Hi Uwe,
On 4/13/2010 2:23 AM, Uwe Schindler wrote:
As of Lucene 3.0, WhitespaceAnalyzer has not yet a Version ctor. It will come
in 3.1, when Lucene is changed to be Unicode 4.0 conform (3.0 and before is
Unicode 3.0, which is Java 1.4).
QueryParser need the Version ctor for the handling of stop words. As WhiteSpace
Analyzer does not use StopFilter, there was no need for a version ctor.
QueryParser will pass the version not to the analyzer, it will use it solely for
its own behavior. But you should use the same version for QP and your Analyzer. If
one of the components has no Version, there is no incompatible change (in fact,
Whitespace Analyzer was not changed). Please also read the document about moving
from Java 1.4 to Java 5/6 in the Lucene ZIP file (if you already used Java 5/6
with older Lucene versions before, all is fine - reindexing may only required if
you move your JVM installation from 1.4 -> 5/6; independent from Lucene's
version).
We are using java 1.6, so that part is covered.
Another thing is, do we need to re-index if we want to supply
Version.LUCENE_CURRENT as the version? what are other implications?
Yes! And please, please: Don't use Version.LUCENE_CURRENT (which is already
deprecated as of Lucene 2.9.2 and 3.0.1 as a warning). Use a specific version,
so you will never need to reindex until you change the version.
To have backwards compatibility with existing indexes from pre-2.9 without
reindexing use LUCENE_24.
We are using Lucene 2.9.2 now but planning to move to version 3 in near
future. I am a little confused about this version stuff and how you
have to re-index if you want to use a newer version. In past, all you
had to do, is to add one document to index using new version and the
index used to get converted to that format automatically, is it not the
case now? If that is not the case, then this might be very difficult for
us to handle because we have over 500+ indexes and re-indexing all of
them is a huge task for us.
One more question, we use LUCENE_29 for now and in near future want to
move to LUCENE_30. Will the queryparsers/analyzers opened with
LUCENE_30 be able to read indexes created by using LUCENE_29?
Uwe
-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: u...@thetaphi.de
-----Original Message-----
From: Siraj Haider [mailto:si...@jobdiva.com]
Sent: Monday, April 12, 2010 11:14 PM
To: java-user@lucene.apache.org
Subject: WhitespaceAnalyzer and version
We are in the process of removing the deprecated api from our code to
move to version. One of the deprecation is, the queryparser now
expects
a version parameter in the constructor. I also have read somewhere
that
we should pass the same version to analyzer when indexing as wel as
when
searching. We use WhitespaceAnalyzer and I am unable to find a
constructor with a version in it.
Another thing is, do we need to re-index if we want to supply
Version.LUCENE_CURRENT as the version? what are other implications?
thanks
-siraj
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