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Re: Algorithm for cross product - MapReduce - [mail # user]
...If you have scaling problems, check out the Mahout project. They are all about distributed scalable linear algebra & more. http://mahout.apache.org  Lance  On Wed, Jun 22, 2011 at ...
   Author: Lance Norskog, 2011-06-23, 00:33
Re: A way to monitor HDFS for a file to come live, and then kick off a job? - MapReduce - [mail # user]
...Hamake does exactly this:  http://code.google.com/p/hamake/  On Fri, Mar 25, 2011 at 9:46 AM, Allen Wittenauer  wrote: nce this is really about watching files in HDFS. ob. if ...
   Author: Lance Norskog, 2011-05-15, 22:09
bin/daemon.sh problem with memory args - MapReduce - [mail # user]
...Somehow, in the long chain of shell variable fiddling that creates the command line in bin/daemon.sh, there is a small mistake. The command line for tasktracker comes out (shorn of many othe...
   Author: Lance Norskog, 2011-04-08, 04:37
Re: Dataset comparison and ranking - views - MapReduce - [mail # user]
...The Mahout project has several tools for this class of problem. http://mahout.apache.org  On Tue, Mar 8, 2011 at 9:07 AM, Chase Bradford  w rote: at nchor  region  way ar...
   Author: Lance Norskog, 2011-03-10, 06:38
Re: how to write custom object using M/R - MapReduce - [mail # user]
...Does you custom object have Writable implemented? Also, does it have toString() implemented? I think this means the Writable code does not work:  K  CustomObject@2b237512 K  C...
   Author: Lance Norskog, 2011-01-17, 09:51
Re: How can I compile and use my own hadoop? - MapReduce - [mail # user]
...I write simple driver classes and run them from Eclipse. It takes some fiddling, so if you're not comfortable with that, running it from ant is your best bet.  On Mon, Nov 8, 2010 at 9:...
   Author: Lance Norskog, 2010-11-09, 07:42
Re: Predicting how many values will I see in a call to reduce? - MapReduce - [mail # user]
...It is key to the scheduling paradigm of Hadoop that it doesn't have to tell you how many or when. It would have to store up all of the data for your key before activating your reducer. This ...
   Author: Lance Norskog, 2010-11-09, 07:40
Re: Is continuous map reduce supported - MapReduce - [mail # user]
...Dead link:  http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/mapred/lib/ChainReducer.html  On Wed, Sep 1, 2010 at 9:56 AM, Owen O'Malley  wrote:    ...
   Author: Lance Norskog, 2010-09-02, 03:33
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