Guys,
I was trying to figure out some counters from the job history files. For 
reducers, I am trying to find, which reducer is writing to HDFS(i.e. last 
reducers in the job's chain of vertices). 

For Map vertices, they have an HDFS: BYTES_WRITTEN, HDFS: BYTES_READ counters 
which makes sense. However, I could not find the corresponding ones for 
reducers, other than the OUTPUT bytes. 

Do I miss something ?
Thanks for your help,Robert

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