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Posted to user@lucy.apache.org by Eneko Agirre <e....@ehu.es> on 2011/08/02 01:25:08 UTC
[lucy-user] lucene 3.0.3
Hi all,
I'm new to lucene and lucy, and would like to use an preexisting index built using lucene 3.0.3.
the index folder looks like this:
-rw-r--r-- 1 jipagbee jipagbee 29942076619 2011-08-01 03:21 _0.cfx
-rw-r--r-- 1 jipagbee jipagbee 16430943173 2011-07-30 03:33 _1tc.cfs
-rw-r--r-- 1 jipagbee jipagbee 294 2011-08-01 03:21 segments_2
-rw-r--r-- 1 jipagbee jipagbee 20 2011-08-01 03:21 segments.gen
when I try to open the folder with lucy's indexreader I get the following:
Index doesn't seem to contain any data
lucy_IxReader_do_open at ../core/Lucy/Index/IndexReader.c line 41
Is there anything I can do to open that index with lucy, or is this a version mismatch problem?
thanks
eneko
--
Eneko Agirre
Euskal Herriko Unibertsitatea
University of the Basque Country
http://ixa2.si.ehu.es/eneko
Re: [lucy-user] lucene 3.0.3
Posted by Marvin Humphrey <ma...@rectangular.com>.
On Tue, Aug 02, 2011 at 09:42:08AM -0700, Eneko Agirre wrote:
> do any of you know of other Perl modules for using indexes created with
> lucene 3.0.3 or newer?
AFAIK, you have to go through a REST interface, as provided by Solr,
ElasticSearch, etc. For local access to Lucene indexes, there is a CPAN
distro last updated in 2007, confusing named "Lucene", which actually wraps
CLucene, the C++ port of Lucene -- but CLucene does not yet offer
compatibility with Lucene 3.x.
Lucene's file format is quasi-documented, but practially speaking, it's
private. It is so aggressively optimized, and it changes so frequently and so
dramatically that it is unrealistic for any library not derived from Java
Lucene line-by-line to keep up.
I believe that the only library other than the direct derivatives of Lucene
which has achieved compatibility with Lucene indexes was KinoSearch, the code
base that has now become Lucy. KinoSearch 0.05 managed compatibility with
Lucene 1.9 indexes back in 2006 -- but that was only for pure ASCII corpus
data and with no incremental indexing support. :) We broke compatibility in
0.06 and have not looked back.
Marvin Humphrey
Re: [lucy-user] lucene 3.0.3
Posted by Eneko Agirre <e....@ehu.es>.
thanks marvin, and sorry to have missed that part of the faq.
do any of you know of other Perl modules for using indexes created with lucene 3.0.3 or newer?
thanks for the help!
eneko
On 08/01/2011 11:14 PM, Marvin Humphrey wrote:
> On Mon, Aug 01, 2011 at 04:25:08PM -0700, Eneko Agirre wrote:
>> I'm new to lucene and lucy, and would like to use an preexisting index built
>> using lucene 3.0.3.
> I'm afraid that won't work:
>
> http://incubator.apache.org/lucy/faq.html
>
> Q. Are Lucy and Lucene compatible?
>
> A. No. Lucy is a "loose" port of Lucene designed to take full advantage of
> C's unique feature set, rather than a line-by-line translation from Java.
> The two libraries are not compatible in terms of either file format or
> API, and there are no plans to establish such compatibility.
>
> Regards,
>
> Marvin Humphrey
>
--
Eneko Agirre
Euskal Herriko Unibertsitatea
University of the Basque Country
http://ixa2.si.ehu.es/eneko
Re: [lucy-user] lucene 3.0.3
Posted by Marvin Humphrey <ma...@rectangular.com>.
On Mon, Aug 01, 2011 at 04:25:08PM -0700, Eneko Agirre wrote:
> I'm new to lucene and lucy, and would like to use an preexisting index built
> using lucene 3.0.3.
I'm afraid that won't work:
http://incubator.apache.org/lucy/faq.html
Q. Are Lucy and Lucene compatible?
A. No. Lucy is a "loose" port of Lucene designed to take full advantage of
C's unique feature set, rather than a line-by-line translation from Java.
The two libraries are not compatible in terms of either file format or
API, and there are no plans to establish such compatibility.
Regards,
Marvin Humphrey