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	<title>二次排序 - 四号程序员</title>
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		<title>[转]Hadoop MapReduce 二次排序原理及其应用</title>
		<link>https://www.coder4.com/archives/4248</link>
					<comments>https://www.coder4.com/archives/4248#respond</comments>
		
		<dc:creator><![CDATA[coder4]]></dc:creator>
		<pubDate>Fri, 16 May 2014 06:16:38 +0000</pubDate>
				<category><![CDATA[大数据技术]]></category>
		<category><![CDATA[MapReduce]]></category>
		<category><![CDATA[setGroupingComparatorClass]]></category>
		<category><![CDATA[setOutputkeyComparatorClass]]></category>
		<category><![CDATA[setOutputValueGroupingComparator]]></category>
		<category><![CDATA[setSortComparatorClass]]></category>
		<category><![CDATA[二次排序]]></category>
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					<description><![CDATA[转载自：《Hadoop MapReduce 二次排序原理及应用》 关于二次排序主要涉及到这么几个东西： 在0.20.0以前使用的是 setPartitionerClass setOutputkeyComparatorClass setOutputValueGroupingComparator 在0.20.0以后使用是 job.setPartitionerClass(Partitioner p); job.setSortComparatorClass([......] 继续阅读]]></description>
		
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		<title>[转 ]Hadoop - How to do a secondary sort on values ?</title>
		<link>https://www.coder4.com/archives/3946</link>
					<comments>https://www.coder4.com/archives/3946#respond</comments>
		
		<dc:creator><![CDATA[coder4]]></dc:creator>
		<pubDate>Sun, 28 Jul 2013 11:33:30 +0000</pubDate>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[大数据技术]]></category>
		<category><![CDATA[Hadoop]]></category>
		<category><![CDATA[Reduce]]></category>
		<category><![CDATA[value 排序]]></category>
		<category><![CDATA[二次排序]]></category>
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					<description><![CDATA[关于在hadoop中，如何让reduce阶段同一个key下的values有序，一篇很好的文章，写的比《Hadoop权威指南》清楚！ 转载自： http://www.bigdataspeak.com/2013/02/hadoop-how-to-do-secondary-sort-on_25.html The problem at hand here is that you need to work upon a sorted values set in your reducer.[......] 继续阅读]]></description>
		
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