hi, I have some questions about Map-Reduce that I'm not sure, hope that you guys can help me.
- Does Map-Reduce support parallel writing/reading ? I think not because I don't find anything like that in the source code. And why the data of a input file are distributed on many data-nodes but the parallel concept isn't used. - What happens after the Map-Reduce operation ? I got the first example on http://hadoop.apache.org/core/docs/current/mapred_tutorial.html#Example%3A+WordCount+v1.0 So after the Map-Reduce operation we got < Bye, 1> < Goodbye, 1> < Hadoop, 2> < Hello, 2> < World, 2> But how can I know that the input file will be written/read correctly on the file system ? Any help will be appreciated, thanks. Tien Duc Dinh -- View this message in context: http://www.nabble.com/General-questions-about-Map-Reduce-tp21399361p21399361.html Sent from the Hadoop core-user mailing list archive at Nabble.com.
