Do not use HADOOP_HOME anymore. Try removing the below line (and any other references in your env to HADOOP_HOME):
export HADOOP_HOME="/hadoop-2.0.4-alpha" On Thu, Jun 6, 2013 at 1:18 AM, Boyu Zhang <[email protected]> wrote: > Dear All, > > I just moved from version 0.20.2 to 2.0.4, there are a lot of changes Hadoop > has been going through! > > I followed the instructions here: > http://hadoop.apache.org/docs/r2.0.4-alpha/hadoop-project-dist/hadoop-common/SingleCluster.html > > I changed the hadoop-2.0.4-alpha/etc/hadoop/hadoop-env.sh: > > export JAVA_HOME="/usr" > export HADOOP_HOME="/hadoop-2.0.4-alpha" > export HADOOP_COMMON_HOME="/hadoop-2.0.4-alpha/share/hadoop/common" > export HADOOP_HDFS_HOME="/hadoop-2.0.4-alpha/share/hadoop/hdfs" > export HADOOP_MAPRED_HOME="/hadoop-2.0.4-alpha/share/hadoop/mapreduce" > export HADOOP_YARN_HOME="/hadoop-2.0.4-alpha/share/hadoop/mapreduce" > > But when I tried to format the namenode using: bin/hdfs namenode -format, I > got the following error: > > Exception in thread "main" java.lang.NoClassDefFoundError: > org/apache/hadoop/hdfs/server/namenode/NameNode > Caused by: java.lang.ClassNotFoundException: > org.apache.hadoop.hdfs.server.namenode.NameNode > at java.net.URLClassLoader$1.run(URLClassLoader.java:217) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(URLClassLoader.java:205) > at java.lang.ClassLoader.loadClass(ClassLoader.java:323) > at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) > at java.lang.ClassLoader.loadClass(ClassLoader.java:268) > at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:336) > Could not find the main class: > org.apache.hadoop.hdfs.server.namenode.NameNode. Program will exit. > > I tried to add the jar files in the /share/hadoop/common, hdfs, mapreduce > into the CLASSPATH, but still I get the same error. > > Could anyone give any directions on what may go wrong? > > Thanks, > Boyu -- Harsh J
