Stack trace: ExitCodeException exitCode=1:

执行~/hadoop-2.6.1/bin/hadoop distcp hdfs://master:8020/hbase   hdfs://master:8020/backup1 时遇到一个问题：

15/12/27 22:40:29 INFO mapreduce.Job:  map 0% reduce 0%
15/12/27 22:40:29 INFO mapreduce.Job: Job job_1451283482913_0002 failed with state FAILED due to: Application application_1451283482913_0002 failed 2 times due to AM Container for appattempt_1451283482913_0002_000002 exited with  exitCode: 1
For more detailed output, check application tracking page: click on links to logs of each attempt.
Diagnostics: Exception from container-launch.
Container id: container_1451283482913_0002_02_000001
Exit code: 1
Stack trace: ExitCodeException exitCode=1: 
        at org.apache.hadoop.util.Shell.runCommand(Shell.java:538)
        at org.apache.hadoop.util.Shell.run(Shell.java:455)
        at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:715)
        at org.apache.hadoop.yarn.server.nodemanager.DefaultContainerExecutor.launchContainer(DefaultContainerExecutor.java:211)
        at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLaunch.java:302)
        at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLaunch.java:82)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)

Container exited with a non-zero exit code 1
Failing this attempt. Failing the application.
15/12/27 22:40:29 INFO mapreduce.Job: Counters: 0
15/12/27 22:40:29 ERROR tools.DistCp: Exception encountered 
java.io.IOException: DistCp failure: Job job_1451283482913_0002 has failed: Application application_1451283482913_0002 failed 2 times due to AM Container for appattempt_1451283482913_0002_000002 exited with  exitCode: 1
For more detailed output, check application tracking page: click on links to logs of each attempt.
Diagnostics: Exception from container-launch.
Container id: container_1451283482913_0002_02_000001
Exit code: 1
是没有在/home/hadoop/hadoop-2.6.1/etc/hadoop/yarn-site.xml 中设置yarn.application.classpath所致，我添加如下即可：

  

<property>
  <name>yarn.application.classpath</name>
      <value>
           /home/hadoop/hadoop-2.6.1/etc/*,
           /home/hadoop/hadoop-2.6.1/etc/hadoop/*,
           /home/hadoop/hadoop-2.6.1/lib/*,
           /home/hadoop/hadoop-2.6.1/share/hadoop/common/*,
           /home/hadoop/hadoop-2.6.1/share/hadoop/common/lib/*,
           /home/hadoop/hadoop-2.6.1/share/hadoop/mapreduce/*,
           /home/hadoop/hadoop-2.6.1/share/hadoop/mapreduce/lib/*,
           /home/hadoop/hadoop-2.6.1/share/hadoop/hdfs/*,
           /home/hadoop/hadoop-2.6.1/share/hadoop/hdfs/lib/*,
           /home/hadoop/hadoop-2.6.1/share/hadoop/yarn/*,
           /home/hadoop/hadoop-2.6.1/share/hadoop/yarn/lib/*
      </value>
</property>

##留为笔记！