On 1/28/2015 2:51 PM, Joshi, Shital wrote: > Thank you for replying. > > We added new shard to same cluster where some shards are showing Solr version > 4.10.0 and this new shard is showing Solr version 4.8.0. All shards source > Solr software from same location and use same start up script. I am surprised > how older shards are still running Solr 4.10.0. > > How we do real downgrade index to 4.8? You mean replay all data?
It is often not enough to simply replace the solr war. You may also need to wipe out the extracted war before restarting, or jars from the previous version may still exist and some of them might be loaded instead of the new version. If you're using the jetty included in the example, the war is in the webapps directory and the extracted files are under solr-webapp. If you're using another container, then I have no idea where the war gets extracted. If any index segments were written by the 4.10 version, they will not be readable after downgrading to the 4.8 version. Wiping out the index and rebuilding it from scratch is usually the only way to fix that situation. Thanks, Shawn
