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From Robert Muir <>
Subject Re: SolrJ and Solr on different java versions
Date Sun, 10 Jun 2012 11:59:37 GMT
There is a text file explaining this: JRE_VERSION_MIGRATION.txt

here is a link to the one from the latest nightly build:

On Sun, Jun 10, 2012 at 6:36 AM, Shawn Heisey <> wrote:
> 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 mind.
> Thanks,
> Shawn
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