Hello everyone.   I'm completely new in Hadoop Framework and I want to write a MapReduce program (HadoopJoin.java) that joins on x attribut between two tables R and S. The structure of the two tables is like :   R (tag : char, x : int, y : varchar(30)) and S (tag : char, x : int, z : varchar(30))   For example we have for R table :   r 10 r-10-0 r 11 r-11-0 r 12 r-12-0 r 21 r-21-0   And for S table :   s 11 s-11-0 s 21 s-41-0 s 21 s-41-1 s 12 s-31-0 s 11 s-31-1   The result should look like : r 11 r-11-0 s 11 s-11-0 etc.   Can anyone help me please ?   ... View more