Running 1.0.2, in this case on Linux. I was watching the processes / loads on one TaskTracker instance and noticed that it completed it's first 8 map tasks and reported 8 free slots (the max for this system). It then waited doing nothing for more than 30 seconds before the next "batch" of work came in and started running.
Likewise it also has relatively long periods with all 8 cores running at or near idle. There are no jobs failing or obvious errors in the TaskTracker log. What could be causing this? Should I increase the number of map jobs to greater than number of cores to try and keep it busier? -Terry
