Hadoop安装错误

Question

我正在尝试通过查看here 在 Fedora 机器上安装 Hadoop

1. 已安装java（并通过java -version验证java是否存在）并且存在
2. 我安装了 ssh（因为它是 linux）
3. 从here下载最新版本hadoop 1.0.4

我已经按照安装教程（上面给出的链接）中显示的过程如下

$ mkdir input 
$ cp conf/*.xml input 
$ bin/hadoop jar hadoop-examples.1.0.4.jar grep input output 'dfs[a-z.]+' 

然后我得到了以下错误，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)

谁能告诉我我的机器/或代码有什么问题，如何避免这个错误？

Answer 1

首先，ssh 预装并不意味着它已经配置好了。您需要 ssh 和 sshd 以及密钥对。它应该是无密码的，“最好”。只需确保您能够 ssh 托管而不会出现任何错误。此外，请确保所有 hadoop 守护程序都运行良好。如果我们可以看看您的错误会更好日志。我已经编写了配置 hadoop here 的完整过程，以防您需要任何帮助。

Answer 2

这可能与 JVM 有关，并且在 Hadoop（某些版本）中存在有关文件权限的已知问题.. 所以检查这个链接：

       https://issues.apache.org/jira/browse/HADOOP-7682

希望对你有帮助