錯誤如下

Error: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class com.zhen.mr.RunJob$HotMapper not foundat 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 foundat org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:2060)at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2152)... 8 more

錯誤出現(xiàn)之前還有警告提示，如下

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

提示說沒有設(shè)置job jar

解決方法：

代碼中給job對象set一下

job.setJarByClass(RunJob.class);

然后再打包運行就ok了。

轉(zhuǎn)載于:https://www.cnblogs.com/EnzoDin/p/7302455.html

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