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https://issues.apache.org/jira/browse/SOLR-7887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15311183#comment-15311183
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Keith Laban commented on SOLR-7887:
-----------------------------------
If you notice the first note here
https://logging.apache.org/log4j/2.0/manual/migration.html
bq. They must not access methods and classes internal to the Log4j 1.x
implementation such as Appenders, LoggerRepository or Category's callAppenders
method.
Unfortunately, hdfs extends {{AppenderSkeleton}} which violates this rule
causing the bridge solution not to work.
As far as I can tell there are only two soltuions:
# continue to bring in bring in log4j 1.2 -- I think all of the packages have
changed in the upgrade so that should hopefully work
# hdfs/hadoop needs to upgrade to log4j2
Not sure what other options there are
> 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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