我正在尝试将数据帧保存到cassandra，这会因错误的密码而导致错误。作业进入失败状态，在Spark UI中的“作业”选项卡中抛出以下异常，但在流式选项卡中，相应的批次将永远处于活动状态。在纱线客户端模式下，流式批处理不会失败..然而，同样在Yarn-cluster模式下工作正常，它会抛出相同的错误并结束应用程序。
为什么这两种模式的行为存在差异？为什么yarn-client模式会以这种方式运行？
两种模式都有例外情况：
即将保存到Cassandra。
16/08/04 08:04:43 ERROR org.apache.spark.streaming.scheduler.JobScheduler: Error running job streaming job 1470297880000 ms.0
java.io.IOException: Failed to open native connection to Cassandra at {172.x.x.x}:9042
at com.datastax.spark.connector.cql.CassandraConnector$.com$datastax$spark$connector$cql$CassandraConnector$$createSession(CassandraConnector.scala:162)
at com.datastax.spark.connector.cql.CassandraConnector$$anonfun$2.apply(CassandraConnector.scala:148)
at com.datastax.spark.connector.cql.CassandraConnector$$anonfun$2.apply(CassandraConnector.scala:148)
at com.datastax.spark.connector.cql.RefCountedCache.createNewValueAndKeys(RefCountedCache.scala:31)
at com.datastax.spark.connector.cql.RefCountedCache.acquire(RefCountedCache.scala:56)
at com.datastax.spark.connector.cql.CassandraConnector.openSession(CassandraConnector.scala:81)
at com.datastax.spark.connector.cql.CassandraConnector.withSessionDo(CassandraConnector.scala:109)
at com.datastax.spark.connector.rdd.partitioner.CassandraRDDPartitioner$.getTokenFactory(CassandraRDDPartitioner.scala:184)
at org.apache.spark.sql.cassandra.CassandraSourceRelation$.apply(CassandraSourceRelation.scala:267)
at org.apache.spark.sql.cassandra.DefaultSource.createRelation(DefaultSource.scala:84)
at org.apache.spark.sql.execution.datasources.ResolvedDataSource$.apply(ResolvedDataSource.scala:170)
at org.apache.spark.sql.DataFrameWriter.save(DataFrameWriter.scala:146)
at boccstreamingall$$anonfun$process_kv_text_stream$1.apply(bocc_spark_all.scala:249)
at boccstreamingall$$anonfun$process_kv_text_stream$1.apply(bocc_spark_all.scala:233)
at org.apache.spark.streaming.dstream.DStream$$anonfun$foreachRDD$1$$anonfun$apply$mcV$sp$3.apply(DStream.scala:631)
at org.apache.spark.streaming.dstream.DStream$$anonfun$foreachRDD$1$$anonfun$apply$mcV$sp$3.apply(DStream.scala:631)
at org.apache.spark.streaming.dstream.ForEachDStream$$anonfun$1$$anonfun$apply$mcV$sp$1.apply$mcV$sp(ForEachDStream.scala:42)
at org.apache.spark.streaming.dstream.ForEachDStream$$anonfun$1$$anonfun$apply$mcV$sp$1.apply(ForEachDStream.scala:40)
at org.apache.spark.streaming.dstream.ForEachDStream$$anonfun$1$$anonfun$apply$mcV$sp$1.apply(ForEachDStream.scala:40)
at org.apache.spark.streaming.dstream.DStream.createRDDWithLocalProperties(DStream.scala:399)
at org.apache.spark.streaming.dstream.ForEachDStream$$anonfun$1.apply$mcV$sp(ForEachDStream.scala:40)
at org.apache.spark.streaming.dstream.ForEachDStream$$anonfun$1.apply(ForEachDStream.scala:40)
at org.apache.spark.streaming.dstream.ForEachDStream$$anonfun$1.apply(ForEachDStream.scala:40)
at scala.util.Try$.apply(Try.scala:161)
at org.apache.spark.streaming.scheduler.Job.run(Job.scala:34)
at org.apache.spark.streaming.scheduler.JobScheduler$JobHandler$$anonfun$run$1.apply$mcV$sp(JobScheduler.scala:207)
at org.apache.spark.streaming.scheduler.JobScheduler$JobHandler$$anonfun$run$1.apply(JobScheduler.scala:207)
at org.apache.spark.streaming.scheduler.JobScheduler$JobHandler$$anonfun$run$1.apply(JobScheduler.scala:207)
at scala.util.DynamicVariable.withValue(DynamicVariable.scala:57)
at org.apache.spark.streaming.scheduler.JobScheduler$JobHandler.run(JobScheduler.scala:206)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: com.datastax.driver.core.exceptions.AuthenticationException: Authentication error on host /172.x.x.x:9042: Username and/or password are incorrect
at com.datastax.driver.core.Connection$8.apply(Connection.java:376)
at com.datastax.driver.core.Connection$8.apply(Connection.java:346)
at shadeio.common.util.concurrent.Futures$ChainingListenableFuture.run(Futures.java:861)
at shadeio.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:297)
at shadeio.common.util.concurrent.ExecutionList.executeListener(ExecutionList.java:156)
at shadeio.common.util.concurrent.ExecutionList.execute(ExecutionList.java:145)
at shadeio.common.util.concurrent.AbstractFuture.set(AbstractFuture.java:185)
at com.datastax.driver.core.Connection$Future.onSet(Connection.java:1174)
at com.datastax.driver.core.Connection$Dispatcher.channelRead0(Connection.java:1005)
at com.datastax.driver.core.Connection$Dispatcher.channelRead0(Connection.java:928)
at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:266)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:244)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1084)
at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:959)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:327)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:230)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:831)
at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:346)
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:254)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)