The design patterns are the solution templates for solving specific problems. Developers can reuse templates for similar problems across domains so that they save time in solving problems. If you are a programmer, you would have used the abstract factory pattern, builder pattern, observer pattern, and so on before. These patterns are discovered by people who have been solving similar problems for many years. The MapReduce framework has existed for almost a decade now. Let's look into a few of the commonly used MapReduce design patterns across industries.
Summarization problems use the pattern widely across domains. It's all about grouping similar data together and then performing an operation such as calculating a minimum, maximum, count, average, median-standard deviation, building an index, or just simply counting based on key. For example, we might want to calculate the total amount of money our website has made by country. As another example...
