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Configuration of Hadoop

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  • Last Updated May 08, 2017

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.

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Setting environment variables for Hadoop:-

The next step is to set up the PATH environment variables. You can set them as following:

Login as root user

   Cmd: cd/usr/lib/Hadoop-0.20/conf

   Cmd: ls

   Cmd:Vi hadoop-env.sh

   Copy the java path as

Export JAVA-HOME=/usr/java/jdhal.6
Export HADOOP-HEAPSIZE=2000

   Save

   Login as object user

   To check the hadoop version

    Cmd: hadoop version

To start the hadoop services:-

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.

Adding the host name in hadoop configuration file:-

Login as root user.

   Cmd: cd/usr/lib/hadoop-0.20/conf.

   Cmd:vi cove-site.xml

   Add your host name instead of local host in the file.

Save

Formatting the Name Node:-

   Cd/usr/lib/hadoop/bin/

   Cmd:ls

   Before formatting the Name Node, we have to assign users to the daemons in HDFS

   Cmd: export HADOOP NAME NODE-USER=hdfs

Frequently asked Hadoop Interview Questions

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: cd/usr/lib/.hadoop/bin/

   Cmd :ls

   Cmd: hadoop Name Node-format

   To format the name node

   Start all the services for hdfs

Cmd: /start-all.sh

   Cmd: cd/

   Cmd: hadoop fs-ls/

   Now the hadoop configuration is finished.

   Cmd: jps[To check all the daemons]

Installation of Library files:-

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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