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Re: Logistic regression package on Hadoop - MapReduce - [mail # user]
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...Hi Rajesh, You may want to use the mahout mailing list for mahout related question. http://mahout.apache.org/mailinglists.html Regards Bertrand On Mon, Oct 15, 2012 a...
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Author: Bertrand Dechoux,
2012-10-15, 12:53
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Re: setOutputValueClass(*.class) method - MapReduce - [mail # user]
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...Hi Andy, It should be called within the setup of your job and it should NOT be called within the Mapper. You could compile the call within the mapper of course. At best it should do no...
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Author: Bertrand Dechoux,
2012-10-11, 18:12
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Re: Collecting error messages from Mappers - MapReduce - [mail # user]
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...If it is only to get a parse overview of the run you can use counters. But you shouldn't overuse them. You can for example count exceptions by type (but by message is not a good approach unl...
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Author: Bertrand Dechoux,
2012-10-08, 14:32
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Re: Chaning Multiple Reducers: Reduce -> Reduce -> Reduce - MapReduce - [mail # user]
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...The question is not how to sequence all. Cascading could indeed help in that case. But how to skip the map phase and do the split/local sort directly at the end of the reduce so that t...
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Author: Bertrand Dechoux,
2012-10-08, 10:51
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Re: Chaning Multiple Reducers: Reduce -> Reduce -> Reduce - MapReduce - [mail # user]
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...Have you looked at graph processing for Hadoop? Like Hama ( http://hama.apache.org/) or Giraph (http://incubator.apache.org/giraph/). I can't say for sure it would help you but it seems to b...
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Author: Bertrand Dechoux,
2012-10-08, 10:39
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Re: What is the difference between Rack-local map tasks and Data-local map tasks? - MapReduce - [mail # user]
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...@Harsh : I didn't know. That's good to hear. I will check out the mapred.fairscheduler.locality.delay in FairScheduler. And I will also look at YARN-80 for my personal information. Tha...
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Author: Bertrand Dechoux,
2012-10-08, 05:44
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Re: What is the difference between Rack-local map tasks and Data-local map tasks? - MapReduce - [mail # user]
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...Basically, more replicas. The second solution would be to use a 'smarter' scheduler. In theory, the jobtracker should be able to say "postpone this task until a data-local task can be ...
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Author: Bertrand Dechoux,
2012-10-07, 19:31
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Job jar not removed from staging directory on job failure/how to share a job jar using distributed cache - MapReduce - [mail # user]
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...Hi, I am launching my job using the command line and I observed that when the provided input path do not match any files, the jar in the staging repository is not removed. It is remove...
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Author: Bertrand Dechoux,
2012-10-05, 16:58
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Re: Impersonating HDFS user - MapReduce - [mail # user]
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...Indeed, you are connecting to localhost and you said it was a remote connection so I guess there is nothing there which is relevant for you. The main idea is that you need to provide the con...
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Author: Bertrand Dechoux,
2012-10-05, 14:33
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Re: Impersonating HDFS user - MapReduce - [mail # user]
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...Hi, You might be looking for something like : UserGroupInformation.createRemoteUser(user).doAs( see http://hadoop.apache.org/docs/r1.0.3/api/org/apache/hadoop/security/UserGroupI...
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Author: Bertrand Dechoux,
2012-10-05, 13:34
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