What is the difference between Map-side join and Reduce-side join

Question

Can someone tell me the difference between a Map-side join and Reduce-side join?

Answer 1

Join is a clause that combines the records of two tables. 

In Map-side join, all the task to join the records will be done by the mapper. This type of join is suitable for small sized tables.

In Reduce-side join, the join task will be done by the reducer. 

To know more differences, you can refer this link