spark源码系列03-任务提交01：blog.csdn.net/qq_19968255…
12. DAGScheduler getShuffleMapStage
创建父Stage
val stage =newOrUsedStage(……
13. DAGScheduler newOrUsedStage
递归
val stage = newStage(rdd, numTasks, Some(shuffleDep), jobId, callSite)
14．DAGScheduler handleJobSubmitted
……
if (shouldRunLocally) {
// Compute very short actions like first() or take() with no parent stages locally.
//TODO 本地运行
listenerBus.post(
SparkListenerJobStart(job.jobId, jobSubmissionTime, Seq.empty, properties))
runLocally(job)
} else {
//TODO 集群模式
