topic Re: Lucene over SOLR in Alfresco Forum

Lucene over SOLR

espressobeanies — Tue, 19 Dec 2017 15:41:01 GMT

I'm running an older version of Alfresco CE and I wanted to ask what the difference between specifying the 'index.subsystem.name' property as 'lucene' over 'solr'. Some instructions I found from an error message I had mentioned at the end to perform a full index recovery and set the following variab

Re: Lucene over SOLR

andy1 — Fri, 05 Jan 2018 11:09:08 GMT

Changing to lucene has no advantage - it was deprecated/replaced for good reasons. The main thing it gave was transactional queries in a non-clustered set up - which you can now do with transactional metadata query. There is only an advantage if you already have a lucene index from previous versions and you want to migrate.

Some developers like lucene as they can spin up everything via spring for testing etc., as there is no dependency on a SOLR web app.

Andy

Re: Lucene over SOLR

espressobeanies — Fri, 12 Jan 2018 18:41:37 GMT

Thanks Andy. I didn't realize Solr was built atop Lucene (Apache) and just processes the data differently. Both systems have separate restore methods.

Re: Lucene over SOLR

andy1 — Mon, 15 Jan 2018 10:35:10 GMT

The SOLR and lucene search sub-systems are very different beasts - even though SOLR is built on lucene.

SOLR is an external web (SOLR 1 & SOLR 4) or stand alone application (SOLR 6). Lucene is embedded in the repository for ACS 4 and before. Lucene in ACS was deprecated and only supported for upgrade in ACS 5.

Andy