Nick Dimiduk created HBASE-26906:
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             Summary: Remove duplicate dependency declaration
                 Key: HBASE-26906
                 URL: https://issues.apache.org/jira/browse/HBASE-26906
             Project: HBase
          Issue Type: Task
          Components: build
            Reporter: Nick Dimiduk
            Assignee: Nick Dimiduk


On branch-2 derivatives, I noticed on PR builds of JDK11+Hadoop3 that running 
tests with {{-pl}} results in a warning from maven

{noformat}
[WARNING]                                                                       
                                                                                
                                            
[WARNING] Some problems were encountered while building the effective model for 
org.apache.hbase:hbase-build-configuration:pom:2.6.0-SNAPSHOT                   
                                            
[WARNING] 
'profiles.profile[hadoop-3.0].dependencyManagement.dependencies.dependency.(groupId:artifactId:type:classifier)'
 must be unique: org.apache.hadoop:hadoop-mapreduce-client-app:test-jar -> 
duplica
te declaration of version ${hadoop-three.version} @ 
org.apache.hbase:hbase:2.6.0-SNAPSHOT, 
/Users/ndimiduk/repos/apache/hbase/pom.xml, line 3816, column 23                
                                 
[WARNING]                                                                       
                                                                                
                                            
[WARNING] Some problems were encountered while building the effective model for 
org.apache.hbase:hbase:pom:2.6.0-SNAPSHOT                                       
                                            
[WARNING] 
'profiles.profile[hadoop-3.0].dependencyManagement.dependencies.dependency.(groupId:artifactId:type:classifier)'
 must be unique: org.apache.hadoop:hadoop-mapreduce-client-app:test-jar -> 
duplica
te declaration of version ${hadoop-three.version} @ line 3816, column 23        
                                                                                
                                            
[WARNING]                                                                       
                                                                                
                                            
[WARNING] It is highly recommended to fix these problems because they threaten 
the stability of your build.                                                    
                                             
[WARNING]                                                                       
                                                                                
                                            
[WARNING] For this reason, future Maven versions might no longer support 
building such malformed projects.                                               
                                                   
[WARNING] 
{noformat}

I _think_ they're harmless, but we should clean them up.



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