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https://issues.apache.org/jira/browse/HADOOP-18931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17854945#comment-17854945
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ASF GitHub Bot commented on HADOOP-18931:
-----------------------------------------

virajjasani commented on PR #6197:
URL: https://github.com/apache/hadoop/pull/6197#issuecomment-2167335766

   My bad, i misunderstood this earlier. The recommendation was to use 
`assertj-core` jar location to test test ClassUtil functions (rather than using 
log4j jar location), i was under the impression that the recommendation was to 
use assertj for all assertions in the test class.
   
   Latest revision: using assertj-core jar location to test ClassUtil 
functions, so that even if log4j implementation changes, the tests should not 
be impacted.




> FileSystem.getFileSystemClass() to log at debug the jar the .class came from
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-18931
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18931
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 3.3.6
>            Reporter: Steve Loughran
>            Priority: Minor
>              Labels: pull-request-available
>
> we want to be able to log the jar the filesystem implementation class, so 
> that we can identify which version of a module the class came from.
> this is to help track down problems where different machines in the cluster 
> or the .tar.gz bundle is out of date. 



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