My Spark source core SparkContext walkthrough full record

My Spark source core SparkContext walkthrough full record

Dirver Program (SparkConf) package org.apache.spark.SparkConf

Master package org.apache.spark.deploy.master

SparkContext package org.apache.spark.SparkContext

Stage package org.apache.spark.scheduler.Stage

Task package org.apache.spark.scheduler.Task

DAGScheduler package org.apache.spark.scheduler

TaskScheduler package org.apache.spark.scheduler.TaskScheduler

TaskSchedulerImpl package org.apache.spark.scheduler

Worker package org.apache.spark.deploy.worker

Executor package org.apache.spark.executor

BlockManager package org.apache.spark.storage

TaskSet package org.apache.spark.scheduler

/ / Create and start the scheduler

Val (sched, ts) = SparkContext.createTaskScheduler (this, master)

_ schedulerBackend = sched

_ taskScheduler = ts

_ dagScheduler = new DAGScheduler (this)

_ heartbeatReceiver.send (TaskSchedulerIsSet)

/ * *

* Create a task scheduler based on a given master URL.

* Return a 2-tuple of the scheduler backend and the task scheduler.

, /

Private def createTaskScheduler (

Sc: SparkContext

Master: String): (SchedulerBackend, TaskScheduler) = {

Master match {

Case "local" = >

Instantiate a

Val scheduler = new TaskSchedulerImpl (sc)

Build the masterUrls:

Val masterUrls = localCluster.start ()

It is said to be a very critical backend:

Val backend = new SparkDeploySchedulerBackend (scheduler, sc, masterUrls)

Scheduler.initialize (backend)

Backend.shutdownCallback = (backend: SparkDeploySchedulerBackend) = > {

LocalCluster.stop ()

}

(backend, scheduler)