@Gobi Subramani Please read the link so you can understand easily:- https://hadoop.apache.org/docs/r2.7.2/hadoop-yarn/hadoop-yarn-site/YARN.html https://hadoop.apache.org/docs/r2.7.2/hadoop-yarn/hadoop-yarn-site/ResourceManagerHA.html Every hadoop command internally calls a java utility for the further operations. org.apache.hadoop.fs.FsShell provide command line access to a FileSystem. hadoop fs -put internally calls the corresponding method from the above package. to undersatnd the fsshell code please go thorugh the link:- http://grepcode.com/file/repo1.maven.org/maven2/com.ning/metrics.collector/1.1.0/org/apache/hadoop/fs/FsShell.java
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