[GitHub] [nifi] ekovacs commented on issue #3351: NIFI-2933 Remote input/output ports at any PG

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ekovacs commented on issue #3351: NIFI-2933 Remote input/output ports at any PG
URL: https://github.com/apache/nifi/pull/3351#issuecomment-477558039
 
 
   Hi @ijokarumawak 
   
   i checked out the PR and played around with it. There are a few remarks / questions i have:
   
   
   1. any port dragged onto the root canvas is public by default. I only have the ability to select the type of the port if i am already in a PG.
   
   2. if i create a simple, 2 part flow like this:
   	a.) "generate flowfile" => "Remote Process Group"  and
   	b.) "input port" => "logAttribute"
   
   and then i want to group 'b.)' part of the flow into a PG, i'll get a:
   	"Cannot move Ports from the Root Group to a Non-Root Group". 
   i see that this limitation is not brought in by this PR, but existed previously in the master, along with some other checks:
   https://github.com/apache/nifi/blob/d3d43262db7fc5558a3a8a9c70926501ddb93e53/nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-framework-core/src/main/java/org/apache/nifi/groups/StandardProcessGroup.java#L2770
   do we want to keep these limitations?
   
   3. I create a PG, and in that PG i created a public port. Modified a.) part of the flow.: Disabled transmission. Deleted Connection. Created a new connection: "to input", selected the: "public port in child". Enabled transmission. FLowfiles started to flow to the PG's public port, this is good. 
   While transitting, i created another connection: "to input" selected: "port-on-root-canvas". Flow files are being queued up for this connection. unless i stop transmission and start transmission for the Remote Process Group. see attached picture.
   ![Screen Shot 2019-03-28 at 12 20 40](https://user-images.githubusercontent.com/1477846/55154512-4b5d8180-5155-11e9-85dd-8967a1dece3f.png)
   
   
   4. After 3., i deleted the connection with the queued flowfiles. RPG still shows "XYZ -> 2". yet it transmits only to one public port (one that is in the child PG) 
   ![Screen Shot 2019-03-28 at 12 27 48](https://user-images.githubusercontent.com/1477846/55154653-a55e4700-5155-11e9-8455-dce5982bff91.png)
   
   

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