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From "Mike Matrigali (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5448) In the 10.8 branch, back out the concurrency improvements introduced by using SequenceUpdaters to allocate identity values.
Date Sun, 09 Oct 2011 18:07:29 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123745#comment-13123745
] 

Mike Matrigali commented on DERBY-5448:
---------------------------------------

I was trying to binary search the deadlock error in the 10.8 branch, but it seems to not reproduce
all the time for me.  So far I have 
reproduced once as far back as 1170106.  but running for 2 hours did not reproduce again.
 I have not reproduced later than this but
that particular issue makes no sense to cause this.
svn update -r 1170106 deadlock in 34 minutes.
svn update -r 1170106 no deadlock in 120 minutes.

I think the only thing that can be deduced is that deadlock is caused by something before
1170106 or it has always been around and
just unlucky to cause it.  I'll try a few more, but if anyone has time and sees a deadlock
in 10.8 sometime before this change post it.
                
> In the 10.8 branch, back out the concurrency improvements introduced by using SequenceUpdaters
to allocate identity values.
> ---------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5448
>                 URL: https://issues.apache.org/jira/browse/DERBY-5448
>             Project: Derby
>          Issue Type: Bug
>          Components: Documentation, SQL
>    Affects Versions: 10.8.2.1
>            Reporter: Rick Hillegas
>             Fix For: 10.8.2.1
>
>         Attachments: derby-5448-01-aa-backoutConcurrencyChanges.diff, derby-5448-02-aa-backoutDocsChanges.diff
>
>
> New errors were seen while running NsTest against the 10.8.2 release candidates. These
errors are recorded as DERBY-5430 and DERBY-5422. The first error is a deadlock which occurs
when inserting into the main table of the test. The second error is a problem clearing the
identity cache. These errors have caused people to lose confidence in the concurrency improvements
introduced by DERBY-4437. We should back the DERBY-4437 changes out of the 10.8 branch and
use the trunk to continue debugging the problems disclosed by NsTest.

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