Mapper interface vs class
2 Answer(s)
DeZyre Support
hi Lakshman,
Yes, it's possible to emit multiple K,V pairs. By default all Map/reduce programs emit multiple of them.
Jun 11 2015 07:16 PM
Yes, it's possible to emit multiple K,V pairs. By default all Map/reduce programs emit multiple of them.
Lakshman
I think my question is not clear.
Interface API signature:
public void map(K key, V val, OutputCollector output, Reporter reporter).
Class API Signature:
map(Object key, Text value, Context context)
The question is to push multiple K,V pairs do I need to implement Mapper interface or I could just push K,V with context? what are the differences/use cases?
Jun 11 2015 07:35 PM
Interface API signature:
public void map(K key, V val, OutputCollector
Class API Signature:
map(Object key, Text value, Context context)
The question is to push multiple K,V pairs do I need to implement Mapper interface or I could just push K,V with context? what are the differences/use cases?