YARN-6628. Unexpected jackson-core-2.2.3 dependency introduced. Contributed by Jonathan Eagles

hadoop-assemblies/src/main/resources/assemblies/hadoop-yarn-dist.xml

@@ -215,6 +215,8 @@
       <!-- Exclude hadoop artifacts. They will be found via HADOOP* env -->
       <excludes>
         <exclude>org.apache.hadoop:*</exclude>
+        <!-- Exclude shaded jackson jars to avoid leaking new dependencies -->
+        <exclude>com.fasterxml.jackson.core:*</exclude>
         <!-- use slf4j from common to avoid multiple binding warnings -->
         <exclude>org.slf4j:slf4j-api</exclude>
         <exclude>org.slf4j:slf4j-log4j12</exclude>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-applicationhistoryservice/pom.xml

@@ -239,6 +239,36 @@
           </execution>
         </executions>
       </plugin>
+      <!-- Shade the jackson classes -->
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-shade-plugin</artifactId>
+        <version>2.4.3</version>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>shade</goal>
+            </goals>
+            <configuration>
+              <relocations>
+                <relocation>
+                  <pattern>com.fasterxml.jackson</pattern>
+                  <shadedPattern>org.apache.hadoop.shaded.$0</shadedPattern>
+                </relocation>
+              </relocations>
+              <artifactSet>
+                <includes>
+                  <include>com.fasterxml.jackson.core:*</include>
+                </includes>
+              </artifactSet>
+              <transformers>
+                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
+              </transformers>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
     </plugins>
   </build>
 </project>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timeline-pluginstorage/pom.xml

@@ -132,10 +132,6 @@
       <artifactId>mockito-all</artifactId>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>com.fasterxml.jackson.core</groupId>
-      <artifactId>jackson-databind</artifactId>
-    </dependency>
   </dependencies>
 
   <build>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timeline-pluginstorage/src/main/java/org/apache/hadoop/yarn/server/timeline/LevelDBCacheTimelineStore.java

@@ -18,7 +18,7 @@
 
 package org.apache.hadoop.yarn.server.timeline;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
+import org.codehaus.jackson.map.ObjectMapper;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience.Private;