Hadoop Tutorial - YDN

Introduction In Module 4 you learned the basics of programming with Hadoop MapReduce. That module explains how data moves through a general MapReduce architecture, and what particular methods and classes facilitate the use of the Hadoop for processing. In this module we will look more closely at how to override Hadoop's functionality in various ways. These techniques allow you to customize Hadoop

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If you have multi-line records each separated by a $ character, you could write your own InputFormat that parses files into records split on this character instead.

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Writable, InputFormat, RecordReaderまわり