Using map/reduce java classes in hive queries

Question

I read like, in hive queries we can use map/reduce scripts.

Can we use java map/reduce classes in Hive queries. If so, can you please provide me the sample.

Answer 1

Assume you have created your "MyMapper" and "MyReducer" classes and put them in a "mymr.jar" jar file. You can use them through streaming as such:

FROM (
FROM src
MAP inkey, inval
USING 'java -cp myjar.jar
com.myco.mymr.MyMapper'
AS k, v
CLUSTER BY k) mapout
REDUCE k, v
USING 'java -cp myjar.jar
com.myco.mymr.MyReducer'