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From Yonik Seeley <yo...@lucidimagination.com>
Subject Re: Lucene's default settings & back compatibility
Date Wed, 20 May 2009 12:28:38 GMT
On Wed, May 20, 2009 at 7:22 AM, Michael McCandless
<lucene@mikemccandless.com> wrote:
> So I think you're suggesting something like this: when you use Lucene,
> if you want "latest and greatest" defaults, do nothing.
>
> If instead you want defaults to match a particular past minor release,
> you must call (say) LuceneVersions.setVersion(VERSION_21).

Either way would work - we could reverse it for stronger back compat if desired.
For 3.0, and all 3.x releases, set actsAsVersion=30000 by default in Lucene.
A program could set actsAsVersion=LUCENE_VERSION_ANY (999999) and
always get new behavior,
or just  choose the specific version they are using to test/develop
with; actsAsVersion=30201 to get the behavior changes of 3.2.1

But since 3.0 is a major release anyway, we could change the default
of actsAsVersion with each 3.x release (or just set it to 39999) and
require that a users set actsAsVersion=30000 (or whatever version they
are on) in order to get maximum back compatibility.

For 2.9, we could start changing behavior and default
actsAsVersion=20401 (or 20499?) to act like the latest 2.4.x release.

And we could still leisurely proceed with Settings classes where they
made sense.

-Yonik
http://www.lucidimagination.com

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