Java Hadoop MapReduce NoTouchElementException

我想在有两个节点的FreeBSD集群上运行MapReduce作业，但出现以下异常

14/08/27 14:23:04 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
14/08/27 14:23:04 INFO Configuration.deprecation: session.id is deprecated. Instead, use dfs.metrics.session-id
14/08/27 14:23:04 INFO jvm.JvmMetrics: Initializing JVM Metrics with processName=JobTracker, sessionId=
14/08/27 14:23:04 WARN mapreduce.JobSubmitter: Hadoop command-line option parsing not performed. Implement the Tool interface and execute your application with ToolRunner to remedy this.
14/08/27 14:23:04 WARN mapreduce.JobSubmitter: No job jar file set.  User classes may not be found. See Job or Job#setJar(String).
14/08/27 14:23:04 INFO mapreduce.JobSubmitter: Cleaning up the staging area file:/tmp/hadoop-otlam/mapred/staging/otlam968414084/.staging/job_local968414084_0001
Exception in thread "main" java.util.NoSuchElementException
at java.util.StringTokenizer.nextToken(StringTokenizer.java:349)
at org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.loadPermissionInfo(RawLocalFileSystem.java:565)
at org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.getPermission(RawLocalFileSystem.java:534)
at org.apache.hadoop.mapreduce.filecache.ClientDistributedCacheManager.checkPermissionOfOther(ClientDistributedCacheManager.java:276)
at org.apache.hadoop.mapreduce.filecache.ClientDistributedCacheManager.isPublic(ClientDistributedCacheManager.java:240)
at org.apache.hadoop.mapreduce.filecache.ClientDistributedCacheManager.determineCacheVisibilities(ClientDistributedCacheManager.java:162)
at org.apache.hadoop.mapreduce.filecache.ClientDistributedCacheManager.determineTimestampsAndCacheVisibilities(ClientDistributedCacheManager.java:58)
at org.apache.hadoop.mapreduce.JobSubmitter.copyAndConfigureFiles(JobSubmitter.java:265)
at org.apache.hadoop.mapreduce.JobSubmitter.copyAndConfigureFiles(JobSubmitter.java:301)
at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:389)
at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1285)
at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1282)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1556)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:1282)
at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1303)
...

当我尝试运行job.watForCompletiontrue时会发生这种情况；在新的MapReduce作业中。应该抛出NoSuchElementException，因为StringTokenizer和next中没有更多元素被调用。 我查看了源代码，在RawLocalFileSystem.java中发现了以下代码部分：

/// loads permissions, owner, and group from `ls -ld`
private void loadPermissionInfo() {
  IOException e = null;
  try {
    String output = FileUtil.execCommand(new File(getPath().toUri()), 
        Shell.getGetPermissionCommand());
    StringTokenizer t =
        new StringTokenizer(output, Shell.TOKEN_SEPARATOR_REGEX);
    //expected format
    //-rw-------    1 username groupname ...
    String permission = t.nextToken();

据我所知，Hadoop试图通过ls-ld查找特定文件的一些权限，如果我在控制台中使用它，这将非常有效。不幸的是，我还没有发现它在寻找哪些文件权限

Hadoop版本是2.4.1，HBase版本是0.98.4，我使用的是Java API。其他操作（如创建表）也可以正常工作。有没有人遇到过类似的问题或知道该怎么办

编辑：

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我刚刚发现这只是一个与hadoop相关的问题。即使不使用HDFS，进行最简单的MapReduce操作也会产生相同的异常。

请检查这是否可以解决您的问题

如果你的问题是权限问题，那么这是有效的

public static void main(String[] args) {
     //set user group information       
     UserGroupInformation ugi = UserGroupInformation.createRemoteUser("hdfs");
     //set privilege exception
     ugi.doAs(new PrivilegedExceptionAction<Void>() {
     public Void run() throws Exception {
                //create configuration object
                 Configuration config = new Configuration();
                 config.set("fs.defaultFS", "hdfs://ip:port/");
                 config.set("hadoop.job.ugi", "hdfs");
                 FileSystem dfs = FileSystem.get(config);
                 .
                 .

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谢谢你的回答。我已经解决了这个问题：事实证明，我使用了错误的依赖项，所以我开始使用maven进行依赖项管理，现在一切正常。