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From "Donald Woods (JIRA)" <j...@apache.org>
Subject [jira] Updated: (OPENJPA-991) Implement LockTimeout using db specific server-side lock timeout feature
Date Wed, 24 Feb 2010 14:22:27 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-991?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Donald Woods updated OPENJPA-991:
---------------------------------

    Fix Version/s:     (was: 2.0.0)
                   2.0.0-beta

> Implement LockTimeout using db specific server-side lock timeout feature
> ------------------------------------------------------------------------
>
>                 Key: OPENJPA-991
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-991
>             Project: OpenJPA
>          Issue Type: Improvement
>          Components: kernel
>    Affects Versions: 1.0.4, 1.1.1, 1.2.2, 1.3.0, 2.0.0
>            Reporter: Albert Lee
>             Fix For: 1.2.2, 2.0.0-beta
>
>
> This issue is originally reported by Donald Woods in OPENJPA-957.
> "Looks like the existing implementation (not defined in JPA 1.0 Spec and OpenJPA specific)
is using setQueryTimeout() in PessimisticLockManager, which is a client side JDBC timeout
function, while lock timeouts are implemented in the DB server. See -
> DB2 - http://publib.boulder.ibm.com/infocenter/db2luw/v8/index.jsp?topic=/com.ibm.db2.udb.doc/admin/r0011874.htm
> MS SQL - http://msdn.microsoft.com/en-us/library/aa213032(SQL.80).aspx
> Derby - config property - http://db.apache.org/derby/docs/dev/devguide/cdevconcepts16400.html
> Oracle - LOCKWAIT on the connection or on the DB
> Also, the following discussion gives a good overview of the two and why apps should use
both to handle unreliable network conditions -
> http://social.msdn.microsoft.com/Forums/en-US/sqldataaccess/thread/95755534-bbef-4c2c-afa4-b80ca2a2c333/"
> This issue caused TestException.testThrowsOptimisticException to hang when run against
DB2 because the default lock timeout is -1 on DB2, which means to wait forever. This test
case will be disabled until the issue is resolved and re-enabled.
> Albert Lee.

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