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From Michael McCandless <>
Subject Re: Upgrade from 1.4.3 to 1.9.1. Any problems with using existing index files?
Date Fri, 25 Aug 2006 11:25:08 GMT

> We are upgrading from Lucene 1.4.3 to 1.9.1, and have many customers 
> with large existing index files. In our testing we have reused large 
> indexes created in 1.4.3 in 1.9.1 without incident. We have looked 
> through the changelog and the code and can't see any reason there should 
> be any problems doing so.
> So, we're just wondering, has anyone had any problems, or is there 
> anything we need to look out for?

Looking at the code and also at the file formats specification:

I believe this is completely fine.  Meaning, the 1.9.x code can open the 
older index format for both searching and writing (either deletes or 
added docs), without issue.


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