【发布时间】：2015-03-19 14:21:48
【问题描述】：
我正在尝试运行随机森林示例。我运行的命令是
hadoop jar mahout-examples-0.9-job.jar org.apache.mahout.classifier.df.mapreduce.BuildForest -Dmapred.max.split.size=1874231 -d testdata/KDDTrain+.arff -ds testdata/KDDTrain.info -sl 5 -p -t 100 -o nsl-forest
我收到了这个错误：
Exception in thread "main" java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.JobContext, but class was expected
at org.apache.mahout.classifier.df.mapreduce.partial.PartialBuilder.processOutput(PartialBuilder.java:113)
at org.apache.mahout.classifier.df.mapreduce.partial.PartialBuilder.parseOutput(PartialBuilder.java:89)
at org.apache.mahout.classifier.df.mapreduce.Builder.build(Builder.java:294)
at org.apache.mahout.classifier.df.mapreduce.BuildForest.buildForest(BuildForest.java:228)
at org.apache.mahout.classifier.df.mapreduce.BuildForest.run(BuildForest.java:188)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.mahout.classifier.df.mapreduce.BuildForest.main(BuildForest.java:252)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
我使用 Mahout 0.9 和 Hadoop 2.6.0
我需要做什么来解决这个问题？
【问题讨论】：