Introduction to Storm scheduler

As mentioned in the first two chapters, the Nimbus is responsible for deploying the topology and the supervisor is responsible for performing the computation tasks as defined in a Storm topology's spouts and bolts components. As we have shown, we can configure the number of worker slots for each supervisor node that are assigned to a topology as per the scheduler policy, as well as the number of workers allocated to a topology. In short, Storm schedulers help the Nimbus to decide the worker distribution of any given topology.