mahout 安装和简单测试

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1安装环境

hadoop 节点列表

2安装步骤

2.1 解压mahout-distribution-0.4.tar.gz

tar -axvf mahout-distribution-0.4.tar.gz

2.2 将文件重名为mahout

mv mahout-distribution-0.4 mahout

2.3 修改~/.bashrc文件,增加下面的几行数据

export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk-amd64
export HADOOP_HOME=/usr/local/hadoop
export HADOOP_CONF_DIR=/usr/local/hadoop/conf
export MAHOUT_HOME=/usr/local/mahout
export MAHOUT_CONF_DIR=/usr/local/mahout/conf
export PATH=$PATH:$HADOOP_HOME_DIR:$HADOOP_HOME/bin:$MAHOUT_HOME/conf:$MAHOUT_HOME/bin

2.4 重新启动服务器,要不上面设置的信息不起作用

2.5 启动hadoop,测试mahout是否安装成功

mahout

2.6 下载mahout测试数据

wget http://archive.ics.uci.edu/ml/databases/synthetic_control/synthetic_control.data

2.7 hadoop创建测试目录

2.8 上传测试数据

2.9 启动kmeans算法,开始测试

mahout org.apache.mahout.clustering.syntheticcontrol.kmeans.Job

2.10查看结果

3问题

tianbx@localhost :/usr/local/mahout/bin$  ./mahout --help
MAHOUT_LOCAL is not set; adding HADOOP_CONF_DIR to classpath.
Exception in thread "main" java.lang.NoClassDefFoundError: classpath
Caused by: java.lang.ClassNotFoundException: classpath
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: classpath. Program will exit.
Running on hadoop, using /usr/local/hadoop/bin/hadoop and HADOOP_CONF_DIR=/usr/local/hadoop/conf

原因:一开始我按装的是mahout0.8,而hadoop是0.2,版本之间的兼容问题.

解决办法:不安装mahout0.8,换成mahout0.4 就可以了.