[jira] [Commented] (NIFI-4262) MergeContent - option to add merged uuid in original flow files

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

    [ https://issues.apache.org/jira/browse/NIFI-4262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16464219#comment-16464219 ] 

ASF GitHub Bot commented on NIFI-4262:
--------------------------------------

Github user pvillard31 commented on the issue:

    https://github.com/apache/nifi/pull/2056
  
    Rebased against master


> 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
>            Priority: Major
>
> 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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