Hi,
Understood, thanks for clearing that up ! Will check the archive for more
discussions on the mentioned parse-order issues.
On Wed, Apr 17, 2013 at 7:03 PM, jcbollinger <john.bollin...@stjude.org>wrote:
>
>
> On Tuesday, April 16, 2013 8:50:08 AM UTC-5, alcy wrote:
>>
>> HI,
>>
>> John, doesn't it have the advantage of a seamless upgrade to puppet 3.0 ?
>> Can you elaborate on why its not advantageous to use explicit hiera calls ?
>>
>
> Read again. I did not recommend against explicit hiera calls; indeed, my
> suggestion relies on them. Rather, I recommended against class
> parameterization. Either solution will work without modification in both
> Puppet 2 (assuming hiera is installed) and Puppet 3, though the
> parameterized version might cause Puppet 3 to perform a redundant lookup
> for each parameter.
>
> I have written extensively in the past on the shortcomings of Puppet
> parameterized classes. To be fair, the problem isn't really with
> parameterized classes themselves, but rather with parameterized-style class
> declarations (i.e. class { 'foo': param1 => 'bar' }; do not confuse those
> with class *definitions*). You should not use them in Puppet 2 or in
> Puppet 3 because they are subject to parse-order issues, and they can
> mislead about what you can and can't do with classes (for example, attempts
> to override class parameters are silently ineffective).
>
> My point is that if you are going to rely exclusively on hiera to bind
> data to your classes, then there is little advantage to using class
> parameter formalism at all. You can just make the erstwhile parameters be
> ordinary class variables, initialized via hiera. This reduces the
> conceptual weight of your classes and enforces their intended mode of use.
>
>
> John
>
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