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[expand - 1 more] - Re: Error: Java Heap space - MapReduce - [mail # user]
...Is it happening in map or reduce phase, and are you allocating anything in your mappers/reducers? For example if you are having a collection in one of them, this might be causing the heap er...
   Author: Dieter De Witte, 2013-12-31, 11:47
Re: How to set "hadoop.tmp.dir" if I have multiple disks per node? - MapReduce - [mail # user]
...Hi,  Make sure to also set mapred.local.dir to the same set of output directories, this is were the intermediate key-value pairs are stored!  Regards, Dieter   2013/12/16 Tao ...
   Author: Dieter De Witte, 2013-12-16, 08:12
[expand - 1 more] - Re: mapred.tasktacker.reduce.tasks.maximum issue - MapReduce - [mail # user]
...you could make the values final: add  true  to make sure they cannot be overridden..   2013/11/14 Vincent Y. Shen  ...
   Author: Dieter De Witte, 2013-11-14, 15:02
Re: CompateTo() in WritableComparable - MapReduce - [mail # user]
...A writableComparable is an interface. A key in mapreduce needs to implement it, since the keys need to be compared for equality. So it has nothing to do with key value pairs as such.  R...
   Author: Dieter De Witte, 2013-11-04, 10:41
Re: Why the reducer's input group count is higher than my GroupComparator implementation - MapReduce - [mail # user]
...Did you overwrite the partitioner as well?   2013/10/29 java8964 java8964  ...
   Author: Dieter De Witte, 2013-10-29, 07:57
Re: map phase does not read intermediate results with SequenceFileInputFormat - MapReduce - [mail # user]
...The question is also on stackoverflow, the problem is that she divides by zero in the second mapper I think. (the logs show that both jobs have a data flow..   2013/10/25 Robin East &nb...
   Author: Dieter De Witte, 2013-10-25, 10:16
disk errors during reducer's sorting phase - MapReduce - [mail # user]
...Hi all,  I am currently pushing the limits of my hadoop cluster. Unfortunately I am a bit confused about the memory requirements during the copy phase and the sort phases. I have made a...
   Author: Dieter De Witte, 2013-10-21, 09:40
Re: number of map and reduce task does not change in M/R program - MapReduce - [mail # user]
...Anseh,  Let's assume that your job is fully scalable, then it should take: 100 000 000 / 600 000 times the amount of time of the first job, which is 1000 / 6 = 167 times longer. This is...
   Author: Dieter De Witte, 2013-10-21, 07:09
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