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From Adam Kocoloski <>
Subject Re: reduce_limit error
Date Mon, 04 May 2009 22:23:13 GMT
Thanks for the note, Chris. It might be nice if we could figure out a  
way not to print "wazzup" N*1000 times when the test suite runs :-)   
Other than that, cool!  Should make support a good bit easier.


On May 4, 2009, at 6:08 PM, Chris Anderson wrote:

> Devs,
> I'm checking in a patch that should cut down on the number of mailing
> list questions asking why a particular reduce function is hella slow.
> Essentially the patch throws an error if the reduce function return
> value is not at least half the size of the values array that was
> passed in. (The check is skipped if the size is below a fixed amount,
> 200 bytes for now).
> I expect this heuristic will need fine tuning. Ideally we'd never
> raise the error on "good" reduces, and always raise it on
> "ill-conceived" ones. If you hit the error on a reduce that seems like
> it should be considered good, please ping the list so we have an
> opportunity to fine-tune.
> There is a config option:
> [query_server_config]
> reduce_limit = true
> changing this to false will revert to the old behavior. Ideally very
> few applications will require this config change, so if you find
> yourself changing this setting, it's a sign you should mail the list.
> -- 
> Chris Anderson

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