What happens if mapper output does not match reducer input?
A. No, Hadoop does not provide techniques for custom datatypes.
B. Yes, but only for mappers.
C. Yes, custom data types can be implemented as long as they implement writable interface.
D. Yes, but only for reducers.
Answer:C
What happens if mapper output does not match reducer input?
A. No, Hadoop does not provide techniques for custom datatypes. B. Yes, but only for mappers. C. Yes, custom data types can be implemented as long as they implement writable interface. D. Yes, but only for reducers.