我试图在cdh4.2中启动hive，我遇到了以下问题

hive
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/util/PlatformName
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.util.PlatformName
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: org.apache.hadoop.util.PlatformName.  Program will exit.
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/util/RunJar
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.util.RunJar
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: org.apache.hadoop.util.RunJar.  Program will exit.

以下是供参考的环境参数。我错过什么了吗？
echo$hadoop\u conf\u dir/etc/hadoop/conf/conf.pseudo文件
echo$hadoop\u home/usr/lib/hadoop-0.20-mapreduce
echo$classpath/usr/lib/hadoop-0.20-mapreduce/hadoop-core.jar/usr/lib/hadoop/hadoop-auth-2.0.0-cdh4.2.0.jar/usr/lib/hadoop-0.20-mapreduce/。；
回声$hive\U home
如果您想查看我在这里可能缺少的任何其他环境变量，请告诉我。