spark-taskscheduler-FIFOSchedulableBuilder.adoc

FIFOSchedulableBuilder - SchedulableBuilder for FIFO Scheduling Mode

FIFOSchedulableBuilder is a SchedulableBuilder that is a mere wrapper around a single Pool (the only constructor parameter).

Note	FIFOSchedulableBuilder is the default SchedulableBuilder for TaskSchedulerImpl (see Creating TaskSchedulerImpl).

Note	When FIFOSchedulableBuilder is created, the TaskSchedulerImpl passes its own rootPool (that belongs to the TaskScheduler Contract that TaskSchedulerImpl follows).

FIFOSchedulableBuilder obeys the SchedulableBuilder Contract as follows:

• buildPools does nothing.

• addTaskSetManager passes the input Schedulable to the one and only rootPool Pool (using addSchedulable) and completely disregards the properties of the Schedulable.