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https://issues.apache.org/jira/browse/OPENJPA-1414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dianne Richards reopened OPENJPA-1414:
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Reopening this issue to add doc patches
> Performance improvements for detach
> -----------------------------------
>
> Key: OPENJPA-1414
> URL: https://issues.apache.org/jira/browse/OPENJPA-1414
> Project: OpenJPA
> Issue Type: Improvement
> Components: kernel
> Affects Versions: 1.2.1
> Reporter: Dianne Richards
> Assignee: Dianne Richards
> Fix For: 1.2.2, 1.3.0, 2.0.0
>
> Attachments: DM_1.2.x_patch.txt, DM_2.0_patch.txt,
> DM_testcase_patch.txt
>
>
> In performance runs, a lot of the time is spent on detach processing. This is
> partially because a detach all is always done after an EntityManager clear()
> or close(). Therefore, we nee to make the detach processing as efficient as
> possible. There are 2 areas that we've found where this can be done:
> 1 - DetachManager always attempts to load fields when detaching all. This
> does not appear to be necessary when the default DetachState option of
> "loaded" is used.
> 2 - Detach goes through a bunch of processing to "detach version", which
> essentially copies the version to the entity that is to be returned. But,
> when detach all internal is, no copy is being made of the original entity.
> And, it appears that the original entity always has the version. So, this
> processing is not necessary in this scenario.
> To be cautious, a new Compatibility property option is being created -
> reloadOnDetach - to control both of these behavior. In 1.2.x, it will be true
> by default, so behavior will not be changed for current users. The user will
> have to set this property to false in order to get the performance benefit.
> If all goes well, the property will be set to false by default in 2.0.
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