I work for a big company and have 2.9 years of experience (Linux, Sybase, Java) but I'm not interested in my current job which has most of the domain expertise. I want to learn something new and pursue my career abroad. I find BigData-Hadoop is emerging. Will it be advisable to learn that now and switch?

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It will very easy for you to learn Big data technologies as you have hands on in Java ,Linux & RDBMS. Big data Hadoop has lot of opportunities for next 10 years.
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