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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4391) Provide support for asynchronous operations over streams
Date Mon, 07 Nov 2016 02:47:59 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15642901#comment-15642901
] 

ASF GitHub Bot commented on FLINK-4391:
---------------------------------------

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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