Space: Apache Mahout (https://cwiki.apache.org/confluence/display/MAHOUT)
Page: Quick tour of text analysis using the Mahout command line
(https://cwiki.apache.org/confluence/display/MAHOUT/Quick+tour+of+text+analysis+using+the+Mahout+command+line)
Comment:
https://cwiki.apache.org/confluence/display/MAHOUT/Quick+tour+of+text+analysis+using+the+Mahout+command+line?focusedCommentId=27843858#comment-27843858
Comment added by yexq:
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[hadoop@RH01 classes]$ hadoop fs -ls reuters-vectors/tfidf-vectors/part-r-00000
Found 1 items
-rw-r--r-- 2 hadoop supergroup 15551368 2012-04-10 16:47
/user/hadoop/reuters-vectors/tfidf-vectors/part-r-00000
[hadoop@RH01 classes]$ mahout rowid -i
reuters-vectors/tfidf-vectors/part-r-00000 -o reuters-matrix
Running on hadoop, using HADOOP_HOME=/mnt/userspace/hadoop-0.20.2
HADOOP_CONF_DIR=/mnt/userspace/hadoop-0.20.2/conf
Exception in thread "main" java.lang.IllegalArgumentException: Can not create a
Path from a null string
at org.apache.hadoop.fs.Path.checkPathArg(Path.java:78)
at org.apache.hadoop.fs.Path.<init>(Path.java:90)
at org.apache.mahout.utils.vectors.RowIdJob.run(RowIdJob.java:42)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
at org.apache.mahout.utils.vectors.RowIdJob.main(RowIdJob.java:76)
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.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:187)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
[hadoop@RH01 classes]$
who can help me？？？？
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