thanks, i also tried using HADOOP_PREFIX but that didn't work. I still get the same error: Could not find or load main class org.apache.hadoop.hdfs.server.namenode.NameNode
btw, how do we install hadoop-common and hadoop-hdfs? also, according to this link, http://hadoop.apache.org/docs/r0.23.9/hadoop-project-dist/hadoop-common/SingleCluster.html, there are several other variables to set. $HADOOP_COMMON_HOME $HADOOP_HDFS_HOME $HADOOP_MAPRED_HOME $YARN_HOME where do we set these directories? i tried to set these as follows, which still did not help to get rid of the error message. $HADOOP_COMMON_HOME=${HADOOP_PREFX}/share/hadoop/common $HADOOP_HDFS_HOME=${HADOOP_PREFX}/share/hadoop/hdfs $HADOOP_MAPRED_HOME=${HADOOP_PREFX}/share/hadoop/mapreduce $YARN_HOME=${HADOOP_PREFX}/share/hadoop/yarn interestingly, that link never talks about HADOOP_PREFIX. On Sun, Aug 11, 2013 at 3:21 AM, Harsh J <ha...@cloudera.com> wrote: > I don't think you ought to be using HADOOP_HOME anymore. > > Try "unset HADOOP_HOME" and then "export HADOOP_PREFIX=/opt/hadoop" > and retry the NN command. > > On Sun, Aug 11, 2013 at 8:50 AM, Jane Wayne <jane.wayne2...@gmail.com> > wrote: > > hi, > > > > i have downloaded and untarred hadoop v0.23.9. i am trying to set up a > > single node instance to learn this version of hadop. also, i am following > > as best as i can, the instructions at > > > http://hadoop.apache.org/docs/r0.23.9/hadoop-project-dist/hadoop-common/SingleCluster.html > > . > > > > when i attempt to run ${HADOOP_HOME}/bin/hdfs namenode -format, i get the > > following error. > > > > Error: Could not find or load main class > > org.apache.hadoop.hdfs.server.namenode.NameNode > > > > the instructions in the link above are complete. they jump right in and > > say, "assuming you have installed hadoop-common/hadoop-hdfs..." what does > > this assumption even mean? how do we install hadoop-common and > hadoop-hdfs? > > > > right now, i am running on CentOS 6.4 x64 minimal. my steps are the > > following. > > > > 0. installed jdk 1.7 (Oracle) > > 1. tar xfz hadoop-0.23.9.tar.gz > > 2. mv hadoop-0.23.9 /opt > > 3. ln -s /opt/hadoop-0.23.9 /opt/hadoop > > 4. export HADOOP_HOME=/opt/hadoop > > 5. export JAVA_HOME=/opt/java > > 6. export PATH=${JAVA_HOME}/bin:${HADOOP_HOME}/bin:${PATH} > > > > any help is appreciated. > > > > -- > Harsh J >
