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Difference between combiner and aggregator - MapReduce - [mail # user]
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...Hi, I am trying to understand the difference between combiner and aggregator. Based on my readings: Wordcount example (mapper) aggregator class Mapper method MAP &nb...
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Author: jamal sasha,
2013-04-05, 20:30
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Re: Finding mean and median python streaming - MapReduce - [mail # user]
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...Hi, I have a question. Why do I need to set number of reducers to 1. Since all the keys are sorted shouldnt most of the keys go to same reducer? On Tue, Apr 2, 2013 at 2:...
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Author: jamal sasha,
2013-04-04, 20:24
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Basic hadoop MR question - MapReduce - [mail # user]
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...Hi, I have a quick question. I am trying to write MR code using python. In the word count example: http://www.michael-noll.com/tutorials/writing-an-hadoop-mapreduce-program-in-python/ ...
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Author: jamal sasha,
2013-04-02, 21:38
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Finding mean and median python streaming - MapReduce - [mail # user]
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...Very dumb question.. I have data as following id1, value 1, 20.2 1,20.4 .... I want to find the mean and median of id1? I am using python hadoop streaming.. mapper.py for line in sys.s...
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Author: jamal sasha,
2013-04-01, 21:25
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Hadoop streaming weird problem - MapReduce - [mail # user]
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...Hi, I am facing a weird problem. My python scripts were working just fine. I made few modifications.. tested via: cat input.txt | python mapper.py | sort | python reducer.py &nb...
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Author: jamal sasha,
2013-03-29, 00:10
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Re: copy chunk of hadoop output - MapReduce - [mail # user]
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...Though it copies.. but it gives this error? On Fri, Mar 1, 2013 at 3:21 PM, jamal sasha wrote: ...
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Author: jamal sasha,
2013-03-01, 23:27
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Re: copy chunk of hadoop output - MapReduce - [mail # user]
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...When I try this.. I get an error cat: Unable to write to output stream. Are these permissions issue How do i resolve this? THanks On Wed, Feb 20, 2013 at 12:21 PM, Harsh J ...
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Author: jamal sasha,
2013-03-01, 23:21
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Re: copy chunk of hadoop output - MapReduce - [mail # user]
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...Awesome thanks :) On Tue, Feb 19, 2013 at 2:14 PM, Harsh J wrote: ...
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Author: jamal sasha,
2013-02-19, 22:16
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copy chunk of hadoop output - MapReduce - [mail # user]
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...Hi, I was wondering in the following command: bin/hadoop dfs -copyToLocal hdfspath localpath can we have specify to copy not full but like xMB's of file to local drive? Is...
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Author: jamal sasha,
2013-02-19, 22:08
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Re: passing arguments to hadoop job - MapReduce - [mail # user]
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...Hi, The driver code is actually the same as of java word count old example: copying from site public static void main(String[] args) throws Exception { JobConf conf = ne...
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Author: jamal sasha,
2013-01-22, 05:49
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