Reactive Programming with RxJava-Chapter(9):Future Directions

Why a version2?

1. To natively support the Reactive Streams API
2. To split the Observable type into two types:Observable and Flowable
   
   1. Observable:pure push without request(n)
   2. Flowable:”Observable with backpressure”
3. Improve overall performance (reduce overhead)
   
   1. To Reducing the allocation amount when building up chains of operators,subscribing to,and running them.
   2. Operator-fusion