Erick Erickson created SOLR-13959:
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             Summary: Upgrade log4j2 to the current version, presently 2.12.1 
                 Key: SOLR-13959
                 URL: https://issues.apache.org/jira/browse/SOLR-13959
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
          Components: logging
            Reporter: Erick Erickson


First, we still have some interesting logging bleed leaks that we can't account 
for, it's always possible anyway and I'm an optmist

Second, there's a long discussion about leaked threads (albeit under Tomcat) 
and some vague references to rethinking how threads are handled in Log4J2. We 
already have a hack to not fail on leaked logger threads in our tests, perhaps 
this will address that need.

Third, "Version 2.12.0 introduces support for accessing Docker container 
information " which may be increasingly interesting.

I won't get to this soon, so anyone who wants to pick it up please do.



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