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From Christoph Kaser <>
Subject Re: Merging several taxonomy indexes for faceted search
Date Mon, 24 Oct 2011 09:43:03 GMT
Hi Shai,

thank you very much for pointing me to the TaxonymMergeUtils-class, it 
does exactly what I need.

I had only included the maven artifact for facet support and therefore 
did not see the (very helpful) examples package before.

Best regards,

Am 19.10.2011 21:02, schrieb Shai Erera:
> Hi Christoph,
> You can certainly do that, and there are a bunch of APIs that will help you
> do that. We have a very high-level utility called TaxonomyMergeUtils, which
> offers a bunch of merge() methods, each taking more parameters. Perhaps
> start with the simplest one (the one taking 4 directories) and see if that
> works for you. If you discover that you need more granular control over the
> merge process, let me know and I can point you at more lower-level API. In
> fact, TaxonomyMergeUtils is part of the examples and you should get access
> to its source code, so you can see the steps you need to follow (at the
> lower level) in its more detailed merge() method.
> Shai
> On Wed, Oct 19, 2011 at 9:54 AM, Christoph Kaser<>wrote:
>> Hi all,
>> I am planing to change my existing lucene index to use the new facets
>> introduced in lucene 3.4.0.
>> Unfortunately, I could not find an answer to my question in the
>> documentation:
>> I create a relatively large index of 8 million books by dividing it into
>> several smaller groups of documents, creating indices for them, and then
>> joining them all together to one big index using |IndexWriter.addIndexes|.
>> This allows the work to be split among several threads or even computers.
>> I now would like to add faceted search capabilities to my index to allow
>> grouping by author and publisher, but I have the following problem:
>> Can I merge/add/join several taxonomy indexes as created by
>> LuceneTaxonmyWriter, and if so, how would I do that?
>> Thanks in advance for any help!
>> Best Regards,
>> Christoph

Dipl.-Inf. Christoph Kaser

IconParc GmbH
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80333 München

Tel +49 -89- 15 90 06 - 21
Fax +49 -89- 15 90 06 - 49

Geschäftsleitung: Dipl.-Ing. Roland Brückner, Dipl.-Inf. Sven Angerer. HRB
121830, Amtsgericht München

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