[hibernate-dev] Serializable SessionFactory

[Vlad Mihalcea]

Yes, out of the JVM. This PR allows the SF to be serialized to a file, so
the next time we bootstrap, we reload the whole SF from the file instead.

There are many unforeseen issues probably related to this PR and it might
hurt maintenance in the long-run.

For this reason, I'm going to leave the PR open as-is, and investigate
whether we can bootstrap faster by avoiding (cacahing) the DB metadata
retrieving the part.

Vlad

On Wed, Jan 10, 2018 at 7:45 PM, Steve Ebersole <steve at hibernate.org> wrote:

> The SessionFactory being Serialized outside the VM?  Because otherwise it
> is already "serializable" via VM serialization hooks
> and org.hibernate.internal.SessionFactoryRegistry.  And I'm not so
> convinced we should support serializing it for "out of" VM use aside from
> what we already do which assumes the new target VM has a similarly named
> SessionFactory in its org.hibernate.internal.SessionFactoryRegistry.
>
> On Wed, Jan 10, 2018 at 11:20 AM Vlad Mihalcea <mihalcea.vlad at gmail.com>
> wrote:
>
>> Hi,
>>
>> While reviewing old PRs we have in the ORM project, I stumbled on this one
>> about serializing the SessionFactory.
>>
>> I created a new PR, rebased on top of the current master branch and all
>> tests are passing fine.
>>
>> If anyone wants to take a look, this is the PR:
>>
>> https://github.com/hibernate/hibernate-orm/pull/2107
>>
>> I'm thinking we should integrate it in 5.3.Alpha and stabilize it if there
>> are some unforeseen changes.
>>
>> The only drawback is that, if we allow the SF to be Serializable,
>> upgrading
>> will be much more difficult in case we change object structure.
>> We could make it clear that this might not be supported or use the
>> serialVersionUID to point to Hibernate version: major.minor.patch.
>>
>> The main benefit is that, for a microservices architecture, Hibernate
>> could
>> start much faster this way.
>>
>> Vlad
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>