsumer}} so
> we can ignore this request for {{AsyncConsumer.}}
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