Remote Process Group Transmission
Remote Process Groups provide a mechanism for sending data to or retrieving data from a remote instance of NiFi. When a Remote Process Group (RPG) is added to the canvas, it is added with the Transmission Disabled, as indicated by the icon ( ) in the top-left corner. When Transmission is Disabled, it can be enabled by right-clicking on the RPG and clicking the "Enable transmission" menu item. This will cause all ports for which there is a Connection to begin transmitting data. This will cause the status indicator to then change to the Transmission Enabled icon ( ).
If there are problems communicating with the Remote Process Group, a Warning indicator ( ) may instead be present in the top-left corner. Hovering over this Warning indicator with the mouse will provide more information about the problem.