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From Michael McCandless <luc...@mikemccandless.com>
Subject Re: Lucene's default settings & back compatibility
Date Fri, 22 May 2009 18:30:38 GMT
On Fri, May 22, 2009 at 2:27 PM, DM Smith <dmsmith555@gmail.com> wrote:
> Marvin Humphrey wrote:
>>>
>>> I feel the opposite: I'd like new users to see improvements by
>>> default, and users that require strict back-compate to ask for that.
>>>
>>
>> By "strict back-compat", do you mean "people who would like their search
>> app to
>> not fail silently"? ;)  A "new user" who follows your advice...
>>
>>   // haha stupid noob   StandardAnalyzer analyzer = new
>> StandardAnalyzer(Versons.LATEST);
>>
>> ... is going to get screwed when the default tokenization behavior
>> changes.
>> And it would be much worse if we follow my preference for making the arg
>> optional without following my preference for keeping defaults intact:
>>
>>   // haha eat it luser   StandardAnalyzer analyzer = new
>> StandardAnalyzer();
>>
>> It's either make the arg mandatory when changing default behavior and
>> recommend that new users pass a fixed argument, or make it optional but
>> keep
>> defaults intact between major releases.
>
> I think I see your point: A new user is such only for the first release that
> they use Lucene. For a first use, there is no backward compatibility
> problem. On the use of a subsequent release, their code still gets the
> latest and greatest and now by the choice they were guided to make, they may
> have broken backward compatibility.
>
> So for any user, the only save, thus acceptable use is to never have
> Versions.LATEST, but only a specific version.

Right, we would have to not provide Versions.LATEST, ie if you want
latest, you'd pick Versions.LUCENE_29 (in 2.9).

Mike

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