Shulou(Shulou.com)06/03 Report--

This article mainly introduces the example analysis of the key stage of sort in shuffle, which has a certain reference value, and interested friends can refer to it. I hope you will gain a lot after reading this article.

There is a piece of code in the source code

1. Comparator obtained by sorting on the Map side

Public RawComparator getOutputKeyComparator () {/ / gets mapreduce.job.output.key.comparator.class. It must be of type RawComparator. If not set, it must be null Class.

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