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	<title>第八章 - 四号程序员</title>
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		<title>Hadoop The Definitive Guide 2nd读书笔记 – 第八章</title>
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		<pubDate>Wed, 17 Aug 2011 12:20:10 +0000</pubDate>
				<category><![CDATA[大数据技术]]></category>
		<category><![CDATA[Hadoop]]></category>
		<category><![CDATA[第八章]]></category>
		<category><![CDATA[读书笔记]]></category>
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					<description><![CDATA[1、计数器，用于Debug或者统计，毕竟分布式系统中，想要调个Bug是非常困难的，因为机器太多。。 2、Hadoop中有10多个内置的计数器，是默认就有的，例如HDFS读/写数据量，等等…… 3、用户可以自定义Counter，步骤如下： (1)Enum (2)reporter.incrCounter() (3)从Web管理界面或者getCounter中获得。 class MaxTemperatureWithCounters extends Configured impleme[......] 继续阅读]]></description>
		
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