Spark On Yarn ERROR spark.SparkContext: Error initializing SparkContext.

当初搭建Spark On Yarn时候 配置yarn端获取spark运行的jar包时候，配置如下：

spark.yarn.jars           hdfs:///sparkrunjar/

提交程序：

spark-submit --class org.apache.spark.examples.SparkPi --master yarn --deploy-mode client /home/daxin/spark/examples/jars/spark-examples_2.11-2.0.1.jar  100

显示错误：

16/11/01 17:37:25 ERROR spark.SparkContext: Error initializing SparkContext.
org.apache.spark.SparkException: Yarn application has already ended! It might have been killed or unable to launch application master.
at org.apache.spark.scheduler.cluster.YarnClientSchedulerBackend.waitForApplication(YarnClientSchedulerBackend.scala:85)
at org.apache.spark.scheduler.cluster.YarnClientSchedulerBackend.start(YarnClientSchedulerBackend.scala:62)
at org.apache.spark.scheduler.TaskSchedulerImpl.start(TaskSchedulerImpl.scala:149)
at org.apache.spark.SparkContext.(SparkContext.scala:497)
at org.apache.spark.SparkContext$.getOrCreate(SparkContext.scala:2275)
at org.apache.spark.sql.SparkSession$Builder$$anonfun$8.apply(SparkSession.scala:831)
at org.apache.spark.sql.SparkSession$Builder$$anonfun$8.apply(SparkSession.scala:823)
at scala.Option.getOrElse(Option.scala:121)
at org.apache.spark.sql.SparkSession$Builder.getOrCreate(SparkSession.scala:823)
at org.apache.spark.examples.SparkPi$.main(SparkPi.scala:31)
at org.apache.spark.examples.SparkPi.main(SparkPi.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:736)
at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:185)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:210)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:124)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
16/11/01 17:37:25 INFO server.ServerConnector: Stopped ServerConnector@52b8e429{HTTP/1.1}{0.0.0.0:4040}

Hadoop集群错WebUI显示错误：Could not find or load main class org.apache.spark.deploy.yarn.ExecutorLauncher。

此时候定位错误应该是找不到saprk运行时jar导致的，但是：

hdfs dfs -ls  hdfs:///sparkrunjar/ 的确显示有jar包，一脸懵逼啊！！！

最后将spark.yarn.jars的配置修改          hdfs:///sparkrunjar/*  （后面加一个*解决问题）