CODEWITHSUNDEEP
javamahout
Himanshu Yadav
Himanshu Yadav

Reputation: 13585

Mahout seqdirectory not working

I am trying work on "Mahout Cookbook"'s 2nd chapter recipe.
It's first step to sequencing some lastfm data.
mahout seqdirectory -i $WORK_DIR/original -o $WORK_DIR/sequencesfiles
This command supposed to convert original format to Mahout's sequence format.

14/07/23 14:43:10 INFO mapred.LocalJobRunner: map task executor complete.
14/07/23 14:43:10 WARN mapred.LocalJobRunner: job_local1595213196_0001
java.lang.Exception: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
    at org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462)
    at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:522)
Caused by: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
    at org.apache.hadoop.mapreduce.lib.input.CombineFileRecordReader.initNextRecordReader(CombineFileRecordReader.java:166)
    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$NewTrackingRecordReader.<init>(MapTask.java:492)
    at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:735)
    at org.apache.hadoop.mapred.MapTask.run(MapTask.java:340)
    at org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:243)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
    at org.apache.hadoop.mapreduce.lib.input.CombineFileRecordReader.initNextRecordReader(CombineFileRecordReader.java:157)
    ... 11 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)

Upvotes: 0

Views: 492

Answers (1)

tuxdna
tuxdna

Reputation: 8487

Check this error:

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)

This means, your version version of Hadoop is different than what is expected by Mahout.

Hadoop: java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.JobContext, but class was expected

Check your installation once.

Upvotes: 1

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