hadoop-mapreduce-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Ajit Ratnaparkhi <ajit.ratnapar...@gmail.com>
Subject Max limit on count of elements in value list of reduce function
Date Thu, 19 Jan 2012 07:00:08 GMT
Hi,

I have a question regarding reduce functionality.

A reduce function receives key and list of values as argument, is there any
limit on count of value elements in value list which is received as
argument?
Can there be milions of elements in value list? Will it degrade performance
somehow? Does it keep all value elements of list in memory?

thanks,
Ajit.

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message