HADOOP-12859. Disable hiding field style checks in class setters. Contributed by Kai Zheng.

hadoop-build-tools/src/main/resources/checkstyle/checkstyle.xml

@@ -158,6 +158,7 @@
         <module name="EqualsHashCode"/>
         <module name="HiddenField">
           <property name="ignoreConstructorParameter" value="true"/>
+          <property name="ignoreSetter" value="true"/>
         </module>
         <module name="IllegalInstantiation"/>
         <module name="InnerAssignment"/>

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -698,6 +698,8 @@ Release 2.9.0 - UNRELEASED
     HADOOP-10321. TestCompositeService should cover all enumerations of 
     adding a service to a parent service. (Ray Chiang via kasha)
 
+    HADOOP-12859. Disable hiding field style checks in class setters. (Kai Zheng via wang)
+
   BUG FIXES
 
     HADOOP-12605. Fix intermittent failure of TestIPC.testIpcWithReaderQueuing