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References: <CC5A8FB5.8F85%psitowitz@verisign.com>
 <CAMZX-yY5ZyzFN8fhSdgfVwCnpxFZBxR3e=nbTRkB74h92yBMkg@mail.gmail.com>
From: Michael McCandless <lucene@mikemccandless.com>
Date: Tue, 28 Aug 2012 08:55:40 -0400
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 <CAL8PwkZXHOt-NxyT+X0Pk7YRU0ykGbHpizYmtMgsCDx70p6qAQ@mail.gmail.com>
Subject: Re: Lucene Index backward compatibility related question
To: java-user@lucene.apache.org
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Small correction here: you are able to "write" to a 3.x index using
4.0.  It's just that the newly created segments will be written using
the Lucene4x codec.

Mike McCandless

http://blog.mikemccandless.com


On Mon, Aug 27, 2012 at 2:35 PM, Stephen Howe <silentgunner@gmail.com> wrote:
> Paul,
>
> So long as you are not writing to the 3.x index, it appears Lucene 4.0 can
> read the indexes in a read only format. See Mike McCandle's blog post
> http://blog.mikemccandless.com/2012/07/lucene-400-alpha-at-long-last.html about
> the alpha release codecs. As to whether or not that codec allows you to
> leverage the Lucene 4.0 performance gains, I'll defer to someone wiser on
> the subject. I would imagine it does, but I'm not sure.
>
> Sincerely,
> Stephen
>
> On Wed, Aug 22, 2012 at 1:31 PM, Sitowitz, Paul <PSitowitz@verisign.com>wrote:
>
>> Hello,
>>
>> I have two products that are using Lucene: The first product creates the
>> Lucene indexes for some data using Lucene version 3.01. The second product
>> utilizes the indexes created by the first product for text search purposes
>> and is also using Lucene 3.01.  I understand that the latest version of
>> Lucene 4.0 has made several performance enhancements of which we would like
>> to be able to leverage by our second product.
>>
>> Question:   If we upgrade the second product to use Lucene 4.0, will we
>> still be able to take advantage of search related performance gains while
>> still using the index created using Lucene 3.01 by our first product? OR,
>> will we have to "bite the bullet" and upgrade BOTH products to use the
>> latest version of Lucene?
>>
>> Thanks in advance for you response.
>>
>> Sincerely,
>>
>> Paul Sitowitz
>>
>>
>> ________________________________
>> P a u l   S i t o w i t z
>> Core Engineering
>> VeriSign Naming Services
>>
>> 12061 Bluemont Way
>> Reston, VA 20190
>>
>> psitowitz@verisign.com   (email)
>> 703-948-3298                (office)
>> 703-626-3593                (mobile)
>>
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