[infinispan-dev] ISPN-2314 fix looks fishy

Mircea Markus mircea.markus at jboss.com
Wed Sep 19 07:02:42 EDT 2012


On 19 Sep 2012, at 12:57, Manik Surtani wrote:

>> 
>> Hi guys,
>> 
>> Having briefly investigated https://issues.jboss.org/browse/ISPN-2314, I consider the fix (https://github.com/infinispan/infinispan/pull/1318) to be rather fishy.
>> 
>> Sure it works, but it masks the fact that the order in which things are started has changed (This IMO seems to be the result of http://issues.jboss.org/browse/ISPN-2256). 
>> 
>> Not only that, but the fact that you have to modify both the component registry and the configuration makes me think that there're situations where the configuration changes are applied, and others where it's not (hence why you have to change the component registry).
>> 
>> So, can we please stop and try to understand what really is happening here? I was expecting Mircea to have a look into a fix for this since it looks related to cache start order.
>> 
>> Personally, I don't really see why the lifecycle manager has to mess up with the component registry. Changes to the configuration were 'enough' (until 2256) and I don't see why that should change.
> 
> It appears that the cache is already constructed when the cache starting callback is issued.  This means any changes to the configuration at this point won't have any effect.  But changing the configuration is still necessary to allow for restarts.

The cacheStartingCallback was being invoked from two places:
- when the cache was first created from InternalCacheFactory
- on subsequent  re-starts from ComponentRegistry.start() 

As the same call happened at different stages of initialisation I've only kept the 2nd call for consistency. 

Cheers,
-- 
Mircea Markus
Infinispan lead (www.infinispan.org)




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