想yarn上提交任务，报错：

18/12/14 17:48:56 INFO mapreduce.Job: Job job_1544766080243_0018 failed with state FAILED due to: Application a18_000002 exited with  exitCode: 127For more detailed output, check application tracking page:http://dev-hadoop6:8088/cluster/app/application_15447Diagnostics: Exception from container-launch.Container id: container_1544766080243_0018_02_000001Exit code: 127Stack trace: ExitCodeException exitCode=127:        at org.apache.hadoop.util.Shell.runCommand(Shell.java:585)        at org.apache.hadoop.util.Shell.run(Shell.java:482)        at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:776)        at org.apache.hadoop.yarn.server.nodemanager.DefaultContainerExecutor.launchContainer(DefaultContainerE        at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLa        at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLa        at java.util.concurrent.FutureTask.run(FutureTask.java:266)        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)        at java.lang.Thread.run(Thread.java:748)Container exited with a non-zero exit code 127Failing this attempt. Failing the application.18/12/14 17:48:56 INFO mapreduce.Job: Counters: 018/12/14 17:48:56 WARN mapreduce.HdfsMapReduce: Path /mapred-temp/job-user-analysis-statistic/01/top_in is notjava.io.IOException: Set input path failed !        at com.tracker.offline.common.mapreduce.HdfsMapReduce.setInputPath(HdfsMapReduce.java:165)        at com.tracker.offline.common.mapreduce.HdfsMapReduce.buildJob(HdfsMapReduce.java:122)        at com.tracker.offline.common.mapreduce.HdfsMapReduce.waitForCompletion(HdfsMapReduce.java:65)        at com.tracker.offline.business.job.user.JobAnalysisStatisticMR.main(JobAnalysisStatisticMR.java:88)        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)        at java.lang.reflect.Method.invoke(Method.java:498)        at org.apache.hadoop.util.RunJar.run(RunJar.java:221)        at org.apache.hadoop.util.RunJar.main(RunJar.java:136)

查看报错信息：yarn logs -applicationId application_1544766080243_0018

18/12/14 17:59:57 INFO client.RMProxy: Connecting to ResourceManager at dev-hadoop6/10.100.3.176:8032Container: container_1544766080243_0018_01_000001 on dev-hadoop5_43772========================================================================LogType:stderrLog Upload Time:星期五 十二月 14 17:48:56 +0800 2018LogLength:50Log Contents:/bin/bash: /bin/java: 没有那个文件或目录End of LogType:stderrLogType:stdoutLog Upload Time:星期五 十二月 14 17:48:56 +0800 2018LogLength:0Log Contents:End of LogType:stdout

这个是java找不到，修改yarn-env.sh

export JAVA_HOME=/home/jdk8

重新启动。

我们以第一句去网络上搜索相关答案，发现搜到的无外乎以下几种解决方案： 

1，更改hadoop-env.sh中的java_home环境变量

2，更改yarn-site.xml中的yarn.application.classpath之类的classpath

3，添加mac中java软连接