我试图通过在此处查看Fedora机器在Fedora机器上安装Hadoop
- 已安装Java（并验证Java是否存在
java -version），并且它存在 - 我已经安装了SSH（因为它是Linux）
- 从此处下载了最新版本
hadoop 1.0.4
我遵循以下安装教程（上面给出的链接）中显示的过程
$ mkdir input
$ cp conf/*.xml input
$ bin/hadoop jar hadoop-examples.1.0.4.jar grep input output 'dfs[a-z.]+'
然后我有以下错误，我无法理解
sh-4.2$ bin/hadoop jar hadoop-examples-1.0.4.jar grep input output 'dfs[a-z.]+'
12/10/31 16:14:35 INFO util.NativeCodeLoader: Loaded the native-hadoop library
12/10/31 16:14:35 WARN snappy.LoadSnappy: Snappy native library not loaded
12/10/31 16:14:35 INFO mapred.FileInputFormat: Total input paths to process : 8
12/10/31 16:14:35 INFO mapred.JobClient: Cleaning up the staging area file:/tmp/hadoop-thomas/mapred/staging/shivakrishnab-857393825/.staging/job_local_0001
12/10/31 16:14:35 ERROR security.UserGroupInformation: PriviledgedActionException as:thomas cause:java.io.IOException: Not a file: file:/home/local/thomas/Hadoop/hadoop-1.0.4/input/conf
java.io.IOException: Not a file: file:/home/local/thomas/Hadoop/hadoop-1.0.4/input/conf
at org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:215)
at org.apache.hadoop.mapred.JobClient.writeOldSplits(JobClient.java:989)
at org.apache.hadoop.mapred.JobClient.writeSplits(JobClient.java:981)
at org.apache.hadoop.mapred.JobClient.access$600(JobClient.java:174)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:897)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:850)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:416)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:850)
at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:824)
at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1261)
at org.apache.hadoop.examples.Grep.run(Grep.java:69)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.examples.Grep.main(Grep.java:93)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:64)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
任何人都可以让我知道我的机器/或代码怎么了，该怎么办才能避免此错误？
首先，ssh预安装并不意味着它已配置。您需要SSH和SSHD以及Keypair。它应该是无密码的，"最好是"。请确保您能够在没有任何错误的情况下托管SSH。此外，请确保所有的Hadoop Daemons运行正常，如果我们可以查看您的错误，那会更好日志。如果您需要任何帮助，我已经编写了完整的程序来配置Hadoop。
这可能与JVM有关，并且在Hadoop（某些版本）中有关文件许可的已知问题。因此，请检查此链接：
https://issues.apache.org/jira/browse/HADOOP-7682
希望这有帮助