Hi @Alvin Jin Happy that this information was helpful. Yes, you need to add your input port at the root canvas. If you need to work with process group, you still need to have an input port at root, then add an input port in your process group, then connect your root input port with process group: If you have recursive process groups you should do the same thing to connect your external input port until your internal process group. Regarding data distribution, you should know that S2S do batching of data to have better performance. So it tries to send maximum data to one node before moving to the next one. This is very efficient. But if you have few flows (when testing for example) all flow files will go to a single node. Mainly S2S open a connection to a node and try to send data for x miliseconds. If this time is not enough it moves to the next node. Other parameters are flow file count and size. These parameters can be defined globally. In the last versions of NiFi you can define these parameters at each input port level which is very convenient. I show you how to configure this below (red instructions) You can small values to test load balancing. Please close the thread if it answers your question. If you have further questions on load balancing ask new question. This will be helpful for other users. Thanks
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