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From "Keith Laban (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-7887) Upgrade Solr to use log4j2 -- log4j 1 now officially end of life
Date Wed, 01 Jun 2016 21:38:59 GMT

    [ https://issues.apache.org/jira/browse/SOLR-7887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15311183#comment-15311183
] 

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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