Hi,I would like to measure the disk i/o performance of our hadoop cluster. However, running iostat on 16 nodes is rather cumbersome. Does dfs keep track of any stats like the number of blocks or bytes read and written? From scanning the api, I found a class called "org.apache.hadoop.fs.FileSystem.Statistics" that could be relevant. Does anyone know if this is what I'm looking for?
Thanks, Shirley
