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From Paul Davis <>
Subject Re: Map/Reduce/Merge on the roadmap?
Date Wed, 01 Jul 2009 03:49:26 GMT

The idea has been broached a couple times. I've looked at it some as
have other people. There's enough difference between the M/R/M model
and the built-in M/R view engine that I doubt it'll be added to the
current built-in engine. We've been talking about adding a contrib
directory and a solid implementation of M/R/M would probably be in the
front running for inclusion and motivation to work on integrating
mechanics for adding new types of indexers.

Paul Davis

On Tue, Jun 30, 2009 at 11:29 PM, Daniel Gagne<> wrote:
> I was wondering if Merge of the map/reduce/merge paradigm (
> I looked on the wiki but was unable to find any reference to merge, I assume
> it would appear here if anywhere:
> I know that similar functonality can be achieved through reduce using an
> internal hash table, I believe this is how the tags sample code on the wiki
> behaves.  Unfortunately, if the size of that hash table becomes too large
> performance begins to crawl as the rereduce step begins to spend a large
> amount of time merging hashtables.
> I'll be more than happy to update the wiki with whatever I hear the proposed
> future plan is.
> Thanks in advance,
> Danny

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