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From Michael McCandless <>
Subject Re: modularization discussion
Date Sat, 07 May 2011 11:02:07 GMT
OK I opened:


On Sat, May 7, 2011 at 6:46 AM, Michael McCandless
<> wrote:
> I agree!  And I think you're saying the same thing as Grant.
> Ie, others are fully free to refactor stuff, as long as they don't
> hurt Solr/Lucene (functionality, performance).
> But you are tempering that with a nice dose of reality (successfully
> factoring out faceting will be insanely hard).
> I very much agree with that.
> And, I (and other refactor-itchers) very much want to hear the
> specific technical skepticism/concerns on a given module: that
> assessment is awesome and very useful.  In fact, I love your
> enumeration of how faceting is so well integrated into Solr so much
> that I'll go open an issue (to factor out faceting), and put your list
> in!
> I think this will mean, in practice, that the refactoring should
> itself proceed in baby steps.  Ie, birthing a new faceting module,
> iterating on it, etc., and then at some point cutting Solr over to it,
> are two events likely spread out substantially in time.
> Freedom to refactor/poach is the bread and butter of open source.
> Mike
> On Fri, May 6, 2011 at 4:35 PM, Chris Hostetter
> <> wrote:
>> : To me, the third camp is just saying the proof is in the pudding.  If
>> : you want to refactor, then go for it.  Just make sure everything still
>> : works, which of course I know people will (but part of that means
>> : actually running Solr, IMO).  Perhaps, more importantly don't get mad
>> : that if I have only one day a week to work on Lucene/Solr that I spend
>> : it putting a specific feature in a specific place.  Just because
>> : something can/should be modularized, doesn't mean that a person working
>> : in that area must do it before they add whatever they were working on.
>> : For instance, if and when function queries are a module, I will add to
>> : them there and be happy to do so.  In the meantime, I will likely add to
>> : them in Solr if that is something I happen to be interested in at that
>> : time b/c I can certainly add a new function in a day, but I can't
>> : refactor the whole module _and_ add my new function in a day.
>> +1
>> I want to get that printed on a t-shirt
>> the corrolarry issue in my mind...
>> I am happily in favor of code reuse and modularization in the abstract,
>> and when it works in practice i'm plesantly delighted.
>> But when people talk about modularization as a goal, and make a laundry
>> list things in solr that people think should be refactored into modules
>> (w/o showing specifics of what that module would look like) then i have a
>> hard time buying into some of these ideas panning out in a way that:
>>  a) is a useful module to people in and of itself
>>  b) doesn't hamstring the evolution/performance in solr.
>> To look at "faceting" as a concrete example, there are big the reasons
>> faceting works so well in Solr: Solr has total control over the
>> index, knows exactly when the index has changed to rebuild caches, has a
>> strict schema so it can make sense of field types and
>> pick faceting algos accordingly, has multi-phase distributed search
>> approach to get exact counts efficiently across multiple shards, etc...
>> (and there are still a lot of additional enhancements and improvements
>> that can be made to take even more advantage of knowledge solr has because
>> it "owns" the index that we no one has had time to tackle)
>> I find it really hard to picture a way that this code could be refactored
>> into a reusable module in such a way that it could have an API that would
>> be easily usable outside of Solr -- and when i do get a glimmer of an
>> inkling of what that might look like, that vision scares me because of how
>> that API might then "hobble" Solr's ability to leverage it's total control
>> of the underlying index to add additional performance/features.
>> To be crystal clear: I recognize that this is *my* hangup -- I am not
>> suggesting that "I am short sighted and have little imagination
>> therefore this code should never be modularized."
>> I'm trying to explain why i *personally* am hesitant and sceptical of how
>> well modularizations of features like like this might actually work in
>> practice, and why i'm not eager to jump in and contribute on a goal whose
>> end result is something that i can't fully picture (and when i can picture
>> it, i'm a little scared by what i see)
>> That doesn't mean i'm opposed to it happening -- i would love to live in
>> the land of candy where houses are made of ginger bread and sugar plums
>> grow on trees, I'm just too skeptical that such a land exists (or is as
>> great as legend describes) to go slogging along on an epic journey to try
>> and reach it -- i'm too old for that shit.
>> I'm certainly not going to stop anyone else fro going on that quest -- but
>> i am entitled to voice my skepticism and concerns, just as adventursome
>> folks are entitled to ignore me.
>> -Hoss
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