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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 Thu, 06 Oct 2011 20:43:29 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13122272#comment-13122272
] 

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

That deadlock error message format is wierd to me.  Did it change?  I am used to seeing all
grant and wait for each lock like this example from the documentation:
ERROR 40001: A lock could not be obtained due to a deadlock, cycle of locks and waiters is:
Lock : ROW, T, (1,8)
  Waiting XID : {235, S} , APP, select * from t where id = 2
  Granted XID : {238, X}
Lock : ROW, T, (1,7)
  Waiting XID : {238, S} , APP, select * from t where id = 1
  Granted XID : {235, X}
. The selected victim is XID : 235. 
                
> 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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