Hi, To start with Hadoop can you follow the below links .. where a working VM is being shared by Yahoo team.
http://developer.yahoo.com/hadoop/tutorial/index.html http://developer.yahoo.com/hadoop/tutorial/module3.html Once you are comfortable with hadoop and after gaining a basic confidence with hadoop you may compare the working environment with your setup to resolve your issue. Hope this helps, Thanks, -Vikas. On Fri, Jan 15, 2010 at 4:58 PM, jayalakshmi sandhya < [email protected]> wrote: > Oh!!Ya sure.. I ll paste the text here.. > > > > When I type these cmds in terminal, > > sand...@sandhya-laptop:/usr/local/hadoop$ bin/hadoop jar > hadoop-*-examples.jar grep input output 'dfs[a-z.]+' > > (or) > > sand...@sandhya-laptop:/usr/local/hadoop$ bin/hadoop namenode –format > > I get this error > > Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad > version number in .class file > > at java.lang.ClassLoader.defineClass1(Native Method) > > at java.lang.ClassLoader.defineClass(ClassLoader.java:620) > > at > java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) > > at > java.net.URLClassLoader.defineClass(URLClassLoader.java:260) > > at > java.net.URLClassLoader.access$100(URLClassLoader.java:56) > > at java.net.URLClassLoader$1.run(URLClassLoader.java:195) > > at java.security.AccessController.doPrivileged(Native > Method) > > at > java.net.URLClassLoader.findClass(URLClassLoader.java:188) > > at java.lang.ClassLoader.loadClass(ClassLoader.java:306) > > at > sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268) > > at java.lang.ClassLoader.loadClass(ClassLoader.java:251) > > at > java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) > > Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad > version number in .class file > > at java.lang.ClassLoader.defineClass1(Native Method) > > at java.lang.ClassLoader.defineClass(ClassLoader.java:620) > > at > java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) > > at > java.net.URLClassLoader.defineClass(URLClassLoader.java:260) > > at > java.net.URLClassLoader.access$100(URLClassLoader.java:56) > > at java.net.URLClassLoader$1.run(URLClassLoader.java:195) > > at java.security.AccessController.doPrivileged(Native > Method) > > at > java.net.URLClassLoader.findClass(URLClassLoader.java:188) > > at java.lang.ClassLoader.loadClass(ClassLoader.java:306) > > at > sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268) > > at java.lang.ClassLoader.loadClass(ClassLoader.java:251) > > at > java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) > > sand...@sandhya-laptop:/usr/local/hadoop$ > > > > > > *Actually there was a step after installing hadoop like-* > > > > Unpack the downloaded Hadoop distribution. In the distribution, edit the > file conf/hadoop-env.sh to define at least JAVA_HOME to be the root of your > Java installation. > > > > So this is my conf/hadoop-env.sh , > > > > # Set Hadoop-specific environment variables here. > > > > # The only required environment variable is JAVA_HOME. All others are > > # optional. When running a distributed configuration it is best to > > # set JAVA_HOME in this file, so that it is correctly defined on > > # remote nodes. > > > > # The java implementation to use. Required. > > *export JAVA_HOME=/home/sandhya/jdk # I CHANGED HERE .. MY JAVA > INSTALLATION IS IN THIS PATH* > > # Extra Java CLASSPATH elements. Optional. > > # export HADOOP_CLASSPATH= > > > > # The maximum amount of heap to use, in MB. Default is 1000. > > export HADOOP_HEAPSIZE=2000 # I CHANGED HERE > > > > # Extra Java runtime options. Empty by default. > > export HADOOP_OPTS=-server > > > > # Command specific options appended to HADOOP_OPTS when specified > > export HADOOP_NAMENODE_OPTS="-Dcom.sun.management.jmxremote > $HADOOP_NAMENODE_OPTS" > > export HADOOP_SECONDARYNAMENODE_OPTS="-Dcom.sun.management.jmxremote > $HADOOP_SECONDARYNAMENODE_OPTS" > > export HADOOP_DATANODE_OPTS="-Dcom.sun.management.jmxremote > $HADOOP_DATANODE_OPTS" > > export HADOOP_BALANCER_OPTS="-Dcom.sun.management.jmxremote > $HADOOP_BALANCER_OPTS" > > export HADOOP_JOBTRACKER_OPTS="-Dcom.sun.management.jmxremote > $HADOOP_JOBTRACKER_OPTS" > > # export HADOOP_TASKTRACKER_OPTS= > > # The following applies to multiple commands (fs, dfs, fsck, distcp etc) > > # export HADOOP_CLIENT_OPTS > > > > # Extra ssh options. Empty by default. > > # export HADOOP_SSH_OPTS="-o ConnectTimeout=1 -o SendEnv=HADOOP_CONF_DIR" > > > > # Where log files are stored. $HADOOP_HOME/logs by default. > > # export HADOOP_LOG_DIR=${HADOOP_HOME}/logs > > > > # File naming remote slave hosts. $HADOOP_HOME/conf/slaves by default. > > # export HADOOP_SLAVES=${HADOOP_HOME}/conf/slaves > > > > # host:path where hadoop code should be rsync'd from. Unset by default. > > # export HADOOP_MASTER=master:/home/$USER/src/hadoop > > > > # Seconds to sleep between slave commands. Unset by default. This > > # can be useful in large clusters, where, e.g., slave rsyncs can > > # otherwise arrive faster than the master can service them. > > # export HADOOP_SLAVE_SLEEP=0.1 > > > > # The directory where pid files are stored. /tmp by default. > > # export HADOOP_PID_DIR=/var/hadoop/pids > > > > # A string representing this instance of hadoop. $USER by default. > > # export HADOOP_IDENT_STRING=$USER > > > > # The scheduling priority for daemon processes. See 'man nice'. > > # export HADOOP_NICENESS=10 > > > > When I googled, I got to know this- > > > > *That's because you're using classes compiled with different versions of > Java.** > > Typically if you use a j1.5 compiled class in a J1.4 JVM, it's not going to > work.* > > * * > > I do not know how I shud verify the above statements. But,Actually I had > another installation of java , now I removed that version. > > > > > > > > > > > > > > > > On Fri, Jan 15, 2010 at 3:25 PM, vikas <[email protected]> wrote: > > > But the attachment is missing ... it is better you paste your text in the > > mail itself. > > > > -Vikas. > > > > > > > > On Fri, Jan 15, 2010 at 2:32 PM, jayalakshmi sandhya < > > [email protected]> wrote: > > > > > Hi.. I downloaded and installed hadoop. When i was setting up the > nodes, > > > following the instructions given in Apache hadoop's- Quickstart, i got > > one > > > problem. Am not able to proceed futher. Pl help me out.. > > > > > > I have explained the prob in detail, in the attached document. > > > > > > regards- > > > Sandhya > > > > > >
