I believe that bytes read is the total volume of data read into the mappers,
whereas local bytes read refers to the bytes read from map tasks which could
be scheduled on machines that already held local copies of their inputs. So
the ratio denotes a rough measure of scheduler locality efficiency.
- Aaron
On Tue, May 19, 2009 at 12:54 PM, Foss User foss...@gmail.com wrote:
When we see the job details on the job tracker web interface, we see
bytes read as well as local bytes read. What is the difference
between the two?
