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 will. 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 <https://twitter.com/Appinions> | g+: plus.google.com/appinions <https://plus.google.com/u/0/b/112002776285509593336/112002776285509593336/posts> w: appinions.com <http://www.appinions.com/> On Thu, Oct 2, 2014 at 12:06 PM, Grainne <grainne_rei...@harvard.edu> 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 http://wiki.apache.org/solr/Solr4.0 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 > http://lucene.apache.org/solr/solrnews.html 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: > http://lucene.472066.n3.nabble.com/Upgrade-from-solr-4-4-to-4-10-1-tp4162340.html > Sent from the Solr - User mailing list archive at Nabble.com. >
