Shilun Fan created HDFS-17971:
---------------------------------

             Summary: Fix RAT check failure for vendored JSON.java in 
hadoop-hdfs-rbf
                 Key: HDFS-17971
                 URL: https://issues.apache.org/jira/browse/HDFS-17971
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: rbf
    Affects Versions: 3.5.1, 3.6.0
            Reporter: Shilun Fan
            Assignee: Shilun Fan


The Apache RAT check fails in the hadoop-hdfs-rbf module because
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/metrics/JSON.java
is reported as an unapproved license file.
 
This class was copied from Jetty and intentionally retains its original dual 
EPL/Apache license header. The file is already documented in LICENSE.txt and 
excluded from the root-level RAT check.
 
However, hadoop-hdfs-rbf defines its own RAT exclusion list in its module POM.
The module-level configuration does not include JSON.java, so the following 
command fails:
 
./mvnw -pl hadoop-hdfs-project/hadoop-hdfs-rbf \
-DskipTests apache-rat:check
 
The RAT report contains:
Unapproved: 1, unknown: 1

The unapproved file is:
src/main/java/org/apache/hadoop/hdfs/server/federation/metrics/JSON.java
 
We should add this file to the RAT exclusion list in
hadoop-hdfs-project/hadoop-hdfs-rbf/pom.xml.
 
This change should not modify the original license header in JSON.java.
This issue is a follow-up to HADOOP-19951 and apache/hadoop#8654.



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