StandaloneSchedulerBackend¶

StandaloneSchedulerBackend is a CoarseGrainedSchedulerBackend.

Creating Instance¶

StandaloneSchedulerBackend takes the following to be created:

• TaskSchedulerImpl
• SparkContext
• Standalone master URLs

StandaloneSchedulerBackend is created when:

• SparkContext is requested for a SchedulerBackend (and TaskScheduler) (for spark:// and local-cluster master URLs)

StandaloneAppClientListener¶

StandaloneSchedulerBackend is a StandaloneAppClientListener.

Starting SchedulerBackend¶

start(): Unit

start...FIXME

start creates a StandaloneAppClient and requests it to start.

start...FIXME

start is part of the SchedulerBackend abstraction.

StandaloneAppClient¶

StandaloneSchedulerBackend creates a StandaloneAppClient (with itself as a StandaloneAppClientListener) when requested to start.

StandaloneAppClient is started with StandaloneSchedulerBackend.

StandaloneAppClient is stopped with StandaloneSchedulerBackend.

StandaloneAppClient is used for the following:

• doRequestTotalExecutors
• doKillExecutors