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https://issues.apache.org/jira/browse/SOLR-7887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16198964#comment-16198964
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Shawn Heisey commented on SOLR-7887:
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While looking into SOLR-11453, I attempted to get help from the log4j mailing
list on creating a configuration to low slow queries to a separate file.
Their response was basically "log4j1 is end of life, upgrade and we might be
able to help." This isn't really very helpful, but it's also a completely
understandable position, so I'm looking at this issue again.
I see that we have a WIP patch for implementing a new logwatcher, but I haven't
looked at it closely yet. If anyone who's looked at this upgrade has any
helpful advice, please let me know.
> 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
> Attachments: SOLR-7887-WIP.patch
>
>
> 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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