The following sections explain all the components of a Storm topology:
- Topology: A topology is a DAG (directed acyclic graph) of spouts and bolts that are connected with stream groupings. A topology runs continuously untill it is killed.
- Stream: A stream is an unbounded sequence of tuples. A tuple can be of any data type. It supports all the Java data types.
- Stream groupings: Stream grouping decides which bolt receives a tuple from a spout. Basically, these are the strategies about how the stream will flow among different bolts. The following are the built-in stream groupings in Storm.
- Shuffle grouping: It is a default grouping strategy. Tuples are randomly distributed and each bolt gets an equal number of streams ...
