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From Shawn Heisey <>
Subject SolrJ and Solr on different java versions
Date Sun, 10 Jun 2012 10:36:50 GMT
Because Java 6 is going EOL, we plan to upgrade to Java 7 at some point 
in the next few months.  In order to ensure that it goes smoothly, we 
will only update one index at a time.  This means that the SolrJ program 
will be running on a different Java version than one of the indexes, and 
the same version as the other index.  We will also be upgrading the Java 
version on our web servers that also use SolrJ, though that may happen 
on an entirely different schedule.

Are the different Unicode versions between client and server going to be 
an issue?  Should we plan on testing everything behind the scenes and 
then upgrading Java on everything at once (Solr, SolrJ, and the web 
application) rather than trying to phase it in?

The data originates in a MySQL database.  For performance reasons, we 
use DIH to do full rebuilds, but all regular updating is done with 
update requests in SolrJ.  The two indexes are updated independent from 
each other, but it is all done within one running copy of the program.

I asked this question on the user list before, but I don't remember 
seeing an answer.  The recent comment on LUCENE-2073 made it fresh in my 


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