暂时不想研究hadoop流先记下来

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原创最新推荐文章于 2026-03-15 00:29:31 发布 154 阅读 AI 写同款· GEO 优化 ›

暂时不想研究hadoop流先记下来

错误的：hadoop jar /home/hadoop/hadoopcdh/contrib/streaming/hadoop-streaming-0.20.2-cdh3u6.jar -input input -output output -mapper /bin/cat -reducer usr/bin/wc

正确的：hadoop jar /home/hadoop/hadoopcdh/contrib/streaming/hadoop-streaming-0.20.2-cdh3u6.jar -input input -output output3 -mapper cat -reducer wc

报错：

java.lang.RuntimeException: Error in configuring object
	at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93)
	at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
	at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
	at org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:432)
	at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:417)
	at org.apache.hadoop.mapred.Child$4.run(Child.java:266)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:396)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1278)
	at org.apache.hadoop.mapred.Child.main(Child.java:260)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcc

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