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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4741) Make Derby work reliably in the presence of thread interrupts
Date Tue, 19 Oct 2010 22:49:29 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4741?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dag H. Wanvik updated DERBY-4741:
---------------------------------

    Attachment: derby-4741-all+lenient+resurrect.stat
                derby-4741-all+lenient+resurrect.diff

A final version of the experimental patch, derby-4741-all+lenient+resurrect uploaded.
Main changes:
  - use lcc to store interrupt status for a session thread. If not available fall back on
a thread local.
  - resurrect the interrupt flag before returning to user app always, if we throw or not (see
next item)
  - don't throw if an API operation ran to completion without trouble, even if we did see
an interrupt flag

The ad hoc InterruptTest and JUnit Derby151Test should run OK on both Solaris and Windows
now.
The internal behavior is somewhat different since the JRE on Solaris throws InterrupedIOException
in more cases, cf. 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-all+lenient+resurrect.diff, derby-4741-all+lenient+resurrect.stat,
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, 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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