I ran the command and got the following output. Despite the error message, 
I restarted memcached and apache2 and went to the site. Instead of the big 
django explosion I got before, I now see the "Review Board is taking a nap" 
message.

~# rb-site manage /var/lib/reviewboard evolve -- --hint --execute

You have requested a database evolution. This will alter tables
and data currently in the 'default' database, and may result in
IRREVERSABLE DATA LOSS. Evolutions should be *thoroughly* reviewed
prior to execution.

Are you sure you want to execute the evolutions?

Type 'yes' to continue, or 'no' to cancel: yes
Error: Error applying evolution: (1060, "Duplicate column name 
'diff_base64'")

On Monday, April 8, 2013 2:38:08 PM UTC-4, Christian Hammond wrote:
>
> Sorry about that.. We hit some rough bugs in Django Evolution (or rather, 
> introduced scenarios it wasn't prepared for), but I do think that going 
> forward, these issues should be mostly gone.
>
> So I don't normally advise this, but here's what I'd recommend in this 
> case:
>
> 1) Back up your database
> 2) Run: rb-site manage /path/to/site evolve -- --hint --execute
>
> Clear your memcached and make sure that your review requests are still 
> working properly.
>
> The --hint --execute tells Django Evolution to just make the database 
> match the current schema. Given the situation here where those should 
> already be in the database, I don't know what it'll do to add them 
> (hopefully just update your schema history). If all fails, you can restore 
> the database backup and we can try again.
>
> Christian
>
> -- 
> Christian Hammond - chi...@chipx86.com <javascript:>
> Review Board - http://www.reviewboard.org
> Beanbag, Inc. - http://www.beanbaginc.com
>
>
> On Mon, Apr 8, 2013 at 11:17 AM, Chris Eagan <cea...@gmail.com<javascript:>
> > wrote:
>
>> Yes, each server used it's own independent database. They exist on fully 
>> distinct virtual machines.
>>
>> This is only the second time this server has been upgraded. The first 
>> upgrade attempt I did today was run with the older version of 
>> django_evolution. That might be why the upgrade wasn't successful and why 
>> some evolutions were already applied. Unfortunately, I was over-confident 
>> and didn't back up the database prior to my upgrade attempt because the 
>> first server had upgraded fine. The first server had the newer version of 
>> django_evolution installed and I failed to check that the second server did 
>> prior to the upgrade.
>>
>> I have a backup of the database after the first upgrade attempt.
>>
>> I did not downgrade or wipe any evolutions.
>>
>> -Chris
>>
>>
>> On Monday, April 8, 2013 2:11:02 PM UTC-4, Christian Hammond wrote:
>>
>>> When you mentioned different servers, were these each with their own 
>>> database?
>>>
>>> It's complaining about fields that already existed in 1.6.11, which 
>>> shouldn't be correct. It's also showing that those evolutions were already 
>>> applied.
>>>
>>> At any point did you ever downgrade or wipe an evolution?
>>>
>>> Christian
>>>
>>>
>>> On Apr 8, 2013, at 10:59, Chris Eagan <cea...@gmail.com> wrote:
>>>
>>> I think my last answer was wrong. I tried to upgrade and got this:
>>>
>>> ~# easy_install -U django_evolution
>>> Searching for django-evolution
>>> Reading 
>>> http://downloads.reviewboard.**org/releases/ReviewBoard/1.6/<http://downloads.reviewboard.org/releases/ReviewBoard/1.6/>
>>> Reading 
>>> http://pypi.python.org/simple/**django_evolution/<http://pypi.python.org/simple/django_evolution/>
>>> Reading 
>>> http://code.google.com/p/**django-evolution/<http://code.google.com/p/django-evolution/>
>>> Best match: django-evolution 0.6.9
>>> Processing django_evolution-0.6.9-py2.6.**egg
>>> django-evolution 0.6.9 is already the active version in easy-install.pth
>>>
>>> Using /usr/local/lib/python2.6/dist-**packages/django_evolution-0.6.**
>>> 9-py2.6.egg
>>> Processing dependencies for django-evolution
>>> Finished processing dependencies for django-evolution
>>>
>>> On Monday, April 8, 2013 1:57:20 PM UTC-4, Christian Hammond wrote:
>>>>
>>>> Try upgrading to 0.6.9. There were a lot of fixes that went in since 
>>>> your version.
>>>>
>>>> Christian
>>>>
>>>>
>>>> On Apr 8, 2013, at 10:53, Chris Eagan <cea...@gmail.com> wrote:
>>>>
>>>> 0.6.7-py2.6
>>>>
>>>> On Monday, April 8, 2013 1:46:57 PM UTC-4, Christian Hammond wrote:
>>>>>
>>>>> Hi Chris,
>>>>>
>>>>> What version of the django_evolution module is installed?
>>>>>
>>>>> Christian
>>>>>
>>>>> -- 
>>>>> Christian Hammond - chi...@chipx86.com
>>>>> Review Board - http://www.reviewboard.org
>>>>> Beanbag, Inc. - http://www.beanbaginc.com
>>>>>  
>>>>>
>>>>> On Mon, Apr 8, 2013 at 8:35 AM, Chris Eagan <cea...@gmail.com> wrote:
>>>>>
>>>>>> I attempted to perfom an upgrade of one of our ReviewBoard 
>>>>>> installations and I have run into a problem. The first server upgraded 
>>>>>> fine, but this one is not working. I folloed some of the recommendations 
>>>>>> in 
>>>>>> another post, but I was not successful. Thank you for any help you can 
>>>>>> provide.****
>>>>>>
>>>>>> ** **
>>>>>>
>>>>>> ~$ sudo rb-site upgrade /var/lib/reviewboard****
>>>>>>
>>>>>> Rebuilding directory structure****
>>>>>>
>>>>>> Upgrading site settings_local.py****
>>>>>>
>>>>>> Updating database. This may take a while.****
>>>>>>
>>>>>> ** **
>>>>>>
>>>>>> The log output below, including warnings and errors,****
>>>>>>
>>>>>> can be ignored unless upgrade fails.****
>>>>>>
>>>>>> ** **
>>>>>>
>>>>>> ------------------ <begin log output> ------------------****
>>>>>>
>>>>>> Creating tables ...****
>>>>>>
>>>>>> Creating table extensions_registeredextension****
>>>>>>
>>>>>> Creating table diffviewer_filediffdata****
>>>>>>
>>>>>> Upgrading Review Board from 1.6.11 to 1.7.6****
>>>>>>
>>>>>> There are unapplied evolutions for auth.****
>>>>>>
>>>>>> There are unapplied evolutions for accounts.****
>>>>>>
>>>>>> There are unapplied evolutions for diffviewer.****
>>>>>>
>>>>>> There are unapplied evolutions for reviews.****
>>>>>>
>>>>>> Adding baseline version for new models****
>>>>>>
>>>>>> Project signature has changed - an evolution is required****
>>>>>>
>>>>>> Installing custom SQL ...****
>>>>>>
>>>>>> Installing indexes ...****
>>>>>>
>>>>>> Installed 0 object(s) from 0 fixture(s)****
>>>>>>
>>>>>> *The stored evolutions do not completely resolve all model changes.*
>>>>>>
>>>>>> Run `./manage.py evolve --hint` to see a suggestion for the changes 
>>>>>> required.****
>>>>>>
>>>>>> ** **
>>>>>>
>>>>>> The following are the changes that could not be resolved:****
>>>>>>
>>>>>> In model scmtools.Repository:****
>>>>>>
>>>>>>     Field 'extra_data' has been added****
>>>>>>
>>>>>>     Field 'hosting_account' has been added****
>>>>>>
>>>>>> *Error: Your models contain changes that Django Evolution cannot 
>>>>>> resolve automati*                      **
>>>>>>                               **               *cally.*
>>>>>>
>>>>>> ~$ sudo -i****
>>>>>>
>>>>>> ~# mysqldump -p reviewboard > reviewboard.sql****
>>>>>>
>>>>>> ~# rb-site manage /var/lib/reviewboard dumpdata django_evolution > 
>>>>>> django_evolution.json****
>>>>>>
>>>>>> ~# sudo easy_install -U django_evolution****
>>>>>>
>>>>>> ~# rb-site manage /var/lib/reviewboard list-evolutions****
>>>>>>
>>>>>> Applied evolutions for 'sessions':****
>>>>>>
>>>>>>     session_expire_date_db_index****
>>>>>>
>>>>>> ** **
>>>>>>
>>>>>> Applied evolutions for 'accounts':****
>>>>>>
>>>>>>     is_private****
>>>>>>
>>>>>> ** **
>>>>>>
>>>>>> Applied evolutions for 'changedescs':****
>>>>>>
>>>>>>     fields_changed_longtext****
>>>>>>
>>>>>> ** **
>>>>>>
>>>>>> Applied evolutions for 'diffviewer':****
>>>>>>
>>>>>>     add_parent_diffs****
>>>>>>
>>>>>>     filediff_filenames_1024_chars****
>>>>>>
>>>>>>     diffset_basedir****
>>>>>>
>>>>>>     filediff_status****
>>>>>>
>>>>>> ** **
>>>>>>
>>>>>> Applied evolutions for 'reviews':****
>>>>>>
>>>>>>     change_descriptions****
>>>>>>
>>>>>>     last_review_timestamp****
>>>>>>
>>>>>>     shipit_count****
>>>>>>
>>>>>>     default_reviewer_repositories****
>>>>>>
>>>>>>     null_repository****
>>>>>>
>>>>>>     localsite****
>>>>>>
>>>>>>     group_incoming_request_count****
>>>>>>
>>>>>>     group_invite_only****
>>>>>>
>>>>>>     group_visible****
>>>>>>
>>>>>>     default_reviewer_local_site****
>>>>>>
>>>>>>     add_issues_to_comments****
>>>>>>
>>>>>>     file_attachments****
>>>>>>
>>>>>> ** **
>>>>>>
>>>>>> Applied evolutions for 'scmtools':****
>>>>>>
>>>>>>     bugzilla_url_charfield****
>>>>>>
>>>>>>     repository_raw_file_url****
>>>>>>
>>>>>>     repository_visible****
>>>>>>
>>>>>>     repository_path_length_255****
>>>>>>
>>>>>>     localsite****
>>>>>>
>>>>>>     repository_access_control****
>>>>>>
>>>>>>     group_site****
>>>>>>
>>>>>>     repository_hosting_accounts****
>>>>>>
>>>>>>     repository_extra_data_null****
>>>>>>
>>>>>> ** **
>>>>>>
>>>>>> ~# rb-site manage /var/lib/reviewboard shell****
>>>>>>
>>>>>> Python 2.6.5 (r265:79063, Oct  1 2012, 22:04:36)****
>>>>>>
>>>>>> [GCC 4.4.3] on linux2****
>>>>>>
>>>>>> Type "help", "copyright", "credits" or "license" for more information.
>>>>>> ****
>>>>>>
>>>>>> (InteractiveConsole)****
>>>>>>
>>>>>> >>> exit()****
>>>>>>
>>>>>> ~# rb-site upgrade /var/lib/reviewboard****
>>>>>>
>>>>>> Rebuilding directory structure****
>>>>>>
>>>>>> Updating database. This may take a while.****
>>>>>>
>>>>>> ** **
>>>>>>
>>>>>> The log output below, including warnings and errors,****
>>>>>>
>>>>>> can be ignored unless upgrade fails.****
>>>>>>
>>>>>> ** **
>>>>>>
>>>>>> ------------------ <begin log output> ------------------****
>>>>>>
>>>>>> Creating tables ...****
>>>>>>
>>>>>> There are unapplied evolutions for auth.****
>>>>>>
>>>>>> There are unapplied evolutions for accounts.****
>>>>>>
>>>>>> There are unapplied evolutions for diffviewer.****
>>>>>>
>>>>>> There are unapplied evolutions for reviews.****
>>>>>>
>>>>>> Project signature has changed - an evolution is required****
>>>>>>
>>>>>> Installing custom SQL ...****
>>>>>>
>>>>>> Installing indexes ...****
>>>>>>
>>>>>> Installed 0 object(s) from 0 fixture(s)****
>>>>>>
>>>>>> *The stored evolutions do not completely resolve all model changes.*
>>>>>>
>>>>>> Run `./manage.py evolve --hint` to see a suggestion for the changes 
>>>>>> required.****
>>>>>>
>>>>>> ** **
>>>>>>
>>>>>> The following are the changes that could not be resolved:****
>>>>>>
>>>>>> In model scmtools.Repository:****
>>>>>>
>>>>>>     Field 'extra_data' has been added****
>>>>>>
>>>>>>     Field 'hosting_account' has been added****
>>>>>>
>>>>>> *Error: Your models contain changes that Django Evolution cannot 
>>>>>> resolve automatically.*
>>>>>>
>>>>>> ** **
>>>>>>
>>>>>> -Chris Eagan****
>>>>>>
>>>>>> ** **
>>>>>>
>>>>>> -- 
>>>>>> Want to help the Review Board project? Donate today at 
>>>>>> http://www.reviewboard.org/**donate/<http://www.reviewboard.org/donate/>
>>>>>> Happy user? Let us know at 
>>>>>> http://www.reviewboard.org/**users/<http://www.reviewboard.org/users/>
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>>>>>> group/reviewboard?hl=en<http://groups.google.com/group/reviewboard?hl=en>
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>>>>>> .
>>>>>>  
>>>>>>  
>>>>>>
>>>>>
>>>>>  -- 
>>>> Want to help the Review Board project? Donate today at 
>>>> http://www.reviewboard.org/**donate/<http://www.reviewboard.org/donate/>
>>>> Happy user? Let us know at 
>>>> http://www.reviewboard.org/**users/<http://www.reviewboard.org/users/>
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>>>>  
>>>>
>>>>  -- 
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>>>
>>>
>

-- 
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