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https://issues.apache.org/jira/browse/LOG4J2-702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14059646#comment-14059646
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Sean Bridges commented on LOG4J2-702:
-------------------------------------
I don't think your example code works, I added some comments below,
{code}
public void logEvent(final LogEvent event) {
loggerConfig.incRef();
try {
config.getConfigurationMonitor().checkConfiguration();
//loggerConfig here may not be == to the loggerConfig you called
incRef() on
loggerConfig.log(event);
} finally {
//loggerConfig here may not be == to the loggerConfig you called
incRef() on
loggerConfig.decRef();
}
}
{code}
This also doesn't work,
{code}
LoggerConfig origConfig = loggerConfig;
origConfig.incRef();
try {
//use origConfig
//however this is the same as the original problem
} finally {
origConfig.decRef();
}
{code}
> LoggerConfig#waitForCompletion is not thread safe
> -------------------------------------------------
>
> Key: LOG4J2-702
> URL: https://issues.apache.org/jira/browse/LOG4J2-702
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.0-rc2
> Reporter: Sean Bridges
> Assignee: Matt Sicker
> Priority: Critical
> Fix For: 2.0
>
>
> This is in trunk, svn commit 1608156
> LoggerConfig#waitForCompletion uses an AtomicInteger counter to try to detect
> if there are any calls currently executing the log(Event) method, but it does
> not do so in a thread safe manner. Consider two threads A and B, where
> Thread A is calling clearAppenders(), and Thread B is calling log(Event),
> {code}
> Thread A loggerConfig.clearAppenders()
> Thread A loggerConfig.waitForCompletion()
> Thread A counter.get() //returns 0
> Thread A //loggerConfig.waitForCompletion() returns
> Thread B loggerConfig.log(Event)
> Thread B counter.increment()
> Thread A proceeds assuming no log calls are onging, but thread B is in the
> log method
> {code}
> I'm not sure what the requirements are, but if the requirement is to not lose
> logging events, I think you need some sort of synchronization outside of the
> LoggerConfig object.
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