Hadoop版本:
$ hadoop versionHadoop 0.20.2-cdh3u4Subversion git://ubuntu-slave01/var/lib/jenkins/workspace/CDH3u4-Full-RC/build/cdh3/hadoop20/0.20.2-cdh3u4/source -r 214dd731e3bdb687cb55988d3f47dd9e248c5690Compiled by jenkins on Mon May 7 13:01:39 PDT 2012From source with checksum a60c9795e41a3248b212344fb131c12c
Hadoop的OutputFormat和InputFormat 中有几个重要的文件分割属性参数,参数详情如下:
mapred.line.input.format.linespermap NLineInputFormat与TextInputFormat相同,但每个分片一定有N行。N在此处设置,默认1key.value.separator.in.input.line KeyValueTextInputFormat中,key和value之间的分隔符,默认为\tmapred.textoutputformat.separator OutputFormat中key和value之间的分隔符,默认为\t