Hadoop is supported by GNU/Linux platform and its flavors. CONFIGURATIONS are specified by resources. A resource contains a set of name/value pairs as XML data. Each resource is named by either a String or by a Path. If named by a String, then the classpath is examined for a file with that name. If named by a Path, then the local filesystem is examined directly, without referring to the classpath.
The next step is to set up the PATH environment variables. You can set them as following:
Login as root user
Copy the java path as
Login as object user
To check the hadoop version
Cmd: hadoop version
Login as object user.
Cmd: sudo/etc/init. d/hadoop-0.20-namenode start
Repeat the command for all the daemon such as data node, secondary name node, job tracker, task.
Login as root user.
Add your host name instead of local host in the file.
Before formatting the Name Node, we have to assign users to the daemons in HDFS
Cmd: export HADOOP NAME NODE-USER=hdfs
Cmd: export Hadoop-Secondary Name Node-user=hdfs
Cmd: export Hadoop DATA NODE hdfs JDB TRACKER hdfs=map red
Log in as object user
Cmd: hadoop Name Node-format
To format the name node
Start all the services for hdfs
Cmd: hadoop fs-ls/
Now the hadoop configuration is finished.
Cmd: jps[To check all the daemons]
Log in as root user
Cmd: yum install hadoop-0.20*
Now, all the files and libraries which are related to hadoop [i.e. remains supported for those, which are not installed previously]
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