我尝试从at网站运行第一个示例http://hadoop.apache.org/docs/current2/hadoop-yarn/hadoop-yarn-site/writingyarnapplications.html
下面是我的密码

Path jarPath = new Path("target/HadoopStudy-0.0.1-SNAPSHOT.jar");
    FileSystem fs = FileSystem.get(conf);
    FileStatus jarStatus = fs.getFileStatus(jarPath);
    LocalResource amJarRsrc = Records.newRecord(LocalResource.class);

    amJarRsrc.setType(LocalResourceType.FILE);

    amJarRsrc.setVisibility(LocalResourceVisibility.APPLICATION);

    logger.debug(ConverterUtils.getYarnUrlFromPath(jarPath));
    amJarRsrc.setResource(ConverterUtils.getYarnUrlFromPath(jarPath));
    amJarRsrc.setTimestamp(jarStatus.getModificationTime());
    amJarRsrc.setSize(jarStatus.getLen());
    localResources.put(Common.LOCAL_JAR_PATH, amJarRsrc);
    amContainer.setLocalResources(localResources);

但是我可以得到申请id，并将申请提交给yarn，但是申请总是失败的，我在master上查看了NodeManager日志，发现了这些错误

java.net.URISyntaxException: Relative path in absolute URI: ://target/HadoopStudy-0.0.1-SNAPSHOT.jar
    at java.net.URI.checkPath(URI.java:1804)
    at java.net.URI.<init>(URI.java:752)
    at org.apache.hadoop.yarn.util.ConverterUtils.getPathFromYarnURL(ConverterUtils.java:77)
    at org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.LocalResourceRequest.<init>(LocalResourceRequest.java:46)
    at org.apache.hadoop.yarn.server.nodemanager.containermanager.container.ContainerImpl$RequestResourcesTransition.transition(ContainerImpl.java:523)
    at org.apache.hadoop.yarn.server.nodemanager.containermanager.container.ContainerImpl$RequestResourcesTransition.transition(ContainerImpl.java:494)
    at org.apache.hadoop.yarn.state.StateMachineFactory$MultipleInternalArc.doTransition(StateMachineFactory.java:385)
    at org.apache.hadoop.yarn.state.StateMachineFactory.doTransition(StateMachineFactory.java:302)
    at org.apache.hadoop.yarn.state.StateMachineFactory.access$300(StateMachineFactory.java:46)
    at org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:448)
    at org.apache.hadoop.yarn.server.nodemanager.containermanager.container.ContainerImpl.handle(ContainerImpl.java:850)
    at org.apache.hadoop.yarn.server.nodemanager.containermanager.container.ContainerImpl.handle(ContainerImpl.java:73)
    at org.apache.hadoop.yarn.server.nodemanager.containermanager.ContainerManagerImpl$ContainerEventDispatcher.handle(ContainerManagerImpl.java:681)
    at org.apache.hadoop.yarn.server.nodemanager.containermanager.ContainerManagerImpl$ContainerEventDispatcher.handle(ContainerManagerImpl.java:674)
    at org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:134)
    at org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:81)
    at java.lang.Thread.run(Thread.java:722)

我在pca上运行这个示例，但在pcb上部署hadoop。jar在电脑a上。
经过调查，我不能解决它。但我有一些问题。
1） 我需要上传jar到hdfs吗？如果我需要，我知道该怎么办
2） 我只是想了解一些Yarn的原理，如果我想提交申请，我需要上传jar给师傅吗？我能把jar文件上传到master的本地文件系统吗？如果可以，如何设置路径？