| Class | Description | 
|---|---|
| LocalContainerLauncher | Runs the container task locally in a thread. | 
| MapReduceChildJVM | |
| MapTaskAttemptImpl | |
| ReduceTaskAttemptImpl | |
| TaskAttemptListenerImpl | This class is responsible for talking to the task umblical. | 
| WrappedJvmID | A simple wrapper for increasing the visibility. | 
| WrappedPeriodicStatsAccumulator | |
| WrappedProgressSplitsBlock | |
| YarnOutputFiles | Manipulate the working area for the transient store for maps and reduces. | 
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