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From Brian Candler <>
Subject Re: reduce_limit error
Date Tue, 05 May 2009 19:50:26 GMT
On Mon, May 04, 2009 at 03:08:38PM -0700, Chris Anderson wrote:
> 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 think that 200 byte limit is too low, as I have now had to turn off the
reduce_limit on my server for this:

RestClient::RequestFailed: 500 reduce_overflow_error (Reduce output must
shrink more rapidly. Current output: '[{"v4/24": 480,"v4/20": 10,"v4/26":
10,"v4/19": 3,"v4/27": 23,"v4/18": 1,"v4/28": 32,"v4/32": 424,"v4/25":
17,"v4/30": 28,"v4/22": 15,"v4/16": 200,"v4/29": 74,"v4/21": 1,"v4/14":
41,"v4/12": 1,"v4/13": 1,"v4/17": 4,"v4/11": 1}]')

I'd have thought a threshold of 4KB would be safe enough?



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