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https://issues.apache.org/jira/browse/DERBY-5440?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen updated DERBY-5440:
--------------------------------------
Attachment: d5440.diff
The attached patch changes the test case in a way similar to DERBY-5278 to
provide better synchronization between the main test thread and the helper
thread. It adds a barrier to ensure that the main thread has started the index
scan before the helper thread inserts new rows at the beginning of the index
(the problem in this bug seems to be that the rows have been inserted before
the scan started, and they unexpectedly show up in the scan result).
A helper class called Barrier is introduced (java.util.concurrent.CyclicBarrier
provides the same functionality, but cannot be used since it requires Java 5),
and the patch rewrites the fix for DERBY-5278 to use the new helper class too.
> test failure in
> testBTreeForwardScan_fetchRows_resumeAfterWait_nonUnique_split(org.apache.derbyTesting.functionTests.tests.store.IndexSplitDeadlockTest)junit.framework.AssertionFailedError:
> expected:<1> but was:<0>
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-5440
> URL: https://issues.apache.org/jira/browse/DERBY-5440
> Project: Derby
> Issue Type: Bug
> Components: Test
> Affects Versions: 10.8.2.1
> Environment: IBM iseries 6.1, Classic 1.6 JVM
> Reporter: Myrna van Lunteren
> Assignee: Knut Anders Hatlen
> Priority: Trivial
> Attachments: d5440.diff
>
>
> During the QA Cycle for 10.8.2.1 I also ran on a next version of the iseries
> OS, and saw this failure. It did not reproduce when I reran the test by
> itself. The test has the following comment:
> // Give the other thread time to obtain the lock
> Thread.sleep(1000);
> // Perform an index scan. Will be blocked for a while when fetching
> // the row where x=100, but should be able to resume the scan.
> ResultSet rs = s.executeQuery(
> "select * from t --DERBY-PROPERTIES index=IDX");
> for (int i = 0; i < 300; i++) {
> assertTrue(rs.next());
> assertEquals(i, rs.getInt(1)); <====
> this is the line of the failure.
> }
> I think this is a rather slow machine, and that's likely why I saw the
> failure, perhaps the sleep wasn't long enough on this machine.
> Here is the stack trace:
> 1)
> testBTreeForwardScan_fetchRows_resumeAfterWait_nonUnique_split(org.apache.derbyTesting.functionTests.tests.store.IndexSplitDeadlockTest)junit.framework.AssertionFailedError:
> expected:<1> but was:<0>
> at java.lang.Throwable.<init>(Throwable.java:195)
> at java.lang.Error.<init>(Error.java:49)
> at
> junit.framework.AssertionFailedError.<init>(AssertionFailedError.java:13)
> at
> org.apache.derbyTesting.functionTests.tests.store.IndexSplitDeadlockTest.testBTreeForwardScan_fetchRows_resumeAfterWait_nonUnique_split(IndexSplitDeadlockTest.java:526)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:27)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at
> org.apache.derbyTesting.junit.BaseTestCase.runBare(BaseTestCase.java:92)
> at junit.extensions.TestDecorator.basicRun(TestDecorator.java:24)
> at junit.extensions.TestSetup$1.protect(TestSetup.java:21)
> at junit.extensions.TestSetup.run(TestSetup.java:25)
> at
> org.apache.derbyTesting.junit.BaseTestSetup.run(BaseTestSetup.java:57)
> at junit.extensions.TestDecorator.basicRun(TestDecorator.java:24)
> at junit.extensions.TestSetup$1.protect(TestSetup.java:21)
> at junit.extensions.TestSetup.run(TestSetup.java:25)
> at
> org.apache.derbyTesting.junit.BaseTestSetup.run(BaseTestSetup.java:57)
> derby.log has no useful info.
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