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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4741) Make Derby work reliably in the presence of thread interrupts
Date Thu, 07 Oct 2010 17:17:31 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12918977#action_12918977
] 

Dag H. Wanvik commented on DERBY-4741:
--------------------------------------

Now, heading back to Solaris after having flushed out NIO issues on Windows, I see that Derby
falls over when it gets interrupted
during transaction abort (XSTB0), as a result of receving an interrupt during a log flush
wait(LogToFile.java:4048). I saw this using InterruptedTest in the patch. The test tries to
reconnect (reboot), but eventually I can no longer get a connection, because I  hit a NullPointerException
in BaseDataFileFactory.java:639 (containerCache empty??). Cf enclosed xsbt0.log.


> 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-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
>
>
> 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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