Hadoop输入路径不存在

Question

我正在尝试在我的笔记本电脑上设置Hadoop。 我已经遵循了一些关于设置hadoop的教程。

我运行了这个命令：

bin/hdfs dfs -mkdir /user/<username>  

如果我再次运行它，它说已经存在。

我尝试使用以下命令运行测试 jar 文件：

bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.1.jar grep input output 'dfs[a-z.]+'

并接收此异常

16/01/22 15:11:06 INFO mapreduce.JobSubmitter: Cleaning up the staging area /tmp/hadoop-yarn/staging/<username>/.staging/job_1453492366595_0006 org.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input path does not exist: hdfs://localhost:9000/user/<username>/grep-temp-891167560

在此错误之前，我没有意识到我收到了这个：

16/01/22 15:51:50 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
16/01/22 15:51:51 INFO client.RMProxy: Connecting to ResourceManager at /0.0.0.0:8032
16/01/22 15:51:51 INFO input.FileInputFormat: Total input paths to process : 33
16/01/22 15:51:52 INFO mapreduce.JobSubmitter: number of splits:33
16/01/22 15:51:52 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1453492366595_0009
16/01/22 15:51:52 INFO impl.YarnClientImpl: Submitted application application_1453492366595_0009
16/01/22 15:51:52 INFO mapreduce.Job: The url to track the job: http://Marys-MacBook-Pro.local:8088/proxy/application_1453492366595_0009/
16/01/22 15:51:52 INFO mapreduce.Job: Running job: job_1453492366595_0009
16/01/22 15:51:56 INFO mapreduce.Job: Job job_1453492366595_0009 running in uber mode : false
16/01/22 15:51:56 INFO mapreduce.Job:  map 0% reduce 0%
16/01/22 15:51:56 INFO mapreduce.Job: Job job_1453492366595_0009 failed with state FAILED due to: Application application_1453492366595_0009 failed 2 times due to AM Container for appattempt_1453492366595_0009_000002 exited with  exitCode: 127
For more detailed output, check application tracking page:http://Marys-MacBook-Pro.local:8088/cluster/app/application_1453492366595_0009Then, click on links to logs of each attempt.
Diagnostics: Exception from container-launch.
Container id: container_1453492366595_0009_02_000001
Exit code: 127
Stack trace: ExitCodeException exitCode=127: 
    at org.apache.hadoop.util.Shell.runCommand(Shell.java:545)
    at org.apache.hadoop.util.Shell.run(Shell.java:456)
    at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:722)
    at org.apache.hadoop.yarn.server.nodemanager.DefaultContainerExecutor.launchContainer(DefaultContainerExecutor.java:211)
    at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLaunch.java:302)
    at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLaunch.java:82)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

Container exited with a non-zero exit code 127
Failing this attempt. Failing the application.

有一个

堆栈跟踪，如下所示。我在一台 Mac PC 上。

Answer 1

我使用Hadoop 2.7.2，并且在遵循官方文档时，我一开始也遇到了这个问题。

原因是我忘了遵循"准备启动Hadoop集群"一章。

我通过在etc/hadoop/hadoop-env.sh中设置JAVA_HOME来解决它。

Answer 2

对我来说，这是因为在hadoop中使用了错误的JDK版本。我使用了hadoop 2.6.5。起初，我使用 oracle JDK 1.8.0_131 启动 hadoop，运行示例 jar 并发生错误。在我使用 JDK 1.7.0_80 之后，该示例就像一个魅力。

有一个关于HadoopJavaVersions的页面。