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Re: why reduce doesn't work by HBase? - MapReduce - [mail # user]
...Hi Yong,  A few ways to understand a problem (with Hadoop) : 1) Write tests, using MRUnit for example (http://mrunit.apache.org/) 2) Use @Override to make sure you are indeed overriding...
   Author: Bertrand Dechoux, 2012-11-15, 20:56
Re: Question about MapReduce - MapReduce - [mail # user]
...That would be "mapred.task.timeout". You should download hadoop source, that way you would have the conf files with all the default configuration. (You could also get them online but lots of...
   Author: Bertrand Dechoux, 2012-11-14, 08:51
Re: Optimizing Disk I/O - does HDFS do anything ? - MapReduce - [mail # user]
...People are welcome to complement but I guess the answer is : 1) Hadoop is not running on windows (I am not sure if Microsoft made any statement about the OS used for Hadoop on Azure.) -> ...
   Author: Bertrand Dechoux, 2012-11-13, 21:10
Re: Can dynamic Classes be accessible to Mappers/Reducers? - MapReduce - [mail # user]
...You should look at the job conf file. You will see that indeed the class for the mapper and reducer are explicitly written. So if you generate the class only on the client, the other machine...
   Author: Bertrand Dechoux, 2012-11-13, 08:55
Re: combiner/reducer context in java class - MapReduce - [mail # user]
...I agree that the behaviour shouldn't be dynamically changed at runtime with regard to the class being use as a Combiner or a Reducer but someone may want to produce counters in order to have...
   Author: Bertrand Dechoux, 2012-11-06, 11:42
Re: Task does not enter reduce function after secondary sort - MapReduce - [mail # user]
...Only to be clear but the @Override annotation has no impact by itself. However if you put it then the compiler can check for you that you are indeed overriding a method. If you don't use the...
   Author: Bertrand Dechoux, 2012-11-05, 10:39
Re: Data locality of map-side join - MapReduce - [mail # user]
...One underlying issue is that you would like your tool to be able to detect which dataset is the largest and how large is it because with this information different strategies can be chosen. ...
   Author: Bertrand Dechoux, 2012-10-25, 07:17
Re: Hadoop counter - MapReduce - [mail # user]
...And by default the number of counters is limited to 120 with the mapreduce.job.counters.limit property. They are useful for displaying short statistics about a job but should not be used for...
   Author: Bertrand Dechoux, 2012-10-19, 14:50
Re: WEKA logistic regression on hadoop - MapReduce - [mail # user]
...Weka is indeed a more complete package of data mining solutions but its aim is not to support Hadoop whereas it is the aim of Mahout.  The implemented methods are standard data mining m...
   Author: Bertrand Dechoux, 2012-10-16, 13:58
Re: Logistic regression package on Hadoop - MapReduce - [mail # user]
...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...
   Author: Bertrand Dechoux, 2012-10-15, 12:53
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