1 安装
＃brew install hadoop
安装的是2.6.0，，目录为/usr/local/Cellar/hadoop,如果想安装其他版本，则下载tar包解压即可。地址： 2 配置 将hadoop可执行路径bin和sbin都配置到环境变量中
export export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_67.jdk/Contents/homeexport /sbin/
接下来配置伪分布式： （1） 配置core－site.xml
hadoop cat core-site.xml>>hdfs://localhost:9000>
（2）hdfs的节点备份设置为1 配置hdfs-site.xml
hadoop cat hdfs-site.xml> >1>
（3）配置mapred-site.xml
hadoop cat mapred-site.xml> >hdfs://localhost:9000/>
（4）将hadoop-env.sh里jdk路径配置好即可。 然后执行：格式化namenode
hadoop namenode －format hadoop start-all.shThis script is Deprecated. Instead use start-dfs.sh and start-yarn.shthe classpath. Usage of hadoop-site.xml is deprecated. Instead use core-site.xml, mapred-site.xml and hdfs-site.xml to override properties of core-default.xml, mapred-default.xml and hdfs-default.xml respectivelynative-hadoop library for your platform… using builtin-java classes where applicableStarting namenodes on [localhost]localhost: namenode running as process 7082. Stop it first.localhost: datanode running as process 7163. Stop it first.Starting secondary namenodes []: secondarynamenode running as process 7266. Stop it first.the classpath. Usage of hadoop-site.xml is deprecated. Instead use core-site.xml, mapred-site.xml and hdfs-site.xml to override properties of core-default.xml, mapred-default.xml and hdfs-default.xml respectivelynative-hadoop library for your platform… using builtin-java classes where applicablestarting yarn daemonsresourcemanager running as process 7377. Stop it first.localhost: nodemanager running as process 7466. Stop it first. hadoop jps7163 DataNode9619 Jps7466 NodeManager7377 ResourceManager7082 NameNode7266 SecondaryNameNode hadoop
可以看到五个节点都启动了。 3 运行例子wordcount 先创建目录input 以及文件并上传到hdfs
libexec ls inputfile1.txt file2.txt libexec hadoop fs -put input/file*.txt /input libexec hadoop fs -ls /inputfound is deprecated, mapredhdfsoverride properties of core, mapredhdfsrespectively15/03/29 22:46:39 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform… using builtin-java classes where applicableFound 2 itemsr:02 /input/file1.txtr:02 /input/file2.txt libexec hadoop jar share/hadoop/mapreduce/hadoopjar wordcount /input /output运行如果不出错，结果输出到output目录如下： libexec hadoop fs -ls /outputfound is deprecated, mapredhdfsoverride properties of core, mapredhdfsrespectively15/03/29 22:56:30 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform… using builtin-java classes where applicableFound 2 itemsr:14 /output/_SUCCESSr:libexec hadoop fs /found is deprecated, mapredhdfsoverride properties of core, mapredhdfsrespectively15/03/29 22:56:51 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform… using builtin-java classes where applicableai 2am 3am2 1are 2i 2man 1man2 1shenya 2who 2you 1you2 1 libexec
其实，每个人都是幸福的。只是，你的幸福，常常在别人眼里。
