I think it highly depends on how you want to do it. You could continue to run 4.6 and have another instance(a) with 8.2+. Then you just Index as you used to do it until now on the new one. Once you have all the data indexed you switch you lt application to 8.2. Of course you need to test it in dev, test etc environments. Maybe in order to reduce time for the future and it you don’t use a database import. Convert your “rich” documents (eg pdf, wird, excel) in a suitable text format (or html) and start indexing from there. This will save you a lot of time on converting those documents in case of reindexing.
Then depending on the use case it could be also worthy to think about not indexing anymore old data (=> datensparsamkeit). > Am 01.10.2019 um 23:19 schrieb Jyothsna Bavisetti > <jyothsna.bavise...@oracle.com>: > > Hi Shawn, > > Any doc or links for re indexing process. We are using Lucene core 8.0.0. > > > Thanks, > Jyothsna > > -----Original Message----- > From: Jyothsna Bavisetti > Sent: Thursday, September 26, 2019 11:51 PM > To: dev@lucene.apache.org > Subject: RE: Lucene index upgrade from 4.6 to 8 facing issue > > Hi Shawn, > > Re-indexing is costly transaction in my use case as it takes more than three > days. Please let me know if any work around? > > Thanks, > Jyothsna > -----Original Message----- > From: Shawn Heisey <elyog...@elyograg.org> > Sent: Thursday, September 26, 2019 11:35 PM > To: dev@lucene.apache.org > Subject: Re: Lucene index upgrade from 4.6 to 8 facing issue > >> On 9/26/2019 11:41 AM, Jyothsna Bavisetti wrote: >> I am trying to upgrade Lucene index from 4.6 to 8.0.0. When I'm trying >> to upgrade tool using: >> >> java -cp lucene-core.jar:lucene-backward-codecs.jar \ >> >> org.apache.lucene.index.IndexUpgrader-delete-prior-commits \ > > <snip> > >> Please let me know any option other than reindexing. > > If you're upgrading more than one major version, you must reindex. > Multiple major version upgrades have always been discouraged and never > guaranteed to work, but now such upgrades are explicitly denied. > > When you used the IndexUpgrader from Lucene 6, the Lucene version was written > into the index. The recorded version was preserved by the upgrader for > version 7. When the index was subsequently read by version 8, it complained > because the original index was not written by version 7 or later. > > Thanks, > Shawn > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional > commands, e-mail: dev-h...@lucene.apache.org > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org > For additional commands, e-mail: dev-h...@lucene.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org
