Re: Error Running Frequent Itemset Mining Example

[Jeff Eastman]

I also brought up a single instance at 
http://ec2-184-73-30-93.compute-1.amazonaws.com:50030/jobtracker.jsp and 
that ran fine too. It looks to me like the problem, whatever it is, is 
in your AMI or its configuration.

Jeff

On 5/18/10 5:15 PM, Jeff Eastman wrote:
Welll, I just brought up a 2 node cluster at 
http://ec2-174-129-148-227.compute-1.amazonaws.com:50030/jobtracker.jsp and 
it ran fine.


On 5/18/10 4:56 PM, Mike Roberts wrote:
Single instance.  Thx.

On Tue, May 18, 2010 at 4:49 PM, Jeff 
Eastman<j...@windwardsolutions.com>wrote:

Hi Mike,

Shouldn't happen. You running this on a single instance or on a hadoop
cluster? I will see if I can duplicate.

Jeff


On 5/18/10 4:27 PM, Mike Roberts wrote:

Hey Guys,

Just trying to get the example mentioned here working:
https://cwiki.apache.org/MAHOUT/parallelfrequentpatternmining.html.

I downloaded the accidents.dat file and placed it in
/home/ubuntu/mahout-in/fpm-input.
I created a directory for the output as 
/home/ubuntu/mahout-in/fpm-out.
Then, I ran the following command:
./bin/mahout fpg --input /home/ubuntu/mahout-in/fpm-input --output
/home/ubuntu/mahout-in/fpm-out --method mapreduce

It runs for a bit and after the first step I get the following error:

java.io.IOException: java.lang.ClassNotFoundException:
org.apache.mahout.common.Pair
         at

org.apache.hadoop.io.serializer.JavaSerialization$JavaSerializationDeserializer.deserialize(JavaSerialization.java:55) 

         at

org.apache.hadoop.io.serializer.JavaSerialization$JavaSerializationDeserializer.deserialize(JavaSerialization.java:36) 

         at

org.apache.hadoop.io.DefaultStringifier.fromString(DefaultStringifier.java:75) 

         at

org.apache.mahout.fpm.pfpgrowth.PFPGrowth.deserializeList(PFPGrowth.java:84) 

         at

org.apache.mahout.fpm.pfpgrowth.TransactionSortingMapper.setup(TransactionSortingMapper.java:77) 

         at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:142)
         at 
org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:621)
         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305)
         at
org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:177) 



The step that it was running:
10/05/18 23:10:18 INFO pfpgrowth.PFPGrowth: No of Features: 30
10/05/18 23:10:18 INFO jvm.JvmMetrics: Cannot initialize JVM 
Metrics with
processName=JobTracker, sessionId= - already initialized
10/05/18 23:10:18 WARN mapred.JobClient: Use GenericOptionsParser for
parsing the arguments. Applications should implement Tool for the 
same.
10/05/18 23:10:19 INFO input.FileInputFormat: Total input paths to 
process
:
1
10/05/18 23:10:19 INFO mapred.JobClient: Running job: job_local_0002
10/05/18 23:10:19 INFO input.FileInputFormat: Total input paths to 
process
:
1
10/05/18 23:10:19 INFO mapred.MapTask: io.sort.mb = 100
10/05/18 23:10:19 INFO mapred.MapTask: data buffer = 79691776/99614720
10/05/18 23:10:19 INFO mapred.MapTask: record buffer = 262144/327680
10/05/18 23:10:19 WARN mapred.LocalJobRunner: job_local_0002

Anyone know what's going on here, or have a solution?  I verified 
that the
class file (Pair.Java) exists in
/trunk/core/src/main/java/org/apache/mahout/common.  I did an mvn 
install
in
core just to be sure.  I'm running Hadoop 20.2 on Ubuntu 10.4 on EC2.
  BTW,
if it's not obvious, I'm a total Mahout n00b.

Thanks,

Mike