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Re: knowing the nodes on which reduce tasks will run - MapReduce - [mail # user]
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...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...
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Author: Bertrand Dechoux,
2012-09-03, 15:24
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[MAPREDUCE-4583] Wrong paths for CapacityScheduler/FairScheduler jar in documentation - MapReduce - [issue]
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...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...
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http://issues.apache.org/jira/browse/MAPREDUCE-4583
Author: Bertrand Dechoux,
2012-08-24, 17:08
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Re: Reading multiple lines from a microsoft doc in hadoop - MapReduce - [mail # user]
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...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...
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Author: Bertrand Dechoux,
2012-08-24, 06:10
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Re: Running map reduce job from a web application - MapReduce - [mail # user]
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...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...
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Author: Bertrand Dechoux,
2012-08-24, 05:57
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Re: About many user accounts in hadoop platform - MapReduce - [mail # user]
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...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...
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Author: Bertrand Dechoux,
2012-08-24, 05:40
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Re: Copy the content of the input splits - MapReduce - [mail # user]
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...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...
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Author: Bertrand Dechoux,
2012-08-23, 05:43
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Re: Hadoop's Avro dependencies. - MapReduce - [mail # user]
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...Also, if I am not mistaken, there is 2 kind of serializations in Hadoop. There is the one used by MapReduce for transmitting user data : Writable by default, indeed. But there is...
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Author: Bertrand Dechoux,
2012-08-22, 06:27
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Re: why is num of map tasks gets overridden? - MapReduce - [mail # user]
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...3) Similarly to 2, you could consider multithreading. So in each physical node you would only to have the equivalent in memory of what is required for a map while having the processing power...
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Author: Bertrand Dechoux,
2012-08-22, 06:23
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Re: Changing tab delimiter between key and value - MapReduce - [mail # user]
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...It's maybe a typo in your post but did put the stars too in your code/configuration? Because there isn't any... Regards Bertrand On Tue, Aug 21, 2012 at 6:51 PM, Bejoy Ks &...
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Author: Bertrand Dechoux,
2012-08-21, 17:27
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Re: why is num of map tasks gets overridden? - MapReduce - [mail # user]
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...http://wiki.apache.org/hadoop/HowManyMapsAndReduces Bertrand On Tue, Aug 21, 2012 at 2:19 PM, nutch buddy wrote: Bertrand Dechoux...
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Author: Bertrand Dechoux,
2012-08-21, 12:52
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