【Hadoop】YARN伪分布式部署和MapReduce案例

前言：
前几篇文章 我们介绍了HDFS组件的配置及启动，Yarn是Hadoop集群的资源与作业调度平台，下面介绍下Yarn的伪分布部署及MapReduce简单使用。

1.配置文件及启动

[hadoop@hadoop000 hadoop]$ pwd
/opt/software/hadoop-2.8.1/etc/hadoop
[hadoop@hadoop000 hadoop]$ cp mapred-site.xml.template mapred-site.xml
[hadoop@hadoop000 hadoop]$ vi mapred-site.xml
<configuration>
    <property>
        <name>mapreduce.framework.name</name>
        <value>yarn</value>
    </property>
</configuration>
[hadoop@hadoop000 hadoop]$ vi yarn-site.xml
<configuration>
    <property>
        <name>yarn.nodemanager.aux-services</name>
        <value>mapreduce_shuffle</value>
    </property>
</configuration>

[hadoop@hadoop000 hadoop]$ cd /opt/software/hadoop-2.8.1
[hadoop@hadoop000 hadoop-2.8.1]$ sbin/start-yarn.sh
starting yarn daemons
starting resourcemanager, logging to /opt/software/hadoop-2.8.1/logs/yarn-hadoop-resourcemanager-hadoop000.out
192.168.6.217: starting nodemanager, logging to /opt/software/hadoop-2.8.1/logs/yarn-hadoop-nodemanager-hadoop000.out
[hadoop@hadoop000 hadoop-2.8.1]$ jps
10512 ResourceManager --Yarn的进程
10004 SecondaryNameNode
9655 NameNode
10936 Jps
9806 DataNode
10623 NodeManager --Yarn的进程
#Yarn的两个进程:
   ResourceManager （资源管理）
   NodeManager     （节点管理）
#可参考官网：http://hadoop.apache.org/docs/r2.8.4/hadoop-project-dist/hadoop-common/SingleCluster.html

2.Yarn网站测试

3.MapReduce Job测试

[hadoop@hadoop000 hadoop-2.8.1]$ pwd
/opt/software/hadoop-2.8.1
[hadoop@hadoop000 hadoop-2.8.1]$ find ./ -name "*example*"
./lib/native/examples
./share/hadoop/mapreduce/sources/hadoop-mapreduce-examples-2.8.1-test-sources.jar
./share/hadoop/mapreduce/sources/hadoop-mapreduce-examples-2.8.1-sources.jar
./share/hadoop/mapreduce/lib-examples
./share/hadoop/mapreduce/hadoop-mapreduce-examples-2.8.1.jar
./share/doc/hadoop/hadoop-mapreduce-examples
./share/doc/hadoop/hadoop-yarn/hadoop-yarn-common/apidocs/org/apache/hadoop/yarn/webapp/example
./share/doc/hadoop/hadoop-auth-examples
./share/doc/hadoop/api/org/apache/hadoop/examples
./share/doc/hadoop/api/org/apache/hadoop/security/authentication/examples
./etc/hadoop/ssl-server.xml.example
./etc/hadoop/ssl-client.xml.example
[hadoop@hadoop000 hadoop-2.8.1]$ bin/hadoop jar ./share/hadoop/mapreduce/hadoop-mapreduce-examples-2.8.1.jar pi 5 10

4.结果解读