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2012/02/05 21:45 straka 2012/02/05 21:44 straka 2012/02/05 21:40 straka 2012/02/05 19:16 straka vytvořeno Go		2012/02/05 21:45 straka 2012/02/05 21:44 straka 2012/02/05 21:40 straka 2012/02/05 19:16 straka vytvořeno Go Next revision Both sides next revision
courses:mapreduce-tutorial:making-your-job-configurable [2012/02/05 19:16] straka vytvořeno		courses:mapreduce-tutorial:making-your-job-configurable [2012/02/05 21:40] straka
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-	====== MapReduce Tutorial : ======	+	====== MapReduce Tutorial : Making your job configurable ======
		+
		+	Sometimes it is desirable for a Hadoop job to be configurable without recompiling/rewriting the source. This can be achieved:
		+	* both Perl and Java: use environment variables -- all environment variables are shared by the Hadoop job
		+	* Java only: use [[.:step-9|Hadoop properties]]:
		+	- when running the job, use ''/net/projects/hadoop/bin/hadoop job.jar -Dname1=value1 -Dname2=value2 ... input output''
		+	- in the job, use ''job.getConfiguration.get("name", default)'' to get the ''value'' as ''String'', or use one of ''getInt, getLong, getFloat, getRange, getFile, getStrings, ...''

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