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https://issues.apache.org/jira/browse/LOG4J2-2899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17160513#comment-17160513
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Carter Kozak commented on LOG4J2-2899:
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https://github.com/apache/logging-log4j2/pull/390
> LogEventWrapper.getThread only works on the first invocation
> ------------------------------------------------------------
>
> Key: LOG4J2-2899
> URL: https://issues.apache.org/jira/browse/LOG4J2-2899
> Project: Log4j 2
> Issue Type: Bug
> Components: log4j 1.2 emulation
> Affects Versions: 2.13.3
> Reporter: Carter Kozak
> Assignee: Carter Kozak
> Priority: Major
> Time Spent: 20m
> Remaining Estimate: 0h
>
> LogEventWrapper.getThread attempts to memoize the thread value but returns
> null if the thread field is already set where it should return the field
> value.
>
> Additionally the thread is discovered using Thread.getAllStackTraces which is
> an expensive operation. In most cases it should be sufficient to check only
> the current thread, if the getThread method is called from another thread
> there's no guarantee that the original thread still uses the same name, or
> that it still exists.
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