Hi, I need to output some data streaming from multiple devices directly into a map (mapboxjs).
Basically, every 1 second, I want to only write the last data point for each device to a json file. My problem resides in "how to pick the latest data point by device" My incoming flow file has three attributes: device_id, lat, lon. at some point they may queue up like this: 1, (-37,20) 1, (-37.1,20.1) 2, (-40,30) 2, (-40.1, 29.9) At the end, I wish to only have the latest point for each device ID 1, (-37.1,20.1) 2, (-40.1, 29.9) How can I design a processor for this? Thanks! Stephane
