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Re: question for understanding partitioning - MapReduce - [mail # user]
...1) you need not have 26 reducers but you want 26 partitions - you might send to     int reducer = character % Math.min(26,nreducers);  // this insures that all items with A go...
   Author: Steve Lewis, 2011-01-18, 20:33
Re: Mapper runs only on one machine - MapReduce - [mail # user]
...Are you sure your input file is splittable - many files (say gzip) are not and such files must be processed on a single machine  On Tue, Nov 16, 2010 at 9:24 AM,  wrote:   &nb...
   Author: Steve Lewis, 2010-11-16, 17:33
Re: Big split file to Partitioner - MapReduce - [mail # user]
...It is a good idea to ask what the meaning of ths split is. Typically a split is one per line but I have written splits which return the entire file for a small file - say an xml document &nb...
   Author: Steve Lewis, 2010-08-22, 17:47
Re: Fixing a failed reduce task - MapReduce - [mail # user]
...Yes - of course but the question is whether there is a way to do it while the job is running rather than restarting with different parameter  On Tue, Jul 13, 2010 at 4:51 PM, Ted Yu &nb...
   Author: Steve Lewis, 2010-07-14, 01:57
Restarting a cluster - MapReduce - [mail # user]
...We have a cluster with 4 Cloudera VMs -   hadoop fs -ls / says 10/07/12 05:42:22 INFO ipc.Client: Retrying connect to server: localhost/ 127.0.0.1:8022. Already tried 0 time(s). 10/07/1...
   Author: Steve Lewis, 2010-07-12, 18:51
How does performance scale with the size of the data? - MapReduce - [mail # user]
...Assume we have a medium size cluster - say 20 nodes and that the cluster is used for one job and cannot change in size. Assume we are sorting a large data set. As we increase the size of the...
   Author: Steve Lewis, 2010-07-01, 05:15
Re: Who creates job.jar? - MapReduce - [mail # user]
...I have attached code for creating a Hadoop Jar - All you need to do is run HadoopDeployer in the same environment that your hadoop job runs as a local process (You did test your job in this ...
   Author: Steve Lewis, 2010-06-25, 15:55
Custom File reader - MapReduce - [mail # user]
...I have a number of files which can be read and converted into a series of lines of lext - however the means of reading the file is not known to the standard Hadoop splitters. I understand th...
   Author: Steve Lewis, 2010-06-24, 19:44
Using a custom FileSplitter? - MapReduce - [mail # user]
...Assume I have one of the two situations (I have both) 1) I have a directory with several hundred files - of these some fraction need to be passed to the mapper (say the ones ending in ".foo"...
   Author: Steve Lewis, 2010-06-23, 17:21
Newbie - question - how do I use Hadoop to sort a very large file - MapReduce - [mail # user]
...Assume I have a large file called *BigData.unsorted*  ( say 500GB) consisting of lines of text. Assume that these lines are in random order - I understand how to assign a key to lines a...
   Author: Steve Lewis, 2010-06-23, 17:15
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