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https://issues.apache.org/jira/browse/HADOOP-17315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17217954#comment-17217954
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Ahmed Hussein commented on HADOOP-17315:
----------------------------------------

Hey [~aajisaka], thanks for working on this patch.

The guava enforcer rules were introduced to warn against increasing the 
reliance on guava classes; specifically to prevent the new patches from 
re-introducing code that was already "un-guaved".

{code:xml}
          <property name="illegalClasses"
            
value="^com\.google\.common\.base\.(Optional|Function|Predicate|Supplier), 
^com\.google\.common\.collect\.(ImmutableListMultimap)"/>
{code}

After merging that patch, the rules are only checking for imports that start 
with com.google. Introducing shading, the regex becomes obsolete because the 
packages have a different prefix {{org.apache.hadoop.thirdparty.*}}.
I suggested that rules are modified to make sure that those guava classes are 
not used in Hadoop code.

> Use shaded guava in ClientCache.java
> ------------------------------------
>
>                 Key: HADOOP-17315
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17315
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: build
>            Reporter: Akira Ajisaka
>            Assignee: Akira Ajisaka
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 3.4.0
>
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
> After HADOOP-17288, we should use shaded guava.



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