How to start learning hadoop [closed]

Answer 1

Answer 1 :

• It is very desirable to know Java. Hadoop is written in Java. Its popular Sequence File format is dependent on Java.
• Even if you use Hive or Pig, you'll probably need to write your own UDF someday. Some people still try to write them in other languages, but I guess that Java has more robust and primary support for them.
• Most Hadoop tools are not mature enough (like Sqoop, HCatalog and so on), so you'll see many Java error stack traces and probably you'll want to hack the source code someday

Answer 2

• It is not required for you to know Java.
• As the others said, it would be very helpful depending on how complex your processing may be. However, there is an incredible amount you can do with just Pig and say Hive.
• I would agree that it is fairly likely you will eventually need to write a user defined function (UDF), however, I've written those in Python, and it is very easy to write UDFs in Python.
• Granted, if you have very stringent performance requirements, then a Java based MapReduce program would be the way to go. However, great advancements in performance are being made all of the time in both Pig and Hive.
• So, the short answer to your question is, "No", it is not required for you to know Java in order to perform Hadoop development.

Source : http://www.linkedin.com/groups/Is-it-must-Hadoop-Developer-988957.S.141072851