Hadoop企业级集群架构 - Hadoop安装
1. 在h1.hadoop上解压并配置hadoop-2.5.2
2. 在hadoop安装目录下，创建tmp,data目录
3. 使用awk命令创建复制脚本 （java, hadoop-2.5.2)
awk '{ print "scp -rp hadoop-2.5.2 " $1 ":/home/grid" }' /home/grid/hadoop-2.5.2/etc/hadoop/slaves >dd.sh
source ./dd.sh
awk '{ print "scp -rp jdk1.7.0_79 " $1 ":/home/grid" }' /home/grid/hadoop-2.5.2/etc/hadoop/slaves >dd_java.sh
source ./dd_java.sh
4. 格式化namenode
bin/hdfs namenode -format
5. 启动Hadoop
sbin/start-dfs.sh
sbin/start-yarn.sh
6. 检查进程
/home/grid/jdk1.7.0_79/bin/jps
Master节点：
h1.hadoop.com
Sencod namenode节点:
h2.hadoop.com
其它3个datanoe节点：
h3.hadoop.com
h4.hadoop.com
h5.hadoop.com
7.运行示例
7.1 准备输入
mkdir input
cd input
echo "hello word" >test1.txt
echo "hello hadoop" >test2.txt
bin/hadoop fs -put /home/grid/hadoop-2.5.2/input /in
bin/hadoop fs -ls -R /in
7.2 运行示例
bin/hadoop jar /home/grid/hadoop-2.5.2/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.2.jar wordcount /in/* /out
8. 查看结果
bin/hadoop fs -ls -R /out
bin/hadoop fs -cat /out/part-r-00000
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