fabrizio giustina created LOG4J2-2007:
-----------------------------------------
Summary: Async logger loose ThreadContext values for header/footer
Key: LOG4J2-2007
URL: https://issues.apache.org/jira/browse/LOG4J2-2007
Project: Log4j 2
Issue Type: Bug
Reporter: fabrizio giustina
Priority: Minor
ThreadContext values seems not handled properly in header/footer properties of
PatternLayout when using async logging.
Tested with a SMTP appended with a pattern layout: header is populated property
in sync mode but it doesn't work anymore when switching to async (both using an
Async appender than switching to async globally)
This is a simple appender configuration that shows this behaviour:
{noformat}
<SMTP name="sync-mail" to="n...@example.com"
from="TEST<n...@example.com>" smtpHost="localhost" smtpPort="25"
ignoreExceptions="false" subject="MDCSUBJECT%X{MDC1} %m">
<PatternLayout header="%n
===================================%n
MDC1HEADER=%X{MDC1}%n
===================================%n" pattern="%-5p %c (%F:%L) %d{dd.MM.yyyy
HH:mm:ss} %m MDC1=%X{MDC1}%ex%n" />
</SMTP>
<Async name="mail-async" includeLocation="true">
<AppenderRef ref="sync-mail" />
</Async>
{noformat}
a simple:
{noformat}
ThreadContext.put("MDC1", "***testmdc***");
log.error("test message");
{noformat}
which goes directly to the sync-mail appender leads to the following result:
{noformat}
subject: MDCSUBJECT***testmdc*** test message
body:
===================================
MDC1HEADER=***testmdc***
===================================
{noformat}
as you can see the ThreadContext value is replace in both the subject (built
with the "pattern" attribute of the appender) and the body of the email,
generated using the "header" layout attribute.
Doing the same though the "mail-async" appender leads instead to the following
result:
{noformat}
subject: MDCSUBJECT***testmdc*** test message
body:
===================================
MDC1HEADER=
===================================
{noformat}
As you can see the subject of the email is still handled property (the
ThreadContext value has been filled although the message has been sent by a
separate thread) but the body of the email has lost any ThreadContext value. I
actually couldn't find any way at the moment to preserve ThreadContext values
in header/footer without keeping the smtp appender synchronous.
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