SiftingAppenders MDCBasedDiscriminator does not support deferred processing of LoggingEvents -------------------------------------------------------------------------------------------- Key: LBCLASSIC-213 URL: http://jira.qos.ch/browse/LBCLASSIC-213 Project: logback-classic Issue Type: Bug Components: appender Affects Versions: 0.9.21 Reporter: Torsten Juergeleit Assignee: Logback dev list In MDCBasedDiscriminator.getDiscriminatingValue() the MDC of the current thread is referenced: public String getDiscriminatingValue(ILoggingEvent event) { String mdcValue = MDC.get(key); if (mdcValue == null) { return defaultValue; } else { return mdcValue; } } This doesn't work is the logging events are serialized and processed in a different thread or JVM. Instead using SLF4Js MDC class why not using ILoggingEvent.getMdc() to access the MDC or a serialized version of it? Maybe something like this: public String getDiscriminatingValue(ILoggingEvent event) { if (event != null) { String mdcValue = event.getMdc().get(getKey()); if (mdcValue != null) { return mdcValue; } } return getDefaultValue(); } Right now we have to workaround this by creating our own version of DeferedMDCBasedDiscriminator :-( Some like this: public class DeferedMDCBasedDiscriminator extends MDCBasedDiscriminator { public String getDiscriminatingValue(ILoggingEvent event) { if (event != null) { String mdcValue = event.getMdc().get(getKey()); if (mdcValue != null) { return mdcValue; } } return getDefaultValue(); } } -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://jira.qos.ch/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira