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RE: Hadoop Pi map-reduce job hangs - Hadoop - [mail # user]
...Hi Anand,       Can you check the task attempt logs for job, what is happening in the re duce task.      Thanks  Devaraj  ____________________________...
   Author: Devaraj k, 2012-08-08, 05:15
RE: Creating MapFile.Reader instance in reducer setup - Hadoop - [mail # user]
...Can you share the exception stack trace and piece of code where you are try ing to create?   Thanks Devaraj  ________________________________________ From: OndÅ™ej Klimpera [[EMAIL ...
   Author: Devaraj k, 2012-06-19, 13:40
RE: InvalidJobConfException - Hadoop - [mail # user]
...By default it uses the TextOutputFomat(subclass of FileOutputFormat) which checks for output path.   You can use NullOuputFormat or your custom output format which doesn't do any thing ...
   Author: Devaraj k, 2012-06-08, 10:54
[expand - 1 more] - RE: What happens when I do not output anything from my mapper - Hadoop - [mail # user]
...The output files should 0 kb size if you use FileOutputFormat/TextOutputFormat.   I think your output format writer is writing some meta data in those files. Can you check what is the d...
   Author: Devaraj k, 2012-06-05, 05:22
RE: Grouping comparator - Hadoop - [mail # user]
...If you don't specify grouping comparator for your Job, it uses the Output Key Comparator class for grouping.  This comparator should be provided if the equivalence rules for keys sortin...
   Author: Devaraj k, 2012-06-04, 12:33
RE: MapReduce combiner issue : EOFException while reading Value - Hadoop - [mail # user]
...Can you check ValueCollection.write(DataOutput) method is writing properly whatever you are expecting in readFields() method.   Thanks Devaraj  ____________________________________...
   Author: Devaraj k, 2012-05-31, 09:45
RE: about rebalance - Hadoop - [mail # user]
...You can run the balancer in any node. It is not suggested to run in namenode and would be better to run in a node which has less load.  Each data node has a limited bandwidth for rebala...
   Author: Devaraj k, 2012-05-30, 04:37
RE: How to mapreduce in the scenario - Hadoop - [mail # user]
...Hi Gump,     Mapreduce fits well for solving these types(joins) of problem.  I hope this will help you to solve the described problem..  1. Mapoutput key and value classe...
   Author: Devaraj k, 2012-05-29, 10:40
RE: contributing as student - Hadoop - [mail # dev]
...Good to hear Hasan.  Welcome to the Hadoop community. You can find more details in the below lin k for how to contribute.   http://wiki.apache.org/hadoop/HowToContribute   Tha...
   Author: Devaraj k, 2012-05-29, 09:32
RE: [VOTE] Release hadoop-2.0.0-alpha-rc1 - Hadoop - [mail # general]
...+1, I downloaded,  installed in a small cluster and ran few mapred jobs and yarn applications. Everything worked fine for me.   Thanks Devaraj  _______________________________...
   Author: Devaraj k, 2012-05-21, 06:13
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