[jira] [Commented] (FLINK-4391) Provide support for asynchronous operations over streams

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-4391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15721714#comment-15721714 ] 

ASF GitHub Bot commented on FLINK-4391:
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Github user tillrohrmann commented on the issue:

    https://github.com/apache/flink/pull/2629
  
    Hi @bjlovegithub, just wanted check whether I can help you with anything to complete this PR and get it merged. If that's the case, then let me know.


> 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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