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Re: Cartesian product in hadoop - MapReduce - [mail # user]
...The approach which I proposed will have m+n i/o for reading datasets not the (m + n + m*n) and but further i/o due to spills and reading mapper output by reducer will be more as number of tu...
   Author: Ajay Srivastava, 2013-04-18, 15:18
Re: Cartesian product in hadoop - MapReduce - [mail # user]
...Yes, that's a crucial part.  Write a class which extends WritableComparator and override compare method. You need to set this class in job client as - job.setGroupingComparatorClass (Gr...
   Author: Ajay Srivastava, 2013-04-18, 11:45
Re: Need help optimizing reducer - MapReduce - [mail # user]
...Are you using combiner ? If not, that will be first thing to do.   On 05-Mar-2013, at 1:27 AM, Austin Chungath wrote:  ...
   Author: Ajay Srivastava, 2013-03-05, 06:30
Spilled records - MapReduce - [mail # user]
...Hi,  I was tuning mapred job to reduce number of spills and reached a stage where following numbers are same -  Spilled Records in map = Spilled records in reduce = Combine output ...
   Author: Ajay Srivastava, 2013-01-23, 10:34
Non utf-8 chars in input - MapReduce - [mail # user]
...Hi,  I am using default inputFormat class for reading input from text files but  the input file has some non utf-8 characters. I guess that TextInputFormat class is default inputFo...
   Author: Ajay Srivastava, 2012-09-11, 05:54
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