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[expand - 7 more] - Re: Ant Colony Optimization for Travelling Salesman Problem in Hadoop - MapReduce - [mail # user]
...of course but do your reducers subclass org.apache.hadoop.mapreduce.Reducer or org.apache.hadoop.mapred.Reducer  On Tue, May 8, 2012 at 8:32 AM, sharat attupurath wrote:    St...
   Author: Steve Lewis, 2012-05-08, 16:22
Re: Debug MR tasks impossible. - MapReduce - [mail # user]
...You can run a job in local mode without a cluster and run in a debugger enabling breakpoints single stepping - examination of variables ... If you do this 1)  Choose a SMALL problem 2) ...
   Author: Steve Lewis, 2012-03-29, 16:32
[expand - 1 more] - Re: CSV files as input - MapReduce - [mail # user]
...Two other points - if you have several input files make a custom input whose reader make  protected boolean isSplitable(JobContext context, Path file) return false and you do not have p...
   Author: Steve Lewis, 2012-02-23, 00:13
Al ljobs fail with the erros - MapReduce - [mail # user]
...All of my current jobs and the wordcount I used when learning are all failing with the same error  glados9.systemsbiology.net:50060/tasklog?plaintext=true&taskid=attempt_201202141331_00...
   Author: Steve Lewis, 2012-02-14, 22:10
Re: Why it don't print anything into part-00000 file - MapReduce - [mail # user]
...1 run locally ether problem is small and until you can run a small local problem do not mover to the cluster. 2 make sure ether mapper writes something set a breakpoint at the write call. 3 ...
   Author: Steve Lewis, 2012-01-31, 16:09
[expand - 1 more] - Re: distributing a time consuming single reduce task - MapReduce - [mail # user]
...It sounds like the  HierarchicalClusterer  whatever that is is doing what a collection of reducers should be doing - try to restructure the job so that the clustering is done more ...
   Author: Steve Lewis, 2012-01-24, 02:09
I am trying to run a large job and it is consistently failing with timeout - nothing happens for 600 sec - MapReduce - [mail # user]
...The map tasks fail timing out after 600 sec. I am processing one 9 GB file with 16,000,000 records. Each record (think is it as a line)  generates hundreds of key value pairs. The job i...
   Author: Steve Lewis, 2012-01-18, 22:05
Writing large output kills job with timeout _ need ideas - MapReduce - [mail # user]
...I am running a mapper job which generates a large number of output records for every input record. about 32,000,000,000 output records from about 150 mappers - each record about 200 bytes Th...
   Author: Steve Lewis, 2012-01-18, 17:49
How do I use a MapFile as an output in 0.202 - MapReduce - [mail # user]
...MaoFileOutputFormat is in the mapred package but not the MapReducePackage   Steven M. Lewis PhD 4221 105th Ave NE Kirkland, WA 98033 206-384-1340 (cell) Skype lordjoe_com...
   Author: Steve Lewis, 2012-01-11, 00:47
How can I reduce the number of nodes used by a job - MapReduce - [mail # user]
...I am reporting on performance of a hadoop task on a cluster with about 50 nodes. I would like to be able to report performance on clusters of 5,10,20 nodes without changing int current clust...
   Author: Steve Lewis, 2011-12-15, 22:03
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