[jira] [Resolved] (KAFKA-17209) Revisit testCurrentLag for AsyncKafkaConsumer

["TaiJuWu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-17209?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

TaiJuWu resolved KAFKA-17209.
-----------------------------
    Resolution: Duplicate

> Revisit testCurrentLag for AsyncKafkaConsumer
> ---------------------------------------------
>
>                 Key: KAFKA-17209
>                 URL: https://issues.apache.org/jira/browse/KAFKA-17209
>             Project: Kafka
>          Issue Type: Test
>          Components: clients, unit tests
>            Reporter: TaiJuWu
>            Assignee: TaiJuWu
>            Priority: Major
>              Labels: kip-848-client-support
>
> 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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