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From "Keith Wall (JIRA)" <j...@apache.org>
Subject [jira] [Created] (QPID-3501) LogMonitor can corrupt test logs files and cause tests subclassing AbstractLoggingTests to fail.
Date Thu, 22 Sep 2011 14:34:26 GMT
LogMonitor can corrupt test logs files and cause tests subclassing AbstractLoggingTests to
fail.
------------------------------------------------------------------------------------------------

                 Key: QPID-3501
                 URL: https://issues.apache.org/jira/browse/QPID-3501
             Project: Qpid
          Issue Type: Bug
          Components: Java Tests
            Reporter: Keith Wall
            Assignee: Keith Wall
             Fix For: 0.13


On an old slow CI box, occasionally we see test failures from those tests subclassing AbstractLoggingTests
(ChannelLoggingTests, ExchangeLoggingTest etc).

For example:   org.apache.qpid.server.logging.ExchangeLoggingTest fails on the 0-9-1 test
profile with exception:

{code}
TestName: testDiscardedMessage Duration: 11.167

Incorrect message expected:<...3> but was:<...1>
                                

junit.framework.ComparisonFailure: Incorrect message expected:<...3> but was:<...1>
	at org.apache.qpid.server.logging.AbstractTestLogging.validateMessageID(AbstractTestLogging.java:119)
	at org.apache.qpid.server.logging.ExchangeLoggingTest.testDiscardedMessage(ExchangeLoggingTest.java:249)
	at org.apache.qpid.test.utils.QpidBrokerTestCase.runBare(QpidBrokerTestCase.java:238)
	at org.apache.qpid.test.utils.QpidTestCase.run(QpidTestCase.java:131)
{code}

Analysis shows that the tests' assertions are failing because the test standard out file is
corrupt.  When the test fails, the .out file contains a long sequence of ASCII NULs and parts
of the log are duplicated.  It is the duplication that causes the assertion failure, as the
log files contain incorrect numbers of operation log messages (EXH- in this case). 
 

{code}
od -a TEST-org.apache.qpid.server.logging.ExchangeLoggingTest.testDiscardedMessage.out | head
0000000 nul nul nul nul nul nul nul nul nul nul nul nul nul nul nul nul
*
0164000 nul nul nul nul nul nul nul nul nul nul nul nul m a i n
0164020 sp 2 0 1 1 - 0 9 - 2 1 sp 2 1 : 1

{code}

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