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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4741) Make embedded Derby work reliably in the presence of thread interrupts
Date Fri, 11 Feb 2011 14:02:57 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12993494#comment-12993494
] 

Rick Hillegas commented on DERBY-4741:
--------------------------------------

Thanks for the extra clarification, Dag. That will be useful for programmers who want to understand
the code. I think we have a clear enough picture of the user experience that we can document
this feature now. Thanks. 

> Make embedded 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: 10.2.1.6, 10.2.2.0, 10.3.1.4, 10.3.2.1, 10.3.3.0, 10.4.1.3, 10.4.2.0,
10.5.1.1, 10.5.2.0, 10.5.3.0, 10.6.1.0
>            Reporter: Dag H. Wanvik
>            Assignee: Dag H. Wanvik
>         Attachments: InterruptResilienceTest.java, MicroAPITest.java, 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-raf-stresstest-3.diff,
derby-4741-raf-stresstest-3.stat, derby-4741-raf-stresstest-4.diff, derby-4741-raf-stresstest-4.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-4741-testBatchInterrupt-b.diff, derby-4741-testBatchInterrupt.diff, derby-4741-testQueryInterrupt.diff,
derby-4741-testQueryInterrupt.stat, derby.log, derby.log, interrupts-fs.html, interrupts-fs.html,
interrupts-fs.html, 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 for extra concurrency.
> If a 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 store can be left in an
inconsistent state, although no data is corrupted, and we therefore have to return a database
level error to perform shutdown and recovery. This means the applications can no longer access
the database while a shutdown and reboot including a recovery is taking place.
> 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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