Xiaoqiao He created HADOOP-17329:
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             Summary: mvn site fails due to MetricsSystemImpl class
                 Key: HADOOP-17329
                 URL: https://issues.apache.org/jira/browse/HADOOP-17329
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Xiaoqiao He


When prepare for branch-3.2.2 release, i found there is one issue while create 
release. And it also exist in trunk.
command line: mvn install site site:stage -DskipTests -DskipShade -Pdist,src 
-Preleasedocs,docs
failed log show as the following: 
{quote}[ERROR] Failed to execute goal 
org.apache.maven.plugins:maven-site-plugin:3.6:site (default-site) on project 
hadoop-common: failed to get report for 
org.apache.maven.plugins:maven-dependency-plugin: Failed to execute goal 
org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on 
project hadoop-common: Compilation failure
[ERROR] 
/Users/hexiaoqiao/Source/hadoop-common/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/impl/MetricsSystemImpl.java:[298,5]
 method <T>register(java.lang.String,java.lang.String,T) is already defined in 
class org.apache.hadoop.metrics2.impl.MetricsSystemImpl{quote}

I am not sure why source code of class MetricsSystemImpl will be changed while 
building, I try to revert HADOOP-17081 everything seems OK.



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