配置集羣
- 配置yarn-env.sh
配置一下JAVA_HOME
export JAVA_HOME=/opt/module/jdk1.8.0_144
- 配置yarn-site.xml
<!-- Reducer獲取數據的方式 -->
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
<!-- 指定YARN的ResourceManager的地址 -->
<property>
<name>yarn.resourcemanager.hostname</name>
<value>hadoop101</value>
</property>
- 配置:mapred-env.sh
配置一下JAVA_HOME
export JAVA_HOME=/opt/module/jdk1.8.0_144
- 配置: (對mapred-site.xml.template重新命名爲) mapred-site.xml
[liujh@hadoop101 hadoop]$ mv mapred-site.xml.template mapred-site.xml
[liujh@hadoop101 hadoop]$ vi mapred-site.xml
<!-- 指定MR運行在YARN上 -->
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
啓動集羣
- 啓動前必須保證NameNode和DataNode已經啓動
- 啓動ResourceManager
[liujh@hadoop101 hadoop-2.7.2]$ sbin/yarn-daemon.sh start resourcemanager
- 啓動NodeManager
[liujh@hadoop101 hadoop-2.7.2]$ sbin/yarn-daemon.sh start nodemanager
集羣操作
- YARN的瀏覽器頁面查看 http://hadoop101:8088/cluster
- 刪除文件系統上的output文件
[liujh@hadoop101 hadoop-2.7.2]$ bin/hdfs dfs -rm -R /user/liujh/output
- 執行MapReduce程序
[liujh@hadoop101 hadoop-2.7.2]$ bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.2.jar wordcount /user/liujh/input /user/liujh/output
- 查看運行結果
[liujh@hadoop101 hadoop-2.7.2]$ bin/hdfs dfs -cat /user/liujh/output/*
簡書:https://www.jianshu.com/u/0278602aea1d
CSDN:https://blog.csdn.net/u012387141
特別感謝:尚硅谷教育