What are the prerequisites for learning Hadoop & big data?

[rashidacse]

For Hadoop, it depends on which part of the stack you're talking about.  For sure, you'll need to know how to use the GNU/Linux Operating System.  I'd also highly recommend programming knowledge and proficiency in Java, Scala, or Python.  Things like Storm give you multiple languages to with.  Things like Spark lend itself to Scala.  Most components are written in Java so there's a strong bias to having good Java skills (I personally don't write any Java).

"Big Data" is not a thing, but rather descriptive of a data management problem involving the 3 V's.  Big data isn't something you learn, its a problem you have.