[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3407) @TableGenerator does not increment pkColumnValue by allocationSize

[Brett Wooldridge (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3407?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=38322#action_38322 ] 

Brett Wooldridge commented on HHH-3407:
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This is a major performance issue for customers using @TableGenerator, how is this not fixed 2 years after opening?

> @TableGenerator does not increment pkColumnValue by allocationSize
> ------------------------------------------------------------------
>
>                 Key: HHH-3407
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3407
>             Project: Hibernate Core
>          Issue Type: Bug
>    Affects Versions: 3.2.4, 3.2.6
>         Environment: JBoss 4.2.3, RHEL4, JDK1.5
>            Reporter: Dan Ciarniello
>
> According to the JPA, the allocationSize attribute to @TableGenerator is "The amount to increment by when allocating id numbers from the generator" but the value is actually incremented by 1 regardless of allocationSize.  The id is generated properly apparently according to the formula 
> id = lastkeyval*allocationSize + i where 0<i<allocationSize
> The problems with this algorithm are:
> 1. One cannot tell what the next key value range is from the key table without knowing the allocationSize (minor)
> 2. If the allocationSize is reduced, already existing key values will be generated (major)
> 3. If two applications are configured with different allocation sizes, there will be an overlap in generated values (major)

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