I have added a QnA
https://cwiki.apache.org/confluence/display/LUCENE/LuceneFAQ#LuceneFAQ-WhenIupradeLucene,forexamplefrom8.8.2to9.0.0,doIhavetoreindex?
Hope that makes sense, otherwise let me know and I can correct/update :-)
Am 26.05.21 um 23:56 schrieb Michael Wechner:
using lucene-backward-codecs-9.0.0-SNAPSHOT.jar makes it work :-)
Thank you very much!
But IIUC it is recommended to reindex when upgrading, right? I guess
similar to what Solr is recommending
https://solr.apache.org/guide/8_0/reindexing.html
Am 26.05.21 um 21:26 schrieb Michael Sokolov:
I think you need backward-codecs-9.0.0-SNAPSHOT there. It enables 9.0
to read 8.x indexes.
On Wed, May 26, 2021 at 9:27 AM Michael Wechner
<michael.wech...@wyona.com> wrote:
Hi
I am using Lucene 8.8.2 in production and I am currently doing some
tests using 9.0.0-SNAPSHOT, whereas I have included
lucene-backward-codecs, because in the log files it was asking me
whether I have forgotten to include lucene-backward-codecs.jar
<dependency>
<groupId>org.apache.lucene</groupId>
<artifactId>lucene-core</artifactId>
<version>9.0.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.apache.lucene</groupId>
<artifactId>lucene-queryparser</artifactId>
<version>9.0.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.apache.lucene</groupId>
<artifactId>lucene-backward-codecs</artifactId>
<version>8.8.2</version>
</dependency>
But when querying index directories created with Lucene 8.8.2, then I
receive the following error
java.lang.NoClassDefFoundError: Could not initialize class
org.apache.lucene.codecs.Codec$Holder
I am not sure whether I understand the backwards compatibility page
correctly
https://cwiki.apache.org/confluence/display/LUCENE/BackwardsCompatibility
but I guess version 9 will not be backwards compatible to version 8? Or
should I do something different?
Thanks
Michael
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