hadoop jar hadoop-test-1.0.3.jar mrbench -inputLines 500 -maps 8 -reduces 50
注意, inputLines 选项默认为1, 如果不设的话,会导致输入数据过小,则后面无论你maps参数设置多少,在作业初始化时InputFormat的getSplits函数会根据maps参数的数据计算平均每块的数据大小,若数据过小则总的splits数目,即maps数目则设置为默认值2, 查了1个小时才查明白怎么回事。。。。
他妹的...
PS: 此外,在修改JobClietn代码后,log4j里增加了一句:log4j.logger.org.apache.hadoop.mapred.JobClient=DEBUG, 然后发现其Log输出都在console上面不知道是咋回事。
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