| Class | Description | 
|---|---|
| BoundedSourceTask<O> | 
 BoundedSourceTask. 
 | 
| MetricCollectionBarrierTask | 
 MetricCollectionBarrierTask. 
 | 
| OperatorTask | 
 OperatorTask. 
 | 
| PhysicalPlan | 
 A job's physical plan, to be executed by the Runtime. 
 | 
| PhysicalPlanGenerator | 
 A function that converts an IR DAG to physical DAG. 
 | 
| PhysicalStage | 
 PhysicalStage. 
 | 
| PhysicalStageEdge | 
 Contains information stage boundary  
StageEdge. | 
| ScheduledTaskGroup | 
 A ScheduledTaskGroup is a grouping of  
Task that belong to a stage. | 
| Task | 
 Task. 
 | 
| UnboundedSourceTask | 
 UnboundedSourceTask. 
 | 
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