Hadoop 運行jar包時 java.lang.ClassNotFoundException: Class com.zhen.mr.RunJob$HotMapper not found
阿新 • • 發佈:2017-08-08
yar error not caused not found mapred info group col
錯誤如下
Error: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class com.zhen.mr.RunJob$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
錯誤出現之前還有警告提示,如下
WARN mapreduce.JobResourceUploader: No job jar file set. User classes may not be found. See Job or Job#setJar(String).
提示說沒有設置job jar
解決方法:
代碼中給job對象set一下
job.setJarByClass(RunJob.class);
然後再打包運行就ok了。
Hadoop 運行jar包時 java.lang.ClassNotFoundException: Class com.zhen.mr.RunJob$HotMapper not found