Hadoop MapReduce NoSuchElementException

Question

我想在具有兩個節點的FreeBSD-Cluster上運行MapReduce-Job，但是出現以下異常

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)
...

當我嘗試運行job.watForCompletion(true);時，會發生這種情況job.watForCompletion(true); 在一個新的MapReduce作業上。 應該拋出NoSuchElementException，因為在那里沒有再調用StringTokenizer和next（）中的任何元素。 我查看了源代碼，並在RawLocalFileSystem.java中找到以下代碼部分：

/// 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();

據我所知，Hadoop嘗試使用ls -ld查找特定文件的某些權限，如果我在控制台中使用它，它可以完美地工作。 不幸的是，我還沒有找到它正在尋找的文件權限。

Hadoop版本為2.4.1，HBase版本為0.98.4，我正在使用Java-API。 其他操作（如創建表）也可以正常工作。 有沒有人遇到過類似的問題或知道該怎么辦？

編輯：我剛剛發現這是一個hadoop相關的問題。 即使不使用HDFS進行最簡單的MapReduce-Operation也給我同樣的例外。

Answer 1

您能檢查一下是否可以解決您的問題。

如果您的權限問題，則可以使用。

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);
                 .
                 .