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Re: 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
Re: 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
Re: Data locality of map-side join - MapReduce - [mail # user]
...Interesting to know that Hive and Pig are doing something in this direction. I'm dealing with the Hadoop join-package which doesn't use DistributedCache though but it rather pulls the other ...
   Author: Sigurd Spieckermann, 2012-10-23, 09:22
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
Re: 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
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