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how to differentiate which input directory current record comes from? - MapReduce - [mail # user]
...If you use the new API, you can access the MapContext object in the setup method of the mapper. Then, you can get the input split with MapContext#getInputSplit(), cast it to FileSplit and ob...
   Author: Sigurd Spieckermann , 2012-12-15, 10:17
[expand - 1 more] - Tell Hadoop to store pairs of files at the same location(s) on HDFS - MapReduce - [mail # user]
...Awesome! That's exactly what I'm looking for. Hadn't seen the JIRA. I  hope this is coming soon!  Am 05.12.2012 18:58, schrieb Harsh J: > You are probably talking of > https:...
   Author: Sigurd Spieckermann , 2012-12-05, 19:26
[expand - 4 more] - Spill file compression - MapReduce - [mail # user]
...When I log the calls of the combiner function and print the number of elements iterated over, it is all 1 during the spill-writing phase and the combiner is called very often. Is this normal...
   Author: Sigurd Spieckermann , 2012-11-07, 15:14
[expand - 2 more] - Data locality of map-side join - MapReduce - [mail # user]
...Thanks for all your answers so far! There's still one question open which I can't seem to find an answer for in the source code or documentation. When I specify the two source directories of...
   Author: Sigurd Spieckermann , 2012-11-06, 09:00
Join-package in new API? - MapReduce - [mail # user]
...Hi,  I've just noticed that the join-package only exists in the old map-reduce API. Is there a particular reason why it's not in the new API? (deprecated maybe?) If so, what is the appr...
   Author: Sigurd Spieckermann , 2012-10-10, 14:47
Usefulness of ChainMapper/ChainReducer - MapReduce - [mail # user]
...Hi guys,  I have stumbled upon ChainMapper and ChainReducer and I am wondering why they exist. I imagine that everything you can implement with ChainMapper and ChainReducer can be imple...
   Author: Sigurd Spieckermann , 2012-09-28, 13:32
[expand - 3 more] - Join-package combiner number of input and output records the same - MapReduce - [mail # user]
...I'm not doing a conventional join, but in my case one split/file  consists of only one key-value pair. I'm not using default  mapper/reducer implementations. I'm guessing the probl...
   Author: Sigurd Spieckermann , 2012-09-25, 16:34
[expand - 5 more] - Reading from HDFS from inside the mapper - MapReduce - [mail # user]
...OK, I see... Is there any way to change this? I need guaranteed order in order for the map-side join to work correctly and I need the standalone mode for debugging code that is executed on t...
   Author: Sigurd Spieckermann , 2012-09-17, 13:50
Hadoop CompositeInputFormat block matrix-vector multiplication - MapReduce - [mail # user]
...Hi guys,  I am trying to implement a block matrix-vector multiplication algorithm with Hadoop according to the schematics from http://i.stanford.edu/~ullman/mmds/ch5.pdf page 162. My ma...
   Author: Sigurd Spieckermann , 2012-09-04, 13:44