[
https://issues.apache.org/jira/browse/JDO-623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12848828#action_12848828
]
Andy Jefferson commented on JDO-623:
------------------------------------
Rerun test. Still fails.
SELECT AVG((A0.X + VAR_POINT2.Y)) FROM DATASTOREIDENTITY0.PCPOINT
A0,DATASTOREIDENTITY0.PCPOINT2 VAR_POINT2 WHERE A0.Y >= 0 AND VAR_POINT2.X >= 0
Execution Time = 44 ms
If you want to try it yourself, use DN nightly jars 2.1.0-m1-SNAPSHOT of
"datanucleus-core" and "datanucleus-rdbms".
PS. Derby does some weird stuff in the JDBC call ResultSet.next() which hangs
for 10seconds or so on this query. Presumably it evaluates the AVG of that
query at that point, so hence the actual query execution is "fast", and hence a
timeout is pointless.
> Query cancel and timeout support
> --------------------------------
>
> Key: JDO-623
> URL: https://issues.apache.org/jira/browse/JDO-623
> Project: JDO
> Issue Type: New Feature
> Components: api2, tck2
> Reporter: Andy Jefferson
> Fix For: JDO 2 maintenance release 3
>
> Attachments: JDO-623-mbo.patch, JDO-623-tck2-mbo.patch,
> JDO-623-testcase.patch, JDO-623-ZeroTimeoutTestcase.patch, jdo623.patch,
> jdo623.patch, pmf_option.patch, query.patch, query_timeout.patch
>
>
> JDO doesn't have a mechanism to stop queries from overrunning. JPA2 now
> allows
> a persistence property to allow timing them out, and most JDO implementations
> have allowed this as an extension since JDO1. It would make sense for JDO
> (2.3) to have the same or a variation. I propose having the following
> Simple PMF property "javax.jdo.option.queryTimeout" to specify the number of
> millisecs (or secs) before any query is timed out. Throw a
> QueryTimeoutException (extends JDOException) when the timeout happens.
> Add methods Query.setTimeout(int), Query.getTimeout() to allow
> setting/retrieving the timeout interval on a per-query basis.
> Add method Query.cancel() to cancel any running query. If an implementation
> doesn't support cancelling of queries then it should throw a
> JDOUnsupportedOptionException. Any query execute() that is cancelled will
> throw a QueryInterruptedException (extends JDOUserException).
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
