[jboss-as7-dev] Intended deployemnt behavior?

[Brian Stansberry]

On 7/11/11 11:15 AM, Jason T. Greene wrote:
> On 7/11/11 11:11 AM, Brian Stansberry wrote:
>> On 7/11/11 10:00 AM, Jason T. Greene wrote:
>>> On 7/11/11 9:41 AM, Max Rydahl Andersen wrote:
>>>> Brian,
>>>>
>>>>> This is merged (thanks!) along with a fix such that deleting the
>>>>> deployment content triggers undeploy[1].
>>>>>
>>>>> [1] https://issues.jboss.org/browse/AS7-1240
>>>>
>>>> For clarification - does this "undeploy on deleted content" only apply
>>>> to zipped archives
>>>> or will it also happen for exploded ?
>>>>
>>>> And I assume deleting the .deploy will work in any case?
>>>>
>>>
>>> It only applies to things which have auto-deploy turned on. So not by
>>> default for exploded.
>>
>> Not true; it happens whether or not auto-deploy is on. I suppose that's
>> not consistent, although it is less convoluted to explain. I'll look at
>> how big of a pain it would be to make it only happen when auto-deploy is
>> on.
>>
>> Note that the trigger for undeploy is not the deletion of any file
>> inside the exploded deployment. You have to delete the entire directory.
>>
>> Although you could turn it on and get russian
>>> roulette deployment. The biggest problem being that frameworks are
>>> surprised when their content disappears before being shutdown. This isnt
>>> an issue for archives because we make a copy.
>>>
>>
>> Enabling deletion of exploded content as a trigger for undeploy doesn't
>> make it russian roulette. Deleting the content without undeploying first
>> is what's russian roulette, whether or not the AS decides to undeploy
>> after you do that. Auto-undeploying is like playing with a gun with more
>> cylinders; still a bad idea but maybe we undeploy before your app takes
>> a user request that blows up in weird and wonderful ways.
>
> Sure but enabling auto-deploy for exploded is russian roulette in
> general since absent an atomic move, it's a race between the scanner
> noticing and the copy operation.
>

True. Seems we're going back and forth expanding on the russian-roulette 
nature of not using the marker files with an exploded deployment. :-)

-- 
Brian Stansberry
Principal Software Engineer
JBoss by Red Hat