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From arun k <arunk...@gmail.com>
Subject Re: Capturing Map/reduce task run times and bytes read
Date Sat, 03 Dec 2011 07:09:46 GMT

Sorry for creating confusion.
The question is if i have a single node setup and i give Sysout statements
in maptask.java and reducetask.java.
{HADOOP_HOME}$ant build
{HADOOP_HOME}$start all daemons
{HADOOP_HOME}$ run wordcount example

Yes i am able to see o/p in *.out files of tasktrackers.

Q>Does the map/reduce task run time displayed in web GUI is decent/accurate
enough ?
Q>If i want to do find the IO rate of a task, will the task run time
divided by total number of FIle bytes and HDFS bytes read/written give it
approximately ?
Q>Does the FILE Bytes read for the reduce task include the map output
record bytes read non-locally over network or the bytes read locally from
the map output records after they are copied locally ?


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