Scheduler Hook Points

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Below are suspected locations of interest regarding the CDH3 (0.20.2) task scheduler: 

src/mapred/org/apache/hadoop/mapred/TaskScheduler.java - Topmost interface for all schedulers.

src/mapred/org/apache/hadoop/mapred/JobQueueTaskScheduler.java - Default FIFO Scheduler.

src/contrib/fairscheduler - Fair Scheduler.

src/contrib/capacity-scheduler - Another Scheduler.
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