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Expected behavior of nested UserGroupInformation - MapReduce - [mail # user]
...Hi,  I am using UserGroupInformation.doAs(...) in order to launch a job programmatically from a remote application. I was wondering : what is the expected behavior of nested UserGroupIn...
   Author: Bertrand Dechoux, 2012-09-12, 10:28
Re: How get information messages when a JobControl is used ? - MapReduce - [mail # user]
...But as far as I know there is no way to have a snapshot of the JobControl state. https://issues.apache.org/jira/browse/MAPREDUCE-3562  I was trying only to get the state of all jobs and...
   Author: Bertrand Dechoux, 2012-09-12, 10:21
Re: New Learner for Haddop and Hive - MapReduce - [mail # user]
...1) First do not post across multiple mailing list. I am replying to all in order to share my answer but you should then reply only on the mailing list which is concerned with your issue. 2) ...
   Author: Bertrand Dechoux, 2012-09-05, 09:37
Re: how to execute different tasks on data nodes(simultaneously in hadoop). - MapReduce - [mail # user]
...Hi,  Assuming you have to compute these value for every RGB pixel. Why couldn't you compute all these values at the same time on the same node?  Hadoop let you distribute your comp...
   Author: Bertrand Dechoux, 2012-09-03, 17:41
Re: knowing the nodes on which reduce tasks will run - MapReduce - [mail # user]
...Hi,  The reducer is run where there is slot available, the location is not related to where the data is located and it is not possible to choose where the reducer will run (except by tw...
   Author: Bertrand Dechoux, 2012-09-03, 15:24
[MAPREDUCE-4583] Wrong paths for CapacityScheduler/FairScheduler jar in documentation - MapReduce - [issue]
...Both documentationshttp://hadoop.apache.org/common/docs/r1.0.3/fair_scheduler.htmlhttp://hadoop.apache.org/common/docs/r1.0.3/capacity_scheduler.htmlsay that the jar should be copied from th...
http://issues.apache.org/jira/browse/MAPREDUCE-4583    Author: Bertrand Dechoux, 2012-08-24, 17:08
Re: Reading multiple lines from a microsoft doc in hadoop - MapReduce - [mail # user]
...And that would help you with performance too. Were you originally planning to have one file per word document? What is the average size of you word documents? It shouldn't be much. I am afra...
   Author: Bertrand Dechoux, 2012-08-24, 06:10
Re: Running map reduce job from a web application - MapReduce - [mail # user]
...I haven't been confronted to your use case but your error message explicitly says that you are not passing correctly the user "hadoop". You should use the doAs() method on UserGroupInformati...
   Author: Bertrand Dechoux, 2012-08-24, 05:57
Re: About many user accounts in hadoop platform - MapReduce - [mail # user]
...You might also want to look at Hadoop On Demand. http://hadoop.apache.org/common/docs/r0.17.0/hod.html  But I would not recommend to make one cluster per user.  Regards  Bertr...
   Author: Bertrand Dechoux, 2012-08-24, 05:40
Re: Copy the content of the input splits - MapReduce - [mail # user]
...I don't know any helper class doing it but you could simply open a local file and with your mapper write all the key/value which are provided. Now the question is why would you want to do th...
   Author: Bertrand Dechoux, 2012-08-23, 05:43
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