How to get size of read/write data for each task of mapreduce job?

[#1]

HI,

There are 250 tasks in my mapreduce job. I would to retrieve take time and size of read/write data for each task.

Take time : I can have all in resource manager.

Size of data : I can click each task in resource manager and get he size of data reading and writing.

Is there any way or tool I can collect the information of data size quickly? Not have to go through each link of task.

Thanks,

Ta-Ting

[#2]

For each mapper you can log split size (or output it to seprate file using multioutputformat) in setup function with something like this

context.getInputSplit().getLength()