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Joining two tables in Hadoop MapReduce Join.

avatar
New Contributor

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 ?

 

1 REPLY 1

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Master Guru

Don't use Map Reduce anymore.

 

It's time to move to Spark or Flink.