Difference between revisions of "Scheduler Hook Points"
From Lawa
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The BlockPlacementPolicy interface and its default implementation BlockPalcementPolicyDefault, used to choose on which machine to put blocks (for each block). | The BlockPlacementPolicy interface and its default implementation BlockPalcementPolicyDefault, used to choose on which machine to put blocks (for each block). | ||
Latest revision as of 12:20, 3 July 2011
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.
Classes dealing with block placements
The BlockPlacementPolicy interface and its default implementation BlockPalcementPolicyDefault, used to choose on which machine to put blocks (for each block).
