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From Shawn Heisey <>
Subject Re: upgrading from Solr 3.5 to Solr 4.X
Date Wed, 02 Oct 2013 15:12:20 GMT
On 10/2/2013 1:08 AM, subacini Arunkumar wrote:
> We are planning to upgrade from Solr 3.5 to Solr 4.x version. Appreciate if
> you can provide any pointers/documentation on step by step by changes.
> Also, the reason for upgrading is to use Solr join [not solr cloud or any
> other feature]. So which version is better Solr 4.0 or higher version
> considering the changes to be minimal during upgradation.

When it comes to open source software, it's usually best to run the
latest version.  If there's a major problem with a particular release,
it will be *QUICKLY* followed by a point release to fix those problems,
or a workaround will be prominently posted.  When new releases happen
after that, it's best to start testing with it right away and upgrade
your production install as soon as you feel comfortable with it.  If the
latest version just came out, you might want to start with one version
back, but plan on upgrading to the latest version quickly afterwards.

The 4.0.0 release came out on October 12, 2012.  That's one year ago.
There have been six releases since then, and a seventh (4.5.0) is days
from announcement.

Every release comes with a CHANGES.txt file, where individual issues are
listed and important upgrade notes are given.  It's also a good idea to
compare the example config/schema from the version you're running to the
example config/schema in the new version in order to see what has
changed there, for clues about how you might want to change your own

When upgrading major releases, it is probably a good idea to start with
the example config/schema and make changes until it does what you need.
 It's also a *very* good idea to build up a complete system in a dev
environment so you can run extensive tests without making any changes to
your production setup.

Finally, stay subscribed to this mailing list, the user list.  Typical
problems and bugs are very likely to be discussed here.  If you want to
get down and dirty and don't mind a lot of email traffic, you can also
join the dev list.


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