10 Stateful computation
In this chapter
- an introduction to stateful and stateless components
- how stateful components work
- related techniques
“Have you tried turning it off and on again?”
—The IT Crowd
We talked about state in chapter 5. In most computer programs, it is an important concept. For example, the progress in a game, the current content in a text editor, the rows in a spreadsheet, and the opened pages in a web browser are all states of the programs. When a program is closed and opened again, we would like to recover to the desired state. In streaming systems, handling states correctly is very important. In this chapter, we are going to discuss in more detail how states are used and managed in streaming systems.
The migration of the ...
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