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https://issues.apache.org/jira/browse/OPENJPA-1765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12899192#action_12899192
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Rick Curtis commented on OPENJPA-1765:
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@Milosz - Yes I believe so.
> TableGenerator doesn't properly utilize all keys when under heavy stress.
> -------------------------------------------------------------------------
>
> Key: OPENJPA-1765
> URL: https://issues.apache.org/jira/browse/OPENJPA-1765
> Project: OpenJPA
> Issue Type: Bug
> Components: jdbc
> Affects Versions: 2.0.0, 2.1.0
> Reporter: Rick Curtis
> Assignee: Rick Curtis
> Fix For: 2.1.0
>
> Attachments: OPENJPA-1765.patch
>
>
> TableJDBCSeq has a locking problem where multiple threads can run on top of
> each other resulting in all keys not being used for a given sequence.
> While unit testing a fix I also uncovered another theoretical start up
> problem where multiple threads can try to insert the same row into the DB
> resulting in a duplicate key exception.
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