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https://issues.apache.org/jira/browse/LOG4J2-149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13552928#comment-13552928
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Ralph Goers commented on LOG4J2-149:
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Yeah. The way to handle this is to only add messages that match the filter to
the buffer.
> SMTPManager buffer access not synchronized; can result in empty emails
> ----------------------------------------------------------------------
>
> Key: LOG4J2-149
> URL: https://issues.apache.org/jira/browse/LOG4J2-149
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.0-beta4
> Environment: N/A
> Reporter: Scott Severtson
> Attachments: SMTPManager-buffer-synchronization.patch
>
>
> If multiple error events are logged against the same SMTPAppender/Manager at
> the same time, one email will contain both error messages, while the second
> will be empty (no events).
> The original SMTPAppender patch included synchronization against the
> CyclicBuffer to prevent such simultaneous access from multiple threads. This
> appears to have been lost in the merge/refactor. Patch (to follow shortly)
> re-introduces synchronization against the CyclicBuffer in the narrowest
> possible scope.
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