HADOOP-12761. incremental maven build is not really incremental (sjlee)

(cherry picked from commit 4dc0a3949386ce2961356143a5a843dd537829dc)

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

@@ -45,6 +45,8 @@ Release 2.7.3 - UNRELEASED
     HADOOP-12706. TestLocalFsFCStatistics#testStatisticsThreadLocalDataCleanUp
     times out occasionally (Sangjin Lee and Colin Patrick McCabe via jlowe)
 
+    HADOOP-12761. incremental maven build is not really incremental (sjlee)
+
 Release 2.7.2 - 2016-01-25
 
   INCOMPATIBLE CHANGES

hadoop-project/pom.xml

@@ -961,6 +961,7 @@
           <configuration>
             <source>${javac.version}</source>
             <target>${javac.version}</target>
+            <useIncrementalCompilation>false</useIncrementalCompilation>
           </configuration>
         </plugin>
         <plugin>