Read and Write throughputs via JVM

[Matthew John <tm...@gmail.com>]

Hi all,

I wanted to figure out the Read and Write throughputs that happens in
a Map task (Read - reading from the input splits, Write - writing the
map output back) inside a JVM. Do we have any counters that can help
me with this? Or where exactly should I focus on tweaking the code to
add some additional time stamp outputs (for example - time stamp maybe
at the start and end of Map read).

Thanks,
Matthew John