1. A method for managing a stream application, the stream application composed from a plurality of processing elements executing on one or more compute nodes, the method comprising: generating a graphical user interface display presenting at least a portion of an operator graph, wherein the operator graph represents the plurality of processing elements, and links between processing elements, corresponding to a flow of data tuples through the stream application; monitoring user interactions with the presentation of the portion of the operator graph on the graphical user interface display; and identifying at least a first modification to the stream application based on a processing state of the stream application and the monitored user interactions.