spark 问题求教

spark 启动后 提交任务失败，问下各位大佬是什么问题呢。

脚本代码：
from pyspark import SparkContext,SparkConf
host = 'discomaster'
sc = SparkContext.getOrCreate(conf=SparkConf().setMaster('spark://%s:7077' %host).setAppName('lc_test'))

rdd = sc.parallelize(range(1,11),4)
res = rdd.take(100)
print res

脚本在 webserver2 上执行，discomaster 是 master 节点。

集群信息：
URL: spark://discomaster:7077
Alive Workers: 27
Cores in use: 27 Total, 0 Used
Memory in use: 54.0 GiB Total, 0.0 B Used
Resources in use:
Applications: 0 Running, 42 Completed
Drivers: 0 Running, 0 Completed
Status: ALIVE

脚本执行信息：
24/02/18 09:49:26 WARN TaskSchedulerImpl: Initial job has not accepted any resources; check your cluster UI to ensure that workers are registered and have sufficient resources
24/02/18 09:49:41 WARN TaskSchedulerImpl: Initial job has not accepted any resources; check your cluster UI to ensure that workers are registered and have sufficient resources
24/02/18 09:49:56 WARN TaskSchedulerImpl: Initial job has not accepted any resources; check your cluster UI to ensure that workers are registered and have sufficient resources
24/02/18 09:50:11 WARN TaskSchedulerImpl: Initial job has not accepted any resources; check your cluster UI to ensure that workers are registered and have sufficient resources
24/02/18 09:50:26 WARN TaskSchedulerImpl: Initial job has not accepted any resources; check your cluster UI to ensure that workers are registered and have sufficient resources

excutor 的 stderr 信息：
Spark Executor Command: "/usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java" "-cp" "/share/software/spark/conf/:/share/software/spark/jars/*" "-Xmx1024M" "-Dspark.driver.port=19038" "org.apache.spark.executor.CoarseGrainedExecutorBackend" "--driver-url" "spark://CoarseGrainedScheduler@webserver2:19038" "--executor-id" "372" "--hostname" "172.16.22.108" "--cores" "1" "--app-id" "app-20240218094855-0041" "--worker-url" "spark://[email protected]:36943"
========================================

Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
24/02/18 09:49:30 INFO CoarseGrainedExecutorBackend: Started daemon with process name: 123172@cluster208
24/02/18 09:49:30 INFO SignalUtils: Registered signal handler for TERM
24/02/18 09:49:30 INFO SignalUtils: Registered signal handler for HUP
24/02/18 09:49:30 INFO SignalUtils: Registered signal handler for INT
24/02/18 09:49:30 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
24/02/18 09:49:30 INFO SecurityManager: Changing view acls to: root,lichong
24/02/18 09:49:30 INFO SecurityManager: Changing modify acls to: root,lichong
24/02/18 09:49:30 INFO SecurityManager: Changing view acls groups to:
24/02/18 09:49:30 INFO SecurityManager: Changing modify acls groups to:
24/02/18 09:49:30 INFO SecurityManager: SecurityManager: authentication disabled; ui acls disabled; users with view permissions: Set(root, lichong); groups with view permissions: Set(); users with modify permissions: Set(root, lichong); groups with modify permissions: Set()
Exception in thread "main" java.lang.reflect.UndeclaredThrowableException
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1761)
at org.apache.spark.deploy.SparkHadoopUtil.runAsSparkUser(SparkHadoopUtil.scala:61)
at org.apache.spark.executor.CoarseGrainedExecutorBackend$.run(CoarseGrainedExecutorBackend.scala:283)
at org.apache.spark.executor.CoarseGrainedExecutorBackend$.main(CoarseGrainedExecutorBackend.scala:272)
at org.apache.spark.executor.CoarseGrainedExecutorBackend.main(CoarseGrainedExecutorBackend.scala)
Caused by: org.apache.spark.SparkException: Exception thrown in awaitResult:
at org.apache.spark.util.ThreadUtils$.awaitResult(ThreadUtils.scala:302)
at org.apache.spark.rpc.RpcTimeout.awaitResult(RpcTimeout.scala:75)
at org.apache.spark.rpc.RpcEnv.setupEndpointRefByURI(RpcEnv.scala:101)
at org.apache.spark.executor.CoarseGrainedExecutorBackend$.$anonfun$run$3(CoarseGrainedExecutorBackend.scala:303)
at scala.runtime.java8.JFunction1$mcVI$sp.apply(JFunction1$mcVI$sp.java:23)
at scala.collection.TraversableLike$WithFilter.$anonfun$foreach$1(TraversableLike.scala:877)
at scala.collection.immutable.Range.foreach(Range.scala:158)
at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:876)
at org.apache.spark.executor.CoarseGrainedExecutorBackend$.$anonfun$run$1(CoarseGrainedExecutorBackend.scala:301)
at org.apache.spark.deploy.SparkHadoopUtil$$anon$1.run(SparkHadoopUtil.scala:62)
at org.apache.spark.deploy.SparkHadoopUtil$$anon$1.run(SparkHadoopUtil.scala:61)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1746)
... 4 more
Caused by: java.io.IOException: Failed to connect to webserver2/172.16.16.175:19038
at org.apache.spark.network.client.TransportClientFactory.createClient(TransportClientFactory.java:253)
at org.apache.spark.network.client.TransportClientFactory.createClient(TransportClientFactory.java:195)
at org.apache.spark.rpc.netty.NettyRpcEnv.createClient(NettyRpcEnv.scala:204)
at org.apache.spark.rpc.netty.Outbox$$anon$1.call(Outbox.scala:202)
at org.apache.spark.rpc.netty.Outbox$$anon$1.call(Outbox.scala:198)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: webserver2/172.16.16.175:19038
Caused by: java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:330)
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:334)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:702)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:748)