Hi, All I like to develop a bitmap to count uniques in bolt, the process is like this, spout take the stream from kafka, emit to bolt, bolt will output an online user bitmap with predefined time window. My plan is to use bitmap structure in redis, say set bit(key, offset, value), where key is user action and time window, offset is useriD, value is 1. I know there is a storm-redis-pubsub checkin in storm-contrib, but never use it, i wonder if anyone ever done or thinking to make bitmap in storm.
thanks Alec.
