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From Grant Ingersoll <>
Subject Re: Lucene index compatibility
Date Thu, 28 Jan 2010 13:55:05 GMT

On Jan 28, 2010, at 6:03 AM, kumarlimbu wrote:

> Hi Everyone,
> We are currently using Lucene 1.9. We want to upgrade our application from
> 1.9 to 2.9. The reasons for upgrade is we want to get better performance. 
> What we are unsure of is whether a Lucene index created using version 1.9
> will be compatible with a new application built using lucene 2.9? Are they
> compatible or we are required to recreate the index again with the newer
> version of Lucene.

I doubt anyone has tried this, so your best bet will be to test it.  It is probably more likely
to be successful if you can go from 1.9->2.0 ->2.9, but even that isn't a guarantee
depending on some of the back compatibility breaks that have occurred.

How hard would it be to simply re-index?

> Thanks in advance.
> -- 
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Grant Ingersoll

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