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https://issues.apache.org/jira/browse/FLINK-36942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17907333#comment-17907333
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Zakelly Lan commented on FLINK-36942:
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[~au_miner] Thanks for your contribution! The root cause is the test harness
`OneInputStreamOperatorTestHarness` is not well implemented with async state.
Please use `AsyncKeyedOneInputStreamOperatorTestHarness` instead, when you are
testing the async state.
And the PR you mentioned perform a important
[fix](https://github.com/apache/flink/pull/25815/files#diff-885dd1cb87987c93b79ac6da39deeb53d5a09dc434196031d4c53e60b18e88e3L57-R66)
on `TwoInputStreamOperatorTestHarness`. That's why it runs well.
Please try `AsyncKeyedOneInputStreamOperatorTestHarness`, we will use that
harness for all async state operators in future.
> Unable to trigger onEventTime() when using the async state API in
> RowTimestamportOperator
> -----------------------------------------------------------------------------------------
>
> Key: FLINK-36942
> URL: https://issues.apache.org/jira/browse/FLINK-36942
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Runtime
> Affects Versions: 2.0.0
> Reporter: Wang Qilong
> Priority: Major
>
> When I use the async state API in RowTimeSortOperator and inherit it from
> AbstractAsyncStateStreamOperator, I cannot trigger onEventTime() when the
> timer expires.
> Regarding how to reproduce:
> In
> [AsyncStateRowTimeSortOperator|https://github.com/Au-Miner/flink/tree/RowTimeSortOperator]
> and execute the tests in RowTimestamportOperatorTest.
> I think this is a very strange bug because it can be triggered smoothly in
> [AsyncStateWindowJoinOperator|https://github.com/apache/flink/pull/25815],
> but cannot be implemented in RowTimestamportOperator.
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