StageScheduler (trino-main 370 API)

All Superinterfaces:

AutoCloseable, Closeable

All Known Implementing Classes:

FixedCountScheduler, FixedSourcePartitionedScheduler, ScaledWriterScheduler
```
public interface StageScheduler
extends Closeable
```

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`default void`	`close()`
`ScheduleResult`	`schedule()`	Schedules as much work as possible without blocking.
`default void`	`start()`	Called by the query scheduler when the scheduling process begins.

- Method Detail
  - start
```
default void start()
```
    Called by the query scheduler when the scheduling process begins. This method is called before the ExecutionSchedule takes a decision to schedule a stage but after the query scheduling has been fully initialized. Within this method the scheduler may decide to schedule tasks that are necessary for query execution to make progress. For example the scheduler may decide to schedule a task without assigning any splits to unblock dynamic filter collection.
  - schedule
```
ScheduleResult schedule()
```
    Schedules as much work as possible without blocking. The schedule results is a hint to the query scheduler if and when the stage scheduler should be invoked again. It is important to note that this is only a hint and the query scheduler may call the schedule method at any time.
  - close
```
default void close()
```
    Specified by:
    
    close in interface AutoCloseable
    
    Specified by:
    
    close in interface Closeable