how to deal with large amount of key value pair outputs in one run of map task

[Eric Zhang]

Hi, 
I have a hadoop application where each run of the map could potentially
generate large amount of key value pairs,  so it caused the run of memory
error.  I am wondering if there is a way to inform hadoop to write the key
value pairs to disk  periodically?
 
thanks,  
 
Eric Zhang
Vespa content @Yahoo!
Work: 408-349-2466