yarn伪分布式部署：
官网要求：
YARN on Single Node
You can run a MapReduce job on YARN in a pseudo-distributed mode by setting a few parameters and running ResourceManager daemon and NodeManager daemon in addition.
The following instructions assume that 1. ~ 4. steps of the above instructions are already executed.
1、Configure parameters as follows:
etc/hadoop/mapred-site.xml:
etc/hadoop/yarn-site.xml:
2、Start ResourceManager daemon and NodeManager daemon:
$ sbin/start-yarn.sh
2、Browse the web interface for the ResourceManager; by default it is available at:
ResourceManager - http://localhost:8088/
4、Run a MapReduce job.
5、When you’re done, stop the daemons with:
$ sbin/stop-yarn.sh
1、复制一份新的mapred-site.xml模板文件，并重命名为mapred-site.xml
因为原本在hadoop这个文件夹里面是mapred-site.xml.template这个文件而没有mapred-site.xml文件，所以需要重命名
[hadoop@hadoop001 hadoop-2.6.0-cdh5.7.0]$ cd etc/hadoop
[hadoop@hadoop001 hadoop]$ cp mapred-site.xml.template mapred-site.xml
2、修改 mapred-site.xml文件内容：
替换成以下内容：
3、修改yarn-site.xml文件：
[hadoop@hadoop001 hadoop]$ vi yarn-site.xml
替换成以下内容：
4、启动ResourceManager进程和NodeManager进程
[hadoop@hadoop001 hadoop-2.6.0-cdh5.7.0]$ sbin/start-yarn.sh
[hadoop@hadoop001 hadoop-2.6.0-cdh5.7.0]$ jps
出现了ResourceManager进程和NodeManager进程，启动成功
5、进入web界面：
http://47.75.240.243:8088/
部署成功！！！
部署成功！！！mapreduce是没有进程的，计算是以yarn为载体即可，计算时直接提交到yarn上的
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