hadoop-client是为了让开发者可以很方便的使用当前节点hadoop的jar包，ch4版本的hadoop将目录分为“/usr/lib/hadoop-hdfs”、“/usr/lib/hadoop-mapreduce”，“/usr/lib/hadoop-yarn”等多个目录，这样引用jar包也会比较麻烦。通过yum安装hadoop-client后会生成软链接：
- MRv1：/usr/lib/hadoop/client-0.20
- YARN：/usr/lib/hadoop/client
如果你的java应用需要引用这些系统jar包只需要下面的调用就可以了：
java -cp /usr/lib/hadoop/client/*:your.jar com.xx.xxx Main
当然你也可以使用maven将hadoop相关依赖jar都打到你的项目里面。
--end
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