Hadoop地圖任務失敗

Question

我是hadoop的新手，並試圖運行我的第一個程序。 IDE是eclipse和hadoop版本0.20.2。沒有找到地圖類。我得到以下錯誤....

13/03/19 00:05:14 WARN mapred.JobClient: Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same.<br/> 
13/03/19 00:05:14 WARN mapred.JobClient: No job jar file set. User classes may not be found. See JobConf(Class) or JobConf#setJar(String).<br/> 
13/03/19 00:05:14 INFO input.FileInputFormat: Total input paths to process : 1<br/> 
13/03/19 00:05:16 INFO mapred.JobClient: Running job: job_201303182346_0003<br/> 
13/03/19 00:05:17 INFO mapred.JobClient: map 0% reduce 0%<br/> 
13/03/19 00:05:29 INFO mapred.JobClient: Task Id : attempt_201303182346_0003_m_000000_0, Status : FAILED 

java.lang.RuntimeException: java.lang.ClassNotFoundException: gsMapred.MapTaskone 
    at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:809) 
    at org.apache.hadoop.mapreduce.JobContext.getMapperClass(JobContext.java:157) 
    at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:569) 
    at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305) 
    at org.apache.hadoop.mapred.Child.main(Child.java:170) 
Caused by: java.lang.ClassNotFoundException: gsMapred.MapTaskone 
    at java.net.URLClassLoader$1.run(URLClassLoader.java:217) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.net.URLClassLoader.findClass(URLClassLoader.java:205) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:321) 
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:266) 
    at java.lang.Class.forName0(Native Method) 
    at java.lang.Class.forName(Class.java:264) 
    at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:762) 
    at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:807) 
    ... 4 more 

你可以看看我的文件here。我真的被困在這裏。誰能說出這裏有什麼問題？

Answer 1

您是否嘗試從Eclipse運行MapReduce作業？嘗試使用$HADOOP_HOME/bin/hadoop jar <your compiled file>.jar運行編譯的JAR。