[infinispan-dev] Why is loading from store needed before storing in cache store?

[Galder Zamarreño]

On Oct 12, 2010, at 6:50 PM, Mircea Markus wrote:

> 
> On 12 Oct 2010, at 15:53, Galder Zamarreño wrote:
> 
>> Hi,
>> 
>> I'd like to list the reasons why we load data from the cache store, if not present in memory, when trying to modify a k/v.
>> 
>> So far, the most powerful one I've found is when you're dealing with cold caches and you need to return previous value. You definitely need to load first to get previous value before modifying.
>> 
>> Now, if this is the only situation, it could be optimised by checking whether unreliableReturnValues is on or not.
> +1
> What about adding a unreliable_Return_Values flag? This would skip both remote lookup and cache store (when possible).

That's the key question, do we need either:

a) Only a SKIP_CACHE_LOAD flag like the one suggested in http://lists.jboss.org/pipermail/infinispan-dev/2010-October/006436.html

b) A wider scope UNRELIABLE_RETURN_VALUES that encompasses both SKIP_CACHE_LOAD functionality and existing SKIP_REMOTE_LOOKUP, keeping SKIP_REMOTE_LOOKUP.

c) We have all 3 flags: UNRELIABLE_RETURN_VALUES (= SCL + SRL), SKIP_CACHE_LOAD and SKIP_REMOTE_LOOKUP

Thoughts?

>> 
>> This is somehow linked with the discussion wrt https://jira.jboss.org/browse/ISPN-693 and the previous email thread for http://lists.jboss.org/pipermail/infinispan-dev/2010-October/006436.html
>> 
>> I can't think of any other situations right now, but it'd be interesting to know whether anyone knows other (Manik, Mircea?)
>> 
>> Any information arising from this thread should be condensed into javadoc for loadIfNeeded method.
>> 
>> Cheers,
>> --
>> Galder Zamarreño
>> Sr. Software Engineer
>> Infinispan, JBoss Cache
>> 
>> 
>> _______________________________________________
>> infinispan-dev mailing list
>> infinispan-dev at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/infinispan-dev
> 
> _______________________________________________
> infinispan-dev mailing list
> infinispan-dev at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/infinispan-dev

--
Galder Zamarreño
Sr. Software Engineer
Infinispan, JBoss Cache