使用Hadoop 2.2.0使用Mahout 1.0-Snapshot时,SEQDirectory在MapReduce模式下抛出错误
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21-12-2019 - |
题
我正在尝试使用Hadoop 2.2.0的Mahout 1.0-Snapshot中的SEQDirectory命令。使用命令:
seqdirectory -i input -o output
.
堆栈跟踪:
Error: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at org.apache.hadoop.mapreduce.lib.input.CombineFileRecordReader.initNextRecordReader(CombineFileRecordReader.java:164)
at org.apache.hadoop.mapreduce.lib.input.CombineFileRecordReader.<init>(CombineFileRecordReader.java:126)
at org.apache.mahout.text.MultipleTextFileInputFormat.createRecordReader(MultipleTextFileInputFormat.java:43)
at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.<init>(MapTask.java:491)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:734)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:339)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:162)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:157)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at org.apache.hadoop.mapreduce.lib.input.CombineFileRecordReader.initNextRecordReader(CombineFileRecordReader.java:155)
... 10 more
Caused by: java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.TaskAttemptContext, but class was expected
at org.apache.mahout.text.WholeFileRecordReader.<init>(WholeFileRecordReader.java:59)
... 15 more
.
我认为这是mahout 0.9的问题,并在树干中固定。任何线索如何处理这个?我想在mapreduce模式下运行它,所以--xm顺序不是我正在寻找的答案。
解决方案
Caused by: java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.TaskAttemptContext, but class was expected
这样的错误总是意味着您正在运行一些与其编译的内容不同的东西的内容。在这里,您没有为Hadoop 2编译Mahout 2.它不是自然与Hadoop 2一起工作,没有一些构建变化。
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