Getting Started with Your First Topology - Real-time Analytics with Storm and Cassandra - page 32

will be spawned at the time of submitting the topology. In our example, we will
have five instances of the spout.
• setBolt : We use this method to add two bolts to the topology: SplitSen-
tenceBolt , which splits the sentence into words, and WordCountBolt ,
which counts the words.
• Other noteworthy items in the preceding code snippet are suffleGrouping
and fieldsGrouping ; we shall discuss these in detail in the next chapter; for
now, understand that these are the components that control routing of tuples to
various bolts in the topology.