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https://issues.apache.org/jira/browse/HADOOP-16206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17692255#comment-17692255
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Viraj Jasani commented on HADOOP-16206:
---------------------------------------

For sub-task HADOOP-18631, PR is ready for review.

A short summary:
 * Migrating Async appenders from code to log4j properties for namenode audit 
logger as well as datanode/namenode metric loggers
 * Provided sample log4j properties on how we can configure AsyncAppender to 
wrap RFA for the loggers
 * Incompatible change as three hdfs-site configs are no longer in use, they 
are to be replaced with log4j properties. Deprecated them, added javadoc and 
log to indicate the log4j replacement rather than relying on the configs. The 
configs: 
 ** dfs.namenode.audit.log.async
 ** dfs.namenode.audit.log.async.blocking
 ** dfs.namenode.audit.log.async.buffer.size
 * namenode audit logger as well as datanode/namenode metric loggers now use 
SLF4J logger rather than log4j logger directly

 

Requesting the review on [https://github.com/apache/hadoop/pull/5418]

> Migrate from Log4j1 to Log4j2
> -----------------------------
>
>                 Key: HADOOP-16206
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16206
>             Project: Hadoop Common
>          Issue Type: Task
>    Affects Versions: 3.3.0
>            Reporter: Akira Ajisaka
>            Assignee: Duo Zhang
>            Priority: Major
>         Attachments: HADOOP-16206-wip.001.patch
>
>
> This sub-task is to remove log4j1 dependency and add log4j2 dependency.



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