title: Hadoop map tasks reading from same node statistics
body: <p>I am currently using Hadoop. I was wondering if I can get information about whether the map tasks for a given job are reading their data from its their own node or from other nodes. I know that HDFS is distributed among all the nodes, but is there any counters/metrics that would say, for a given job and a given map task, how much data was read from the same node the amp task is running, and how much data was read through the network.</p>