[hibernate-dev] Caching @EmbeddedId/@Embeddable instances

[Steve Ebersole]

FYI, for my own remembrance...

https://hibernate.onjira.com/browse/HHH-6880
https://hibernate.onjira.com/browse/HHH-6822

On Fri 08 Jun 2012 08:30:08 AM CDT, Steve Ebersole wrote:
> I agree. This sounds like the component being serialized as part of
> its inclusion in the CacheKey rather than the component being
> "disassembled".
>
> On Fri 08 Jun 2012 08:18:52 AM CDT, Scott Marlow wrote:
>> I'll be interested to hear which software versions are in use (I just
>> asked in the below forum link).
>>
>> On 06/08/2012 08:01 AM, Galder Zamarreño wrote:
>>>
>>> On Jun 8, 2012, at 12:35 PM, Galder Zamarreño wrote:
>>>
>>>>
>>>> On Jun 8, 2012, at 12:26 PM, Galder Zamarreño wrote:
>>>>
>>>>> Hi all,
>>>>>
>>>>> Re: https://community.jboss.org/message/739399#739399
>>>>>
>>>>> This guy's using a combo of @EmbeddedId and @Embeddable in the
>>>>> tests his provided, and this is resulting in cache key serialized
>>>>> payloads differing for identical instances. Even in between runs,
>>>>> the last bit of the payload varies. This obviously results in keys
>>>>> not being found in the cache.
>>>
>>> The problem seems to come from here:
>>>
>>> CacheKey -> org.hibernate.type.TypeFactory$TypeScopeImpl ->
>>> SessionFactoryImpl -> uuid
>>>
>>> So, each CacheKey is this case contains the UUID of the session
>>> factory, and since each node's session factories are different, the
>>> UUIDs will be too, which results in different payloads for the same
>>> key.
>>>
>>> This would appear to be a bug in the Hibernate side? 2LC providers
>>> do nothing about CacheKey, they just know that an object needs to be
>>> serialized.
>>>
>>> Btw, that a simple key like the one in the example provided
>>> generates 3KB of byte[] sounds pretty excessive...
>>>
>>>>>
>>>>> Apart from this issue which I'm currently investigating, I've
>>>>> spotted that when the CacheKey is marshalled, it also marshalls
>>>>> the entity as part of the key. That sounds rather inefficient, so
>>>>> is this guy:
>>>>
>>>> ^ I think this statement is wrong, bear with me while I confirm.
>>>
>>> ^ I was wrong with this.
>>>
>>>>
>>>>>
>>>>> a) using the right pattenr for @EmbeddedId + @Embeddable
>>>>> b) is Hibernate behaving the right way here by having a reference
>>>>> to the entity from cache key
>>>>>
>>>>> Cheers,
>>>>> --
>>>>> Galder Zamarreño
>>>>> Sr. Software Engineer
>>>>> Infinispan, JBoss Cache
>>>>> _______________________________________________
>>>>> hibernate-dev mailing list
>>>>> hibernate-dev at lists.jboss.org
>>>>> https://lists.jboss.org/mailman/listinfo/hibernate-dev
>>>>
>>>> --
>>>> Galder Zamarreño
>>>> Sr. Software Engineer
>>>> Infinispan, JBoss Cache
>>>>
>>>>
>>>> _______________________________________________
>>>> hibernate-dev mailing list
>>>> hibernate-dev at lists.jboss.org
>>>> https://lists.jboss.org/mailman/listinfo/hibernate-dev
>>>
>>> --
>>> Galder Zamarreño
>>> Sr. Software Engineer
>>> Infinispan, JBoss Cache
>>>
>>>
>>> _______________________________________________
>>> hibernate-dev mailing list
>>> hibernate-dev at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/hibernate-dev
>>
>> _______________________________________________
>> hibernate-dev mailing list
>> hibernate-dev at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/hibernate-dev
>
> --
> steve at hibernate.org
> http://hibernate.org

--
steve at hibernate.org
http://hibernate.org