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From "Milosz Tylenda (JIRA)" <j...@apache.org>
Subject [jira] Updated: (OPENJPA-1376) @SequenceGenerator allocationSize incorrect implementation
Date Sun, 27 Feb 2011 11:18:58 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-1376?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Milosz Tylenda updated OPENJPA-1376:
------------------------------------

      Component/s: performance
         Priority: Major  (was: Critical)
    Fix Version/s: 2.2.0
          Summary: @SequenceGenerator allocationSize incorrect implementation  (was: @GeneratedValue
allocationSize incorrect implementation)

> @SequenceGenerator allocationSize incorrect implementation
> ----------------------------------------------------------
>
>                 Key: OPENJPA-1376
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1376
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: competitive, jdbc, performance
>    Affects Versions: 1.2.1, 2.0.0-M3
>         Environment: All
>            Reporter: Yves
>            Assignee: Milosz Tylenda
>             Fix For: 2.2.0
>
>         Attachments: cache-native-seq-values.diff
>
>   Original Estimate: 8h
>  Remaining Estimate: 8h
>
> OpenJpa use allocationSize parameter on NativeJDBCSeq to set the sequence cache value.
> But one "JSR 220: Enterprise JavaBeansTM,Version 3.0" , the allocationSize is : "The
amount to increment by when allocating sequence
> numbers from the sequence."
> Allocating is used to limit the number of access to the sequence or table not to set
the sequence cache value !
> If allocationSize=50, the sequence need to be call one time on each 50 call on AbstractJDBCSeq.next().
> 1 call on AbstractJDBCSeq.next(). call the sequence or table 
> 2 call : return previous value + 1;
> 3 call : return previous value + 2;
> ...
> 51 call :re-call the sequence
> 52 return previous value + 1
> ...

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