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From Michael Della Bitta <>
Subject Re: Upgrade from solr 4.4 to 4.10.1
Date Thu, 02 Oct 2014 16:14:50 GMT
You should of course perform a test first to be sure, but you shouldn't
need to reindex. Running an optimize on your cores or collections will
upgrade them to the new format, or you could use Lucene's IndexUpgrader
tool. In the meantime, bringing up your data in 4.10.1 will work, it just
won't take advantage of some of the file format improvements.

However, it is somewhat of a design smell that you can't reindex. In my
experience, it is extremely valuable to be able to reindex your data at

Michael Della Bitta

Senior Software Engineer

o: +1 646 532 3062

appinions inc.

“The Science of Influence Marketing”

18 East 41st Street

New York, NY 10017

t: @appinions <> | g+:
w: <>

On Thu, Oct 2, 2014 at 12:06 PM, Grainne <> wrote:

> I need to upgrade from Solr 4.4 to version 4.10.1 and am not sure if I need
> to reindex.
> The following from leads me to
> believe I
> don't:
> "The guarantee for this alpha release is that the index format will be the
> 4.0 index format, supported through the 5.x series of Lucene/Solr, unless
> there is a critical bug (e.g. that would cause index corruption) that would
> prevent this."
> I've been looking through the change logs and news and the following from
> makes me think that maybe I do
> need to reindex:
> "Solr 4.6 Release Highlights:
> ...
> New default index format: Lucene46Codec
> ..."
> It will not be an easy task to reindex the files so I am hoping the answer
> is that it is not necessary.
> Thanks for any advice,
> Grainne
> --
> View this message in context:
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