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https://issues.apache.org/jira/browse/LOG4J2-1628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15776495#comment-15776495
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Remko Popma commented on LOG4J2-1628:
-------------------------------------
[~markbowman] It turns out this is a regression caused by LOG4J2-1343:
If [direct
encoding|https://logging.apache.org/log4j/2.x/log4j-core/apidocs/org/apache/logging/log4j/core/util/Constants.html#ENABLE_DIRECT_ENCODERS]
is enabled (true by default), then FileAppender [does not
call|https://github.com/apache/logging-log4j2/blob/56aac98b0569531e6af4e7917c053c172ce30c6a/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/AbstractOutputStreamAppender.java#L167]
the {{FileAppender.write}} method where the file is locked.
In Log4j 2.6 and later, you can work around this issue by setting system
property {{log4j2.enable.direct.encoders}} to "false".
The fix is likely to override {{OutputStreamManager.writeToDestination}} in
FileManager, and lock the FileChannel in that method, similar to how
[FileAppender.write|https://github.com/apache/logging-log4j2/blob/dd943975b7c809c3d302237cecf7116c9c9e9ea2/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/FileManager.java#L120]
overrides {{OutputStreamManager.write}}.
> Scrambled log messages
> ----------------------
>
> Key: LOG4J2-1628
> URL: https://issues.apache.org/jira/browse/LOG4J2-1628
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.6.2
> Environment: centos
> Reporter: Mark Bowman
> Assignee: Remko Popma
>
> We have several threads writing to an async file with locking set to true.
> Under log4j 2.5 the message from each thread are interleaved correctly. Using
> log4j 2.6.2 some messages are scrambled as if multiple threads are writing to
> the file simultaneously. Reverting to 2.5 fixes the problem.
> Configuration to follow.
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