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https://issues.apache.org/jira/browse/HADOOP-16717?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Akira Ajisaka updated HADOOP-16717:
-----------------------------------
    Fix Version/s: 3.3.0
     Hadoop Flags: Reviewed
       Resolution: Fixed
           Status: Resolved  (was: Patch Available)

Committed to trunk.

> Remove GenericsUtil isLog4jLogger dependency on Log4jLoggerAdapter
> ------------------------------------------------------------------
>
>                 Key: HADOOP-16717
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16717
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 3.2
>            Reporter: David Mollitor
>            Assignee: Xieming Li
>            Priority: Major
>             Fix For: 3.3.0
>
>         Attachments: HADOOP-16717.001.patch, HADOOP-16717.002.patch, 
> HADOOP-16717.003.patch
>
>
> Remove this method:
> {code:java}
>   /**
>    * Determine whether the log of <code>clazz</code> is Log4j implementation.
>    * @param clazz a class to be determined
>    * @return true if the log of <code>clazz</code> is Log4j implementation.
>    */
>   public static boolean isLog4jLogger(Class<?> clazz) {
>     if (clazz == null) {
>       return false;
>     }
>     Logger log = LoggerFactory.getLogger(clazz);
>     return log instanceof Log4jLoggerAdapter;
>   }
> {code}
> This creates a dependency on Log4jLoggerAdapter (slf4j-log4j12) which means 
> that any project which depends on hadoop-commons needs to carry this 
> dependency as well.  Such a simple use case and such a heavy dependency.  The 
> commons library should not depend on any specific implementation of SLF4J 
> binding



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