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From "Jacques Le Roux (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OFBIZ-2353) SequenceUtil may generate duplicate IDs in Load Balancing mode
Date Tue, 02 Sep 2014 09:10:20 GMT

    [ https://issues.apache.org/jira/browse/OFBIZ-2353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14118052#comment-14118052

Jacques Le Roux commented on OFBIZ-2353:

Thanks for your explanation Adrian, so the known pattern in code litterature is the CSMA/CD.

About performance, we should remember that the size of the bank is an important parameter

If performance is a crucial concern, people might look at using solution like CREATE SEQUENCE...
Of course not in OFBiz OOTB...

> SequenceUtil  may generate duplicate IDs in Load Balancing mode
> ---------------------------------------------------------------
>                 Key: OFBIZ-2353
>                 URL: https://issues.apache.org/jira/browse/OFBIZ-2353
>             Project: OFBiz
>          Issue Type: Bug
>          Components: framework
>    Affects Versions: Release Branch 4.0, Release Branch 09.04, Trunk
>            Reporter: Philippe Mouawad
>            Assignee: Jacopo Cappellato
>            Priority: Critical
>             Fix For: Release Branch 10.04, Upcoming Branch
>         Attachments: OFBIZ-2353 SELECT FOR UPDATE solution.patch, OFBIZ-2353 SELECT FOR
UPDATE solution.patch, OFBIZ-2353-AC.patch, OFBIZ-2353-AC.patch
> If Ofbiz is deploy on 2 servers in Load Balancing Mode
> SequenceUtil will generate duplicate IDs because synchronization is done at JVM level
instead of doing it in DB.
> A good replacement implementation would be:
> org.hibernate.id.enhanced.TableGenerator
> But it would involve a dependency on Hibernate
> Philippe
> www.ubik-ingenierie.com

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