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Re: Keeping track of the mappers that feed a reducer - MapReduce - [mail # user]
...Why not just materialise the mapper information into the values that are emitted?  No need to rewrite Hadoop - just change the application code.  On 13 March 2013 08:31, preethi ga...
   Author: Paul Wilkinson, 2013-03-13, 10:15
Re: OutOfMemory during Plain Java MapReduce - MapReduce - [mail # user]
...As always, what Harsh said :)  Looking at your reducer code, it appears that you are trying to compute the distinct set of user IDs for a given reduce key. Rather than computing this by...
   Author: Paul Wilkinson, 2013-03-08, 12:09
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