look at using coroutines to ease blocking

[kierse]

• look at utilizing coroutines throughout MR to limit I/O blocking
• can be used
  • when retrieving sources
  • when reading from/pushing to queue
  • loading application and logging config files
• see the following for more detail: http://code.activestate.com/recipes/577129-run-asynchronous-tasks-using-coroutines/ http://docs.python.org/library/threading.html