我是emr新手，每次运行作业时，系统日志中都会出现以下错误： 2014-05-27 03:59:57,220 INFO org.apache.hadoop.mapreduce.Job (main): Job job_1401143947501_0009 failed with state FAILED due to: Application application_1401143947501_0009 failed 2 times due to AM Container for appattempt_1401143947501_0009_000002 exited with exitCode: 1 due to: Exception from container-launch: org.apache.hadoop.util.Shell$ExitCodeException: at org.apache.hadoop.util.Shell.runCommand(Shell.java:464) at org.apache.hadoop.util.Shell.run(Shell.java:379) at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:589) at org.apache.hadoop.yarn.server.nodemanager.DefaultContainerExecutor.launchContainer(DefaultContainerExecutor.java:195) at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLaunch.java:283) at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLaunch.java:79) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:744) 我不知道这意味着什么，我应该调查什么。我环顾了很多地方，似乎有很多不同的意见。一些人建议从yarn-site.xml中删除yarn.application.classpath和/或更改同一文件中的yarn.nodemanager.resource.memory-mb。但是，到目前为止还没有任何进展。我觉得我在黑暗中射击。如果有人能告诉我该找什么，那就真的很有帮助了。
提前谢谢