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https://issues.apache.org/jira/browse/FLINK-4391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15642901#comment-15642901
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ASF GitHub Bot commented on FLINK-4391:
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Github user bjlovegithub commented on the issue:
https://github.com/apache/flink/pull/2629
Good point ;D
Emm, I think we have to override the
`StreamOpeartor.notifyCheckpointComplete()` for `AsyncWaitOpeartor` so that
once the `TaskManager` notifies the `Task` that checkpoint has completed, the
`EmitterThread` can start working as soon as possible.
> Provide support for asynchronous operations over streams
> --------------------------------------------------------
>
> Key: FLINK-4391
> URL: https://issues.apache.org/jira/browse/FLINK-4391
> Project: Flink
> Issue Type: New Feature
> Components: DataStream API
> Reporter: Jamie Grier
> Assignee: david.wang
>
> Many Flink users need to do asynchronous processing driven by data from a
> DataStream. The classic example would be joining against an external
> database in order to enrich a stream with extra information.
> It would be nice to add general support for this type of operation in the
> Flink API. Ideally this could simply take the form of a new operator that
> manages async operations, keeps so many of them in flight, and then emits
> results to downstream operators as the async operations complete.
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