[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3357) session.clear() takes too long

[Alex Pires de Camargo (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=31610#action_31610 ] 

Alex Pires de Camargo commented on HHH-3357:
--------------------------------------------

Its not just a performance improvement, the fix for HHH-511 generated this exponential search on clear (its linear for evict, exponential for clear). Session.clear should not take minutes to run in session with many proxies opened, in 3.2.3 or previous takes no time.

I would open a bug for this, but as you have already reported the problem, I found better to add more info to your report. If you prefer I can open another ticket.

> session.clear() takes too long
> ------------------------------
>
>                 Key: HHH-3357
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3357
>             Project: Hibernate Core
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 3.2.5, 3.2.6
>            Reporter: Jay Erb
>         Attachments: LazyInitializerPatch.txt
>
>
> Clearing a session that contains a large number of Proxies takes a very long time. The reason for this is that  null is set on the LazyInitializer when clearing the StatefulPersistenceContext, whenever a new session is set on an AbstractLazyInitializer, a check is done to see if the AbstractLazyInitializer is still attached to its previous session (and correctly throws an exception if it is). This check performs a linear search through all Proxies in the PersistenceContext. Since we're setting the session to null, do we really need to do this expensive linear search?
> I propose we not perform the linear search if the session being set on the AbstractLazyInitializer is null.

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