[ https://issues.apache.org/jira/browse/TEZ-2222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16653912#comment-16653912 ] 

Jonathan Eagles commented on TEZ-2222:
--------------------------------------

This is still being considered. However, there is some Hadoop dependencies and support to consider. HADOOP-12956 references many of the difficulties including log4j12 broken in jdk9 as well as running log4j12 and log4j2 simultaneously being a problem. We will want to coordinate with the community.

> Investigate moving to log4j2 for logging
> ----------------------------------------
>
>                 Key: TEZ-2222
>                 URL: https://issues.apache.org/jira/browse/TEZ-2222
>             Project: Apache Tez
>          Issue Type: Improvement
>            Reporter: Siddharth Seth
>            Priority: Blocker
>
> Via slf4j.
> Some bits to keep in mind
> - We have explicit code which rotates logs using direct log4j12 APIs. This should keep working. I believe the log4j2 APIs are different here
> - API compatibility between log4j12 / log4j2 can be problematic - if both end up on the classpath (I believe the APIs are different)
> - Hadoop dist includes a slf4j-log4j12 binding. Changing the default can result in sl4j-log4j12 and slf4j-log4j2 to co-exist by default - which could be problematic. Needs investigation.
> End of the day, we will likely need an option to use either of the two.



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