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Re: setOutputValueClass(*.class) method - MapReduce - [mail # user]
...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...
   Author: Bertrand Dechoux, 2012-10-11, 18:12
Re: Collecting error messages from Mappers - MapReduce - [mail # user]
...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...
   Author: Bertrand Dechoux, 2012-10-08, 14:32
Re: Chaning Multiple Reducers: Reduce -> Reduce -> Reduce - MapReduce - [mail # user]
...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...
   Author: Bertrand Dechoux, 2012-10-08, 10:51
Re: What is the difference between Rack-local map tasks and Data-local map tasks? - MapReduce - [mail # user]
...@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...
   Author: Bertrand Dechoux, 2012-10-08, 05:44
Job jar not removed from staging directory on job failure/how to share a job jar using distributed cache - MapReduce - [mail # user]
...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...
   Author: Bertrand Dechoux, 2012-10-05, 16:58
Re: Impersonating HDFS user - MapReduce - [mail # user]
...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...
   Author: Bertrand Dechoux, 2012-10-05, 14:33
Re: Multiple Aggregate functions in map reduce program - MapReduce - [mail # user]
...I guess one important question is what do you mean by 'it takes time'. And what goal do you want to reach. It may be that your current implementation is naive and can be improved (which begs...
   Author: Bertrand Dechoux, 2012-10-05, 08:13
Re: Cumulative value using mapreduce - MapReduce - [mail # user]
...Hi,  The provided example records are perfect. With that I doubt there will be any confusion about what kind of data is available and it should be manipulated. However, "the output is n...
   Author: Bertrand Dechoux, 2012-10-05, 06:38
Re: What's the basic idea of pseudo-distributed Hadoop ? - MapReduce - [mail # user]
...The only difference between pseudo-distributed and fully distributed would be scale. You could say that code that runs fine on the former, runs fine too on the latter. But it does not necess...
   Author: Bertrand Dechoux, 2012-09-14, 07:31
Re: Configuration of hadoop.job.history.user.location on a user basis - MapReduce - [mail # user]
...Hi Hemanth,  I thought of that but I didn't test it because I need the same for the job id. Of course, I could generate my own id but I don't like that solution. I will look at hadoop.t...
   Author: Bertrand Dechoux, 2012-09-14, 05:38
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