If this is set to true, this means that a bolt will ack a tuple as soon as it is received and processing begins; otherwise, the tuple will be acked when the bolt completes.
If true, the topology will anchor tuples in all flatMap bolts and ack in the final sink bolt.
When a bolt is prepared, these metrics will be use by being called with the TopologyContext for the storm bolt.
Maximum number of elements to execute in a given second per task
This signals that the storm bolts should use localOrShuffleGrouping, which means that if the downstream bolt has a task on the same local worker, the output will only go to those tasks.