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From "Uwe Schindler" <...@thetaphi.de>
Subject RE: Lucene 2.x to 4.x upgrade possible?
Date Wed, 18 Jul 2012 09:16:41 GMT
The tool docs can be found here: http://goo.gl/TbbxC

-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: uwe@thetaphi.de


> -----Original Message-----
> From: Uwe Schindler [mailto:uwe@thetaphi.de]
> Sent: Wednesday, July 18, 2012 11:13 AM
> To: java-user@lucene.apache.org
> Subject: RE: Lucene 2.x to 4.x upgrade possible?
> 
> Hi,
> 
> You have to first "convert" your indexes with version 3.x to migrate from
2.x to
> 4.0. This can be done with the new tool called "IndexUpgrader"
> (available since Lucene 3.2 or like that). You can call it from command
line, it
> will upgrade all index segments to the latest version you are using to
call this
> tool. You might want to ship your product with a Lucene 3.6.x
lucene-core.jar
> file just to call the IndexUpgrader tool.
> 
> If you are starting development, I would now use Lucene 4.0-ALPHA. The
final
> version will come out when you finish your product. As the API changed
> completely (2 times 2.x->3.x, 3.x->4.0) it's better to not do the work two
times.
> 
> Uwe
> 
> -----
> Uwe Schindler
> H.-H.-Meier-Allee 63, D-28213 Bremen
> http://www.thetaphi.de
> eMail: uwe@thetaphi.de
> 
> 
> > -----Original Message-----
> > From: Nilesh Vijaywargiay [mailto:nilesh.vijay@gmail.com]
> > Sent: Tuesday, July 17, 2012 11:14 PM
> > To: java-user@lucene.apache.org
> > Subject: Lucene 2.x to 4.x upgrade possible?
> >
> > Hi Folks,
> >
> > I need your help in determining whether we upgrade to 3.6 or wait till
> > 4.0 becomes stable.
> >
> > We are currently using 2.x version of lucene and would like to upgrade
> > to 3.6(and 4.0 ultimately). But we were informed by few blogs that 4.0
> > will
> not be
> > backward compatible which means that the our customers who currently
> > have 2.x will not be able to upgrade to our latest release which would
> > have
> 4.0.
> >
> > Another blog mentioned that people using 2.x and looking upgrade to
> > 4.0 should wait till 4.0 becomes stable. We are kind of confused with
> contracting
> > thoughts here. Does it mean that 4.0 ALPHA doesn't support backward
> > compatibility and recommendation is to use 4.0 stable for backward
> > compatiblity?
> >
> > Basically, to embark on process of upgrading lucene to 3.6(and 4.0
> > later) depends on whether customer having 2.x can upgrade to 4.0 or not.
> >
> > Thanks
> 
> 
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