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From David Jencks <>
Subject Re: User Configuration of ports, etc.
Date Thu, 25 Aug 2005 01:29:23 GMT

On Aug 24, 2005, at 6:10 PM, Dain Sundstrom wrote:

>>>>> Could I add things rather than override?
>>>>     No.  You can do that in the console, but this file just lets you
>>>> override certain attributes for GBeans that are already in the 
>>>> server.
>>>> You'll notice in the sample there aren't full GBean definitions, 
>>>> only what
>>>> amounts to attribute=value entries.
>>> Would anything stop you from doing that though?
>> I would.  The idea here is to allow a few attributes to be customized 
>> locally even on a server with immutable configurations.  editing your 
>> configuration contents should use a different system.  Most 
>> attributes and all references will not be editable in this config db.
> I believe that this strategy is a bad idea.  What is going to happen 
> is every time we release the software, someone is going to want to 
> tweak a setting that we either forgot to make manageable, or we 
> wrongly believed shouldn't be managed.  Why not make all attributes* 
> manageable?

I think perhaps ones point of view on this argument has something to do 
with whether one thinks small versioned binary configurations should be 
the basic unit of distributing and building a server.  If you think 
that versioned binary configurations basically won't work, then there 
is no reason to ever inhibit any editing of any configurations, ever, 
since each server has no discernable relationship to any other server.  
If you think versioned binary configurations are the one true path, 
then you need some way to make sure that the allowed modifications to a 
versioned binary configuration are rather small and don't affect its' 
essential character: otherwise the version stops meaning anything.

Personally I would like to give versioned binary configurations a good 
chance to see if we can make them work: I don't think we have tried 
them yet, and if they can be made to work I think they will be a really 
cool feature.  I would prefer to see "arbitrary edits" take place using 
something like the console or a special tool, and only on unversioned 
mutable configurations.

david jencks

> -dain
> * Of course a user could not set a binary attribute but you get the 
> idea.

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