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From "Rick Hillegas (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-5687) Back out the concurrency improvements for identity columns introduced by derby-4437
Date Mon, 09 Apr 2012 16:17:20 GMT

     [ https://issues.apache.org/jira/browse/DERBY-5687?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Rick Hillegas updated DERBY-5687:

    Attachment: derby-5687-02-aa-publicAPI.diff

Attaching derby-5687-02-aa-publicAPI.diff. This patch adjusts the javadoc for SequencePreallocator,
which appears in Derby's public API. The patch removes references to identity columns so that
the javadoc now only talks about sequences. Committed at subversion revision 1311310.

Touches the following file:

M       java/engine/org/apache/derby/catalog/SequencePreallocator.java

> Back out the concurrency improvements for identity columns introduced by derby-4437
> -----------------------------------------------------------------------------------
>                 Key: DERBY-5687
>                 URL: https://issues.apache.org/jira/browse/DERBY-5687
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions:
>            Reporter: Rick Hillegas
>         Attachments: derby-5687-01-aa-backOutImprovement.diff, derby-5687-02-aa-publicAPI.diff
> DERBY-4437 attempted to improve the concurrency of identity columns by using SYSSEQUENCE-style
sequence generators. These improvements caused NsTest to behave differently than it used to
and they disclosed a problem in clearing the identity cache. The community lost confidence
in this solution and it was backed out of the 10.8 branch under issue DERBY-5448. This new
issue is filed to back the improvements out of the 10.9 trunk. Further useful discussion about
how to improve the concurrency and correctness of identity columns has been taking place on
DERBY-5443 and DERBY-5493.
> For the 10.9 release, identity columns will return to their old behavior of being ill-suited
for high concurrency applications. Applications which need higher concurrency should be re-coded
to use sequences rather than identity columns.

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