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courses:mapreduce-tutorial:step-24 [2012/01/27 21:28] straka |
courses:mapreduce-tutorial:step-24 [2012/01/27 21:41] straka |
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====== MapReduce Tutorial : Mappers, running Java Hadoop jobs ====== | ====== MapReduce Tutorial : Mappers, running Java Hadoop jobs ====== | ||
- | We start by exploring | + | We start by going through |
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+ | A mapper which processes (key, value) pairs of types (Kin, Vin) and produces (key, value) pairs of types (Kout, Vout) must be a subclass of [[http:// | ||
+ | |||
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+ | http:// | ||
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+ | The Mapper outputs only keys starting with '' | ||
<file java MapperOnlyHadoopJob.java> | <file java MapperOnlyHadoopJob.java> | ||
import java.io.IOException; | import java.io.IOException; |