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From Abdul Navaz <navaz....@gmail.com>
Subject Hadoop shuffling traffic
Date Fri, 26 Sep 2014 00:36:46 GMT
Hello,

I am having a Hadoop cluster with 1 name node and 3 data nodes. I running
sample word count job on 1GB of file which is distributed among the HDFS.

When I run the map reduce job, before even completing the mapping 100 %
reduce starts.  Say for eg map 40% reduce 10% etc.

I would like to know when the shuffling traffic starts ?

->  Is there any way to find out when exactly shuffling started ?  Does it
generate any syslog in the logs .
-> How to find the total amount of shuffling traffic?



Thanks & Regards,

Abdul Navaz
Research Assistant
University of Houston Main Campus, Houston TX
Ph: 281-685-0388




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