Oleg Zhurakousky commented on NIFI-2794:

Had an off-line discussion with Pierre but to stay true to ASF world below is 
the summary of it
Based on our discussion we both realized that the use case Pierre was trying to 
address falls into the category of basic aggregation and as Pierre already 
pointed out it is tracked by several issues already NIFI-2590, NIFI-1926, 
So I think it is fair to close this issue as won't fix after linking it to any 
of the once mentioned above especially NIFI-1926 since it already attempts to 
collect variety of use cases.
Also, linking [~mattyb149] since he is involved in the overall effort as well.

> Expose a getOneFromEachConnection method in ProcessSession
> ----------------------------------------------------------
>                 Key: NIFI-2794
>                 URL: https://issues.apache.org/jira/browse/NIFI-2794
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Core Framework
>    Affects Versions: 1.0.0
>            Reporter: Pierre Villard
>            Assignee: Pierre Villard
>            Priority: Minor
>         Attachments: image.png
> In case a processor has multiple incoming connections, it could be 
> interesting to expose a method allowing users to get exactly one flow file 
> per incoming connection in a row.
> That could unlock opportunities such as performing join operations on 
> datasets.

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