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Both sides previous revision Previous revision 2012/01/31 11:48 straka 2012/01/31 11:47 straka 2012/01/31 11:43 straka 2012/01/31 11:42 straka 2012/01/31 11:39 straka 2012/01/31 11:29 straka 2012/01/31 11:28 straka 2012/01/31 11:27 straka 2012/01/31 09:52 straka Change Java commandline syntax.2012/01/30 15:38 majlis 2012/01/30 15:04 majlis 2012/01/28 17:55 straka 2012/01/27 23:57 straka 2012/01/27 23:48 straka 2012/01/27 23:47 straka 2012/01/27 23:46 straka 2012/01/27 22:20 straka 2012/01/27 22:17 straka 2012/01/27 22:17 straka 2012/01/27 22:16 straka 2012/01/27 22:16 straka 2012/01/27 22:08 straka 2012/01/27 22:08 straka 2012/01/27 22:01 straka 2012/01/27 21:56 straka 2012/01/27 21:52 straka 2012/01/27 21:47 straka 2012/01/27 21:41 straka 2012/01/27 21:32 straka 2012/01/27 21:28 straka 2012/01/27 21:28 straka 2012/01/27 21:27 straka 2012/01/27 21:27 straka 2012/01/27 21:02 straka 2012/01/27 21:01 straka 2012/01/27 20:56 straka 2012/01/27 20:40 straka 2012/01/27 20:11 straka vytvořeno Go		2012/01/31 11:48 straka 2012/01/31 11:47 straka 2012/01/31 11:43 straka 2012/01/31 11:42 straka 2012/01/31 11:39 straka 2012/01/31 11:29 straka 2012/01/31 11:28 straka 2012/01/31 11:27 straka 2012/01/31 09:52 straka Change Java commandline syntax.2012/01/30 15:38 majlis 2012/01/30 15:04 majlis 2012/01/28 17:55 straka 2012/01/27 23:57 straka 2012/01/27 23:48 straka 2012/01/27 23:47 straka 2012/01/27 23:46 straka 2012/01/27 22:20 straka 2012/01/27 22:17 straka 2012/01/27 22:17 straka 2012/01/27 22:16 straka 2012/01/27 22:16 straka 2012/01/27 22:08 straka 2012/01/27 22:08 straka 2012/01/27 22:01 straka 2012/01/27 21:56 straka 2012/01/27 21:52 straka 2012/01/27 21:47 straka 2012/01/27 21:41 straka 2012/01/27 21:32 straka 2012/01/27 21:28 straka 2012/01/27 21:28 straka 2012/01/27 21:27 straka 2012/01/27 21:27 straka 2012/01/27 21:02 straka 2012/01/27 21:01 straka 2012/01/27 20:56 straka 2012/01/27 20:40 straka 2012/01/27 20:11 straka vytvořeno Go Next revision Both sides next revision
courses:mapreduce-tutorial:step-24 [2012/01/27 21:47] straka		courses:mapreduce-tutorial:step-24 [2012/01/27 21:52] straka
Line 16:		Line 16:
	</code>		</code>
-	Outputting (key, value) pairs is performed using the [[http://hadoop.apache.org/common/docs/r1.0.0/api/org/apache/hadoop/mapreduce/MapContext.html|MapContext<Kin, Vin, Kout, Vout>]] (the ''Context'' is an abbreviation for this type).	+	Outputting (key, value) pairs is performed using the [[http://hadoop.apache.org/common/docs/r1.0.0/api/org/apache/hadoop/mapreduce/MapContext.html|MapContext<Kin, Vin, Kout, Vout>]] object (the ''Context'' is an abbreviation for this type), with the method ''context.write(Kout key, Vout value)''.
		+
		+	Here is the source of the whole Hadoop job:
	<file java MapperOnlyHadoopJob.java>		<file java MapperOnlyHadoopJob.java>
Line 52:		Line 54:
	}		}
-	Job job = new Job(getConf(), this.getClass().getName());	+	Job job = new Job(getConf(), this.getClass().getName());    // Create class representing Hadoop job.
-	job.setJarByClass(this.getClass());	+	job.setJarByClass(this.getClass());                         // Use jar containing current class.
-	job.setMapperClass(TheMapper.class);	+	job.setMapperClass(TheMapper.class);                        // The mapper of the job.
-	job.setOutputKeyClass(Text.class);	+	job.setOutputKeyClass(Text.class);                          // Type of the output keys.
-	job.setOutputValueClass(Text.class);	+	job.setOutputValueClass(Text.class);                        // Type of the output values.
-	job.setInputFormatClass(KeyValueTextInputFormat.class);	+	job.setInputFormatClass(KeyValueTextInputFormat.class);     // Input format.
		+	// Output format is the default -- TextOutputFormat
-	FileInputFormat.addInputPath(job, new Path(args[0]));	+	FileInputFormat.addInputPath(job, new Path(args[0]));       // Input path is on command line.
-	FileOutputFormat.setOutputPath(job, new Path(args[1]));	+	FileOutputFormat.setOutputPath(job, new Path(args[1]));     // Output path is on command line too.
	return job.waitForCompletion(true) ? 0 : 1;		return job.waitForCompletion(true) ? 0 : 1;

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