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From Shawn Heisey <s...@elyograg.org>
Subject Re: Different Solr versions in Solrcloud
Date Tue, 03 Jun 2014 13:17:56 GMT
On 6/3/2014 6:18 AM, Martin de Vries wrote:
> I have two questions about upgrading Solr:
> 
> - We upgrade Solr often, to match the latest version. We have a number
> of servers in a Solrcloud and prefer to upgrade one or two servers first
> and upgrade the other server a few weeks later when we are sure
> everything is stable. Is this the recommended way? Can Solr run
> different versions next to each other in a cloud?

Solr is usually able to have slightly different versions working
together, but I don't know that I would recommend running for a few
weeks in that configuration.  In the context of SolrCloud, sometimes
changes to the data structures in zookeeper are required, which likely
will not work with a previous release.  If you do find that they will
work together, you can continue to do what you've been doing ... but you
do need to be on the lookout for clusterstate format changes and
possible interoperability bugs in the previous release.

> - Do we need to adjust the luceneMatchVersion with every upgrade and do
> we need a reindex after every upgrade? (it takes a lot of time to
> reindex all cores)

This is always recommended, but you can leave luceneMatchVersion alone
and run with your existing index until such time as you are ready to
re-index.  Note that as soon as you index anything at all (or optimize
your index), at least part of your index may be in a new index format,
so going back to the previous version with the existing index may not be
possible.

Thanks,
Shawn


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