FAQ

On Oct 26, 2009, at 6:05 PM, Jeff Zhang wrote:

I'd like to know does the map task push map output to reduce task or
reduce
task pull it from map task ? Which way is real in hadoop ?
In 0.19, it appears to be a pull. Look at the run() method in mapred/
org/apache/hadoop/mapred/ReduceTask.java. Don't
know what the equivalent would be in the mapreduce package
in 0.20.x.

dave bayer

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