Oleg Zhurakousky commented on NIFI-2794:

[~pvillard] I've read the description, yet I am still not getting as to what is 
the value for this. I am definitely missing something, but may be you can 
clarify a bit more. . . may be a more concrete use case that it would address? 
I know you mentioned join, but there is no guarantee that "all required" will 
arrive at the pre-defined time, right? Anyway, help me out here ;)

> 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
> 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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