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From Michael McCandless <>
Subject Re: Lucene Index backward compatibility related question
Date Tue, 28 Aug 2012 12:55:40 GMT
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

On Mon, Aug 27, 2012 at 2:35 PM, Stephen Howe <> 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
> 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 <>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
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