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[EP-tech] Re: Adding fields to a live system - any data integrity concerns?



Il 21/07/2014 09:51, Andrew Beeken ha scritto:
> Okay, so I take it when Apache is stopped you can still run Perl scripts
> on the server (epadmin etc?)?

sure, because it uses the perl libraries directly and not apache.

>
> On 18/07/2014 16:57, "Sebastien Francois" <sf2 at ecs.soton.ac.uk> wrote:
>
>> Also stop the indexer when you stop apache and restart the indexer when
>> you restart apache.
>>
>> Seb.
>>
>> On 18/07/14 16:49, Jan Ploski wrote:
>>> If you want to do it as a hotfix, the proper procedure would be to
>>> 1. Add expected columns and indexes to database tables
>>> 2. Add the field definition (which depends on 1)
>>> 3. (optional) Run whatever initialization scripts you need to run for
>>> the field
>>> 4. apachectl graceful
>>>
>>> Unfortunately, EPrints tools assume that you add the field definition
>>> first and that they then update the database for you. This leaves a
>>> window of inconsistency during which your users will get errors.
>>>
>>> Obviously, if you don't mind a short service interruption, it's not a
>>> concern and you can do it "offline" during a maintenance window:
>>> 1. apachectl stop
>>> 2. Add field definition
>>> 3. Use epadmin to update database
>>> 4. (optional) Run whatever initialization scripts you need to run for
>>> the field
>>> 5. apachectl start
>>>
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