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From Mark Miller <>
Subject Re: RangeFilter performance problem using MultiReader
Date Fri, 10 Apr 2009 19:11:51 GMT
Mark Miller wrote:
> Michael McCandless wrote:
>> which is why I'm baffled that Raf didn't see a speedup on
>> upgrading.
>> Mike
> Another point is that he may not have such a nasty set of segments - 
> Raf says he has 24 indexes, which sounds like he may not have the 
> logarithmic sizing you normally see. If you have somewhat normal term 
> distribution for all 24 segments, the problem is not exasperated 
> nearly as much (along with not being so bad as its not using all of 
> the terms for the field).
Better clarify this: it will still be a problem - you still have all the 
extra seeks - but they are not as many wasted seeks that we can avoid 
like the problem with the tailed logarithmic segments.
> 24 segments is bound to be quite a bit slower than an optimized index 
> for most things - also 24 segments of similar size may also be worse 
> than the normal 24 segments with log dropping size.

- Mark

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