[NIFI-4262] MergeContent - option to add merged uuid in original flow files

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.7.0
• Component/s: Extensions
• Assignee: Pierre Villard
• Reporter: Pierre Villard
• Created: 03/Aug/17 21:33
• Updated: 11/Jun/18 12:11
• Resolved: 08/Jun/18 15:35

Description

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.

Issue Links

• relates to: NIFI-5293 Add merge.uuid to MergeRecord processor
• links to: GitHub Pull Request #2056