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Subject: AW: Lucene internal document number?
Date: Fri, 6 Aug 2004 14:33:37 +0200
Message-ID: 
 <90BBF8FAA569414698E019D903E37DA703D92D@ihawk.win.xtramind.dfki.de>
Thread-Topic: Lucene internal document number?
Thread-Index: AcR7qiWuR2bNH98RQ+OBXODQafrBsgABkFNg
From: "Karsten Konrad" <Karsten.Konrad@xtramind.com>
To: "Lucene Users List" <lucene-user@jakarta.apache.org>


Hi,

>>

a have a short question it's regarding lucene internal document numbers: =

can you give me an idea where they are written into the index and how=20
they are generated?
>>

I am not 100% sure about the technical design, only
from my experience with Lucene:

The numbers depend on when the document was indexed.=20
The "older" the document, the smaller the number. All=20
documents are numbered from 0 to n-1 where n is the=20
number of documents the current reader sees. There
are never any "gaps" in this numbering.

There is, to my knowledge, no explicit point where
these numbers are written in the index. Think of
positions in a list - they are not part of the
list itself. You have to take into account that
these numbers may change for documents after=20
any deletions in the index.

Regards,

Karsten


--

Dr.-Ing. Karsten Konrad
Head of Artificial Intelligence Lab

Xtramind Technologies GmbH=20
Stuhlsatzenhausweg 3=20
D-66123 Saarbr=FCcken

Phone +49 (681) 3 02-51 13=20
Fax +49 (681) 3 02-51 09
karsten.konrad@xtramind.com=20
www.xtramind.com

>Besuchen Sie uns !
>DMS |  Halle 2 Stand 2705 |  07.- 09. September 2004 |  Messe Essen |  =
www.dmsexpo.de
>
>

-----Urspr=FCngliche Nachricht-----
Von: B. Grimm [Eastbeam GmbH] [mailto:bg@eastbeam.com]=20
Gesendet: Freitag, 6. August 2004 13:42
An: lucene-user@jakarta.apache.org
Betreff: Lucene internal document number?


hi there,
i looked around through the source but i dont get it. i also read the=20
faq and i know that numbers are incremental for each index and start by=20
0 and change when optimizing and so one...

i looked at the doc writers in lucene, but i dont get the point where=20
numbers are given and written (i assume by using writeVInt() or=20
something like that).

it would be very kind if anyone can tell me what line in which file i=20
had to look for.

thanks in andvance and kind regards from berlin, germany.

bastian

--=20
Mit freundlichem Gru=DF,
Bastian Grimm


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