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From Daniel Noll <>
Subject Re: updating the data in Lucene
Date Tue, 23 May 2006 23:25:50 GMT
Erik Hatcher wrote:
> On May 23, 2006, at 8:15 AM, Alberto Marqu├┐ffffe9s wrote:
>> I have a question about like updating the data in Lucene. Supposing 
>> that I have indexed a directory if I want to refresh index (to return 
>> to index single files that has been modified). In order to maintain 
>> the data updated. There is faster form to do the one that using: 
>> IndexWriter(indexDir, new Analizer(), true); indexaria all the files 
>> again.
> absolutely.  you'll need to create the logic to do incremental indexing, 
> but lucene supports deleting and adding documents.  an "update" consists 
> of locating the document to be updated in the index, deleting it, and 
> re-adding the document.

Although, one should note that this is semantically different from 
"updating" a document.  Deleting the document and re-adding it results 
in the text index IDs changing, whereas a true, in-place update would not.

The ability to do a true, in-place update is like the holy grail of 
Lucene. :-)


Daniel Noll

Nuix Pty Ltd
Suite 79, 89 Jones St, Ultimo NSW 2007, Australia    Ph: +61 2 9280 0699
Web:                        Fax: +61 2 9212 6902

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