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https://issues.apache.org/jira/browse/SOLR-7887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15212210#comment-15212210
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Jeff Wartes commented on SOLR-7887:
-----------------------------------
SOLR-7698 and SOLR-6377 both have attempts at logback watchers, I think.
I'll also second the desire for async appenders, and I'd go further to suggest
it as the default. Solr does a lot of logging, and this gets that work out of
the critical path for query latency.
> Upgrade Solr to use log4j2 -- log4j 1 now officially end of life
> ----------------------------------------------------------------
>
> Key: SOLR-7887
> URL: https://issues.apache.org/jira/browse/SOLR-7887
> Project: Solr
> Issue Type: Task
> Affects Versions: 5.2.1
> Reporter: Shawn Heisey
>
> The logging services project has officially announced the EOL of log4j 1:
> https://blogs.apache.org/foundation/entry/apache_logging_services_project_announces
> In the official binary jetty deployment, we use use log4j 1.2 as our final
> logging destination, so the admin UI has a log watcher that actually uses
> log4j and java.util.logging classes. That will need to be extended to add
> log4j2. I think that might be the largest pain point to this upgrade.
> There is some crossover between log4j2 and slf4j. Figuring out exactly which
> jars need to be in the lib/ext directory will take some research.
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