What is the use of Java in hadoop?

I see an incoming offer. Am I the only one?

 

Because it is written in Java.

Hadoop is a sub project from Nutch. Nutch is part of Lucene. Lucene was written in Java right from the start (portability in mind).

 

As hadoop APIs are written in java the use of java to write down map-reduce program gives most effective performance.

 

Hadoop was initially sub project of the open search engine Nutch. The Nutch team at that point of time was more comfortable in using java rather than any other programming language