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From "Rick Hillegas (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5494) Same value returned by successive calls to a sequence generator flanking an unorderly shutdown.
Date Fri, 20 Apr 2012 18:30:47 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13258453#comment-13258453
] 

Rick Hillegas commented on DERBY-5494:
--------------------------------------

I don't think this fix should be backported in isolation. We would want to boost the pre-allocation
range as well to retrieve the lost concurrency. Then we would want to warn users to always
shutdown their databases gracefully in order to avoid leaking the longer preallocation range.
Won't this fix degrade the concurrency of identity columns also? That might be a surprising
consequence of upgrading to a supposedly stable bug-fix release.
                
> Same value returned by successive calls to a sequence generator flanking an unorderly
shutdown.
> -----------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5494
>                 URL: https://issues.apache.org/jira/browse/DERBY-5494
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.6.1.0, 10.6.2.1, 10.7.1.1, 10.8.1.2, 10.8.2.2, 10.9.0.0
>            Reporter: Rick Hillegas
>            Assignee: Mike Matrigali
>              Labels: derby_triage10_9
>         Attachments: derby-5494_diff_1a.txt, derby-5494_diff_2.txt
>
>
> The following sequence of steps causes a sequence generator to return the same value
on successive NEXT VALUE FOR calls.
> 1) Bring up ij and issue the following commands:
> connect 'jdbc:derby:db;create=true';
> create sequence s;
> values next value for s; 
> 2) Control-c out of ij so that the engine comes down hard without an orderly shutdown.
> 3) Now bring up ij again and issue the following commands:
> connect 'jdbc:derby:db';
> values next value for s; 
> Thanks to Knut for finding this one.

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