[jbosscache-dev] JBoss Cache weakness handling heuristic transaction outcomes - [Fwd: [Fwd: New case comment notification. Case Number 00017677]]

[Jonathan Halliday]

The client app will actually get a heuristic exception in 
response to its commit call and should do cleanup in the 
exception handler. However, that's not always going to be 
user code, it may be e.g. the app server's EJB container in 
the case of CMT. Hence if you go down this route, which I 
agree is probably the best approach, other parts of the app 
server may need to be aware of the issues.

Jonathan.

Manik Surtani wrote:
> +1.  So the controlling app - which would typically be a participant in 
> the tx anyway - would react to a STATUS_UNKNOWN by clearing the cache of 
> the nodes involved.  The cache itself just treats STATUS_UNKNOWN as a 
> rollback.
> 
> On 21 Aug 2007, at 19:01, Jason T. Greene wrote:
> 
>> Manik Surtani wrote:
>>> Ok, I just spoke to Steve @ Hibernate on how Hibernate deals with 
>>> this situation.  From an IM conversation:
>>> "that is deemed a failed transaction
>>> anything other than committed"
>>> So Hibernate rolls back STATUS_UNKNOWN as well.  I think this is 
>>> therefore a safe default.
>>> Is there a good reason to try and purge the nodes in such a case?  Or 
>>> just stick with the default above?
>>
>> I think this makes more sense for the cache controlling application to 
>> be responsible for removing data. If you look at the hibernate case it 
>> does stuff outside the realm of the tx boundary anyway 
>> (putForExternalRead). So even if we did auto purge, it's not 
>> guaranteed that we are purging the correct data.
>>
>> -- 
>> Jason T. Greene
>> Lead, POJO Cache
>> JBoss, a division of Red Hat
> 
> -- 
> Manik Surtani
> 
> Lead, JBoss Cache
> JBoss, a division of Red Hat
> 
> 
> 
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