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我是 hadoop 的新手，正在尝试运行我的第一个程序。IDE 是 eclipse 和 hadoop 版本 0.20.2。找不到地图类。我收到以下错误....

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

您可以在这里查看我的文件。我真的被困在这里了。谁能告诉这里有什么问题？

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1 回答 1

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您是否尝试从 Eclipse 运行 MapReduce 作业？尝试使用$HADOOP_HOME/bin/hadoop jar <your compiled file>.jar.

于 2013-03-19T08:35:47.303 回答