spark运行时异常：org.apache.spark.SparkException: Could not find CoarseGrainedScheduler.

org.apache.spark.SparkException: Could not find CoarseGrainedScheduler.
	at org.apache.spark.rpc.netty.Dispatcher.postMessage(Dispatcher.scala:154)
	at org.apache.spark.rpc.netty.Dispatcher.postOneWayMessage(Dispatcher.scala:134)
	at org.apache.spark.rpc.netty.NettyRpcEnv.send(NettyRpcEnv.scala:186)
	at org.apache.spark.rpc.netty.NettyRpcEndpointRef.send(NettyRpcEnv.scala:517)
	at org.apache.spark.scheduler.cluster.CoarseGrainedSchedulerBackend$DriverEndpoint$$anon$1$$anonfun$run$1$$anonfun$apply$mcV$sp$1.apply(CoarseGrainedSchedulerBackend.scala:116)
	at org.apache.spark.scheduler.cluster.CoarseGrainedSchedulerBackend$DriverEndpoint$$anon$1$$anonfun$run$1$$anonfun$apply$mcV$sp$1.apply(CoarseGrainedSchedulerBackend.scala:116)
	at scala.Option.foreach(Option.scala:257)
	at org.apache.spark.scheduler.cluster.CoarseGrainedSchedulerBackend$DriverEndpoint$$anon$1$$anonfun$run$1.apply$mcV$sp(CoarseGrainedSchedulerBackend.scala:116)
	at org.apache.spark.util.Utils$.tryLogNonFatalError(Utils.scala:1317)
	at org.apache.spark.scheduler.cluster.CoarseGrainedSchedulerBackend$DriverEndpoint$$anon$1.run(CoarseGrainedSchedulerBackend.scala:115)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

在spark配置文件/conf目录下的spark-env.sh中加入下面梁行代码即可（增大core和内存值）
export SPARK_WORKER_CORES=2
export SPARK_WORKER_MEMORY=2g