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https://issues.apache.org/jira/browse/DERBY-4741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12969530#action_12969530
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Dag H. Wanvik edited comment on DERBY-4741 at 12/8/10 5:25 PM:
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While I am looking for the Heisenbug in DERBY-4920, I am considering the next
increment of this patch from the
prototype patch regarding the issues seen when interrupt hits the logging
machinery (mostly not NIO, except for the case of DirRandomAccessFile#sync).
Now, it turns out that the vulnerability here only applies for Solaris. Other
platforms' "non-NIO" IO is not interruptible, so for those other platforms
there is no need to do anything special. For Solaris, the behavior can be
tweaked to be impervious to interrupts as well using the special switch:
-XX:-UseVMInterruptibleIO on JVMs >= 1.5.0_12. This behavior will be default in
1.7 also on Solaris[1].
So the question becomes, would it be sufficient to advise users to run with
this switch set, or should we make Derby tolerate
the interrupts on Solaris here also?
I do think we should be able to run correctly with the default settings on all
relevant platforms, but I would appricate your opinions.
[1] http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4385444
was (Author: dagw):
While I am looking for the Heisenbug in DERBY-4920, I am considering the
next increment of this patch from the
prototype patch regarding the issues seen when interrupt hits the logging
machinery (mostly not NIO, except for the case of DirRandomAccessFile#sync).
Now, it turns out that the vulnerability here only applies for Solaris. Other
platforms' "non-NIO" IO is not interruptible, so for those other platforms
there is no need to do anything special. For Solaris, the behavior can be
tweaked to be impervious to interrupts as well using the special switch:
-XX:-UseVMInterruptibleIO on JVMs >= 1.5.0_12. This behavior which will be
default in 1.7 also on Solaris[1].
So the question becomes, would it be sufficient to advise users to run with
this switch set, or should we make Derby tolerate
the interrupts on Solaris here also?
I do think we should be able to run correctly with the default settings on all
relevant platforms, but I would appricate your opinions.
[1] http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4385444
> 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: 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: 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.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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