Hadoop Help............. :-)

Hadoop Commands help :---
https://hadoop.apache.org/docs/r1.2.1/commands_manual.pdf

Others help :-
http://www.sourcecodeprojects.com/1348212/

http://mail-archives.apache.org/mod_mbox/hadoop-common-dev/201304.mbox/%3C1E78BB408127024980701F5109794685027B13CE73@exch-mbx-121.vmware.com%3E

http://stackoverflow.com/questions/6385888/what-are-some-good-resources-for-studying-hadoops-source-code

http://developer.yahoo.com/hadoop/tutorial/module1.html

http://maprabu.blogspot.in/2013/07/hadoop-best-ebooks-hadoop-complete.html

http://it-ebooks.info/tag/hadoop/

http://docs.hortonworks.com/HDPDOCS/HDPv1.0.1.14/index.htm#About_Hortonworks_Data_Platform/Hardware_Recommendations_For_Apache_Hadoop.htm