ASF GitHub Bot commented on NIFI-4262:

Github user pvillard31 commented on the issue:

    Done, thanks @mattyb149 !

> MergeContent - option to add merged uuid in original flow files
> ---------------------------------------------------------------
>                 Key: NIFI-4262
>                 URL: https://issues.apache.org/jira/browse/NIFI-4262
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Extensions
>            Reporter: Pierre Villard
>            Assignee: Pierre Villard
> With the apparition of Wait/Notify processors it is now possible tackle new 
> challenges when it comes to synchronize the execution of different parts of 
> the workflow.
> The objective here is the following:
> Flow files are sent to a MergeContent processor. Merged flow files are then 
> sent to a processor A while original flow files are sent to a processor B. I 
> want to trigger processor B when and only when processor A has completed.
> To use the Wait/Notify approach, a common attribute must be available to be 
> used as a signal in the distributed cache. This JIRA is about adding a 
> processor property allowing a user to add the UUID of the merged flow file as 
> a new attribute of all the original flow files that are constituting the 
> merged flow file.
> The template attached to NIFI-4028 can be used for this use case. Note that 
> the fix for NIFI-4028 is needed to solve the use case described in this JIRA.

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