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  • Hadoop 运行jar包时 java.lang.ClassNotFoundException: Class com.zhen.mr.RunJob$HotMapper not found

    错误如下

    Error: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class com.zhen.mr.RunJob$HotMapper not found
        at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2154)
        at org.apache.hadoop.mapreduce.task.JobContextImpl.getMapperClass(JobContextImpl.java:186)
        at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:742)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
        at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:163)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1692)
        at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
    Caused by: java.lang.ClassNotFoundException: Class com.zhen.mr.RunJob$HotMapper not found
        at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:2060)
        at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2152)
        ... 8 more

    错误出现之前还有警告提示,如下

     WARN mapreduce.JobResourceUploader: No job jar file set.  User classes may not be found. See Job or Job#setJar(String).

    提示说没有设置job jar

    解决方法:

    代码中给job对象set一下

    job.setJarByClass(RunJob.class);

    然后再打包运行就ok了。

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  • 原文地址:https://www.cnblogs.com/EnzoDin/p/7302455.html
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