mesos/spark — pull request #785 by anfeng (2013-08-06 18:48:53+00:00)
Title: expose HDFS file system stats via Executor metrics

This PR exposes HDFS stats via Executor metrics.

We support 2 HDFS schemes:
* hdfs ... Hadoop distributed file system
* file ... Hadoop local file system

For each scheme, we have the following gauges:
* Number of bytes written
* Number of read operations
* Number of large read operations
* Number of write operations