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https://issues.apache.org/jira/browse/LOG4J2-2031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16173352#comment-16173352
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ASF subversion and git services commented on LOG4J2-2031:
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Commit 3f5d58cd32ad96ccb4a644fc32be11ffca0e5922 in logging-log4j2's branch
refs/heads/master from rpopma
[ https://git-wip-us.apache.org/repos/asf?p=logging-log4j2.git;h=3f5d58c ]
LOG4J2-2031 added tests
> Messages appear out of order in log file (was: Log4j2 log file not reflecting
> application log function calls)
> -------------------------------------------------------------------------------------------------------------
>
> Key: LOG4J2-2031
> URL: https://issues.apache.org/jira/browse/LOG4J2-2031
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.8.2, 2.9.0, 2.9.1
> Environment: Windows, Sun Java 8.
> Reporter: Colin McDowell
> Assignee: Remko Popma
> Fix For: 2.10.0
>
> Attachments: CapacityTest.java, log4j2.xml, pom2.xml
>
> Original Estimate: 672h
> Remaining Estimate: 672h
>
> Was hoping to move our numerous J2EE projects from Log4j to Log4j2 for the
> performance improvements. I put together a small test case that writes a
> string pattern to a Rolling File. There is a 6 digit sequence number at the
> start of the log message. This allows me to quickly see if all the log
> requests are making it into the log file. I attach the test case and
> log4j2.xml. The log4j2.xml uses an asynchronous appender.
> What I observe in the output log file is that after a short interval (120 or
> so entries) the logged are appearing in the wrong order, and entries can be
> missing. The missing entries issues especially shows up when rolling to the
> next log file.
> Perhaps there is a deliberate decision to not to guarantee log file
> accurately for speed. However we need the logs to accurately reflect what
> the application is logging. I have also noticed the performance is 25% worse
> in Log4j2 than Log4j when not using the asynchronous appender. So that
> rather kills us using Log4j2 at the moment.
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