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From Paritosh Ranjan <pran...@xebia.com>
Subject Re: KmeansDriver Question
Date Mon, 17 Sep 2012 07:59:32 GMT
AFAIK SequenceFileTokenizerMapper is not called from KMeansdriver.

The mapper is tokenizing sequence files, so, the error might be during 
that step.

On 17-09-2012 12:39, jung hoon sohn wrote:
> Thank you for the reply.
> However the error was thrown during the process of the map (
> org.apache.hadoop.mapreduce.**Mapper.run).
> Isn't the mapping function part of the KmeansDriver class?
>
> Thank You.
>
> Jung Hoon
>
> On Sat, Sep 15, 2012 at 5:48 PM, Paritosh Ranjan <pranjan@xebia.com> wrote:
>
>> I don't think that it is a kmeans driver error.
>> SequenceFileTokenizerMapper is not used in KmeansDriver. I think you are
>> getting error while transforming data.
>>
>>
>> On 15-09-2012 12:59, jung hoon sohn wrote:
>>
>>> Hello, I am trying to cluster the input data using KmeansDriver.
>>> The input vector is transformed from the lucene vector using the
>>> "bin/mahout lucene.vector ..." commands and when I run the
>>> KmeansDriver using the run method, I get
>>>
>>> 12/09/15 15:18:13 INFO mapred.JobClient: Task Id :
>>> attempt_201209121951_0067_m_**000000_1, Status : FAILED
>>> java.lang.ClassCastException: org.apache.hadoop.io.**LongWritable cannot
>>> be
>>> cast to org.apache.hadoop.io.Text
>>>           at
>>> org.apache.mahout.vectorizer.**document.**SequenceFileTokenizerMapper.**
>>> map(**SequenceFileTokenizerMapper.**java:37)
>>>           at org.apache.hadoop.mapreduce.**Mapper.run(Mapper.java:144)
>>>           at org.apache.hadoop.mapred.**MapTask.runNewMapper(MapTask.**
>>> java:764)
>>>           at org.apache.hadoop.mapred.**MapTask.run(MapTask.java:370)
>>>           at org.apache.hadoop.mapred.**Child$4.run(Child.java:255)
>>>           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:**1093)
>>>           at org.apache.hadoop.mapred.**Child.main(Child.java:249)
>>>
>>> for several attempts but the process goes on and generates the output
>>> data.
>>> I can even run the clusterdump using the output cluster data however I am
>>> concerned about the effect of above errors.
>>>
>>> Please help me to get through the problem.
>>>
>>> Thanks.
>>>
>>> Jung Hoon
>>>
>>>
>>



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