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Re:"Should I still learn Java?" Answered: Yes. by nickolai on Friday January 14, 2011 @07:16AM (#2103261)
there is a C++ port of Lucene (named CLucene iirc) Not sure if there is such thing for Hadoop though.
Re:"Should I still learn Java?" Answered: Yes. by timr on Friday January 14, 2011 @09:58AM (#2103672)
Yeah, but because it's not the main project, the CLucene port is perpetually the red-headed stepchild. It runs several versions behind the Lucene trunk, and therefore, you have to choose to ignore its disadvantages.

...which is a shame, because I agree with the OP that the choice of Java was a mistake for a large, high-performance system.