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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4741) Make Derby work reliably in the presence of thread interrupts
Date Tue, 25 Jan 2011 21:59:44 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12986710#action_12986710

Knut Anders Hatlen commented on DERBY-4741:

> I think I will commit the patch with the long running time for now. I'd rather flush
out any bugs here sooner rather than later.

Sounds good. +1

> I always agonize about whether to include c/s tests or not when the changes are seemingly
embedded/server-side only

I don't have a general rule, but in this particular case it looks like we run the entire test
inside a stored procedure in order to make sure that only embedded is tested. Sounds like
a good indication that embedded only would suffice... :) We could probably simplify the test
somewhat and remove the stored procedure indirection too if we made it embedded only.

> Make Derby work reliably in the presence of thread interrupts
> -------------------------------------------------------------
>                 Key: DERBY-4741
>                 URL: https://issues.apache.org/jira/browse/DERBY-4741
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions:,,,,,,,,,,
>            Reporter: Dag H. Wanvik
>            Assignee: Dag H. Wanvik
>         Attachments: derby-4741-a-01-api-interruptstatus.diff, derby-4741-a-01-api-interruptstatus.stat,
derby-4741-a-02-api-interruptstatus.diff, derby-4741-a-02-api-interruptstatus.stat, derby-4741-a-03-api-interruptstatus.diff,
derby-4741-a-03-api-interruptstatus.stat, derby-4741-a-04-api-interruptstatus.diff, derby-4741-a-04-api-interruptstatus.stat,
derby-4741-all+lenient+resurrect.diff, derby-4741-all+lenient+resurrect.stat, derby-4741-b-01-nio.diff,
derby-4741-b-01-nio.stat, derby-4741-b-02-nio.diff, derby-4741-b-02-nio.stat, derby-4741-b-03-nio.diff,
derby-4741-b-03-nio.stat, derby-4741-b-04-nio.diff, derby-4741-b-04-nio.stat, derby-4741-c-01-nio.diff,
derby-4741-c-01-nio.stat, derby-4741-kristians-01.diff, derby-4741-nio-container+log+waits+locks+throws.diff,
derby-4741-nio-container+log+waits+locks+throws.stat, derby-4741-nio-container+log+waits+locks-2.diff,
derby-4741-nio-container+log+waits+locks-2.stat, derby-4741-nio-container+log+waits+locks.diff,
derby-4741-nio-container+log+waits+locks.stat, derby-4741-nio-container+log+waits.diff, derby-4741-nio-container+log+waits.stat,
derby-4741-nio-container+log.diff, derby-4741-nio-container+log.stat, derby-4741-nio-container-2.diff,
derby-4741-nio-container-2.log, derby-4741-nio-container-2.stat, derby-4741-nio-container-2b.diff,
derby-4741-nio-container-2b.stat, derby-4741-raf-stresstest-1.diff, derby-4741-raf-stresstest-1.stat,
derby-4741-raf-stresstest-2.diff, derby-4741-raf-stresstest-2.stat, derby-4741-sleeps-waits-1.diff,
derby-4741-sleeps-waits-1.stat, derby-4741-sleeps-waits-2.diff, derby-4741-sleeps-waits-2.stat,
derby-4741-sleeps-waits-3.diff, derby-4741-sleeps-waits-3.stat, derby.log, derby.log, InterruptResilienceTest.java,
MicroAPITest.java, xsbt0.log.gz
> When not executing on a small device VM, Derby has been using the Java NIO classes java.nio.clannel.*
for file io.
> If thread is interrupted while executing blocking IO operations in NIO, the ClosedByInterruptException
will get thrown. Unfortunately, Derby isn't current architected to retry and complete such
operations (before passing on the interrupt), so the Derby database can be left in an inconsistent
state and we therefore have to return a database level error. This means the applications
can no longer access the database without a shutdown and reboot including a recovery.
> It would be nice if Derby could somehow detect and finish IO operations underway when
thread interrupts happen before passing the exception on to the application. Derby embedded
is sometimes embedded in applications that use Thread.interrupt to stop threads.

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