spark运行时异常:org.apache.spark.SparkException: Could not find CoarseGrainedScheduler.
org.apache.spark.SparkException:CouldnotfindCoarseGrainedScheduler.atorg.apache.spark.rpc.netty.Dispatcher.postMessage(Dispatcher.scala:154)atorg.apache.spark.rpc.netty.Dispatcher.postOneWayMessage(Di