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From "Albert Lee (JIRA)" <j...@apache.org>
Subject [jira] Work started: (OPENJPA-1943) Query timeout hint not honored consistently when pessimistic lock is issued to database requires multi-statements locking scheme
Date Fri, 18 Feb 2011 17:04:38 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-1943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on OPENJPA-1943 started by Albert Lee.

> Query timeout hint not honored consistently when pessimistic lock is issued to database
requires multi-statements locking scheme
> --------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-1943
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1943
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: jpa, kernel
>    Affects Versions: 2.0.1, 2.1.0, 2.2.0
>            Reporter: Albert Lee
>            Assignee: Albert Lee
>             Fix For: 2.1.1, 2.2.0
>
>         Attachments: OPENJPA-1943.patch
>
>
> Query timeout and lock timeout values are stored in fetch plan/configuration. Due to
semantic difference between the Query and em API, separate fetch plan/configuration objects
are attached to QueryImpl and EntityManagerImpl. 
> When pessimistic lock is enforced by the provider to a query, if the underlying data
base requires to generate multiple SQL statements, the timeout value from the QueryImpl is
used to execute the data portion of the SQL statements but the timeout value from the EntityManagerImpl
is used to issue the "FOR UPDATE" lock to the related table. This caused the discrepancy that
the query timeout is NOT being honored. As a result, some database may wait forever and caused
a "hung" scenario even the query timeout value is set. 
>     

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