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From "Keith Wall (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (QPID-3501) LogMonitor can corrupt test logs files and cause tests subclassing AbstractLoggingTests to fail.
Date Fri, 23 Sep 2011 11:00:27 GMT

     [ https://issues.apache.org/jira/browse/QPID-3501?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Keith Wall resolved QPID-3501.
------------------------------

    Resolution: Fixed

Submitted further change to prevent LogMonitor from duplicating contents of the log file,
address a busy-wait, and use autoflush PrintStream.

> 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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