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http://jira.qos.ch/browse/LBCLASSIC-264?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ceki Gulcu reassigned LBCLASSIC-264:
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Assignee: Ceki Gulcu (was: Logback dev list)
> MDC of parent thread can be wiped from child thread
> ---------------------------------------------------
>
> Key: LBCLASSIC-264
> URL: http://jira.qos.ch/browse/LBCLASSIC-264
> Project: logback-classic
> Issue Type: Bug
> Affects Versions: 0.9.28
> Reporter: Iwein Fuld
> Assignee: Ceki Gulcu
>
> In our web framework we're using the MDC, but because we use multiple
> rendering threads we need to copy context from one thread to another. With
> log4j this worked fine, with logback it doesn't. It seems that there is an
> issue at least with setContextMap, which can influence the MDC in other (non
> child) threads.
> I've reproduced one such issue in a small project:
> https://github.com/iwein/logback-testdrive
> Look at this testcase in particular:
> {code}
> @Test
> public void shouldCopyContextToOtherThread() throws Exception {
> final AtomicReference<Map> contextMap = new AtomicReference<Map>();
> MDC.put("first", "Dorothy");
> MDC.put("last", "Parker");
> contextMap.set(MDC.getCopyOfContextMap());
> //some context is set in a different thread
> Executors.newSingleThreadExecutor().execute(new Runnable() {
> public void run() {
> //not needed, but shouldn't break anything in the parent
> right?
> MDC.setContextMap(contextMap.get());
> logger.info("Check enclosed.");
> }
> });
> //If I don't do this I have lost my context. That seems wrong..
> //MDC.setContextMap(contextMap.get());
> logger.debug("The most beautiful two words in English.");
> }
> {code}
> I'll try to reproduce the issue with some sibling threads for the heck of it,
> but I think the above already illustrates the problem.
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