Add hashCode and equals to DruidNode

server/src/main/java/io/druid/server/DruidNode.java

@@ -156,4 +156,35 @@ public String toString()
            ", port=" + port +
            '}';
   }
+
+  @Override
+  public boolean equals(Object o)
+  {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+
+    DruidNode node = (DruidNode) o;
+
+    if (port != node.port) {
+      return false;
+    }
+    if (!serviceName.equals(node.serviceName)) {
+      return false;
+    }
+    return host.equals(node.host);
+
+  }
+
+  @Override
+  public int hashCode()
+  {
+    int result = serviceName.hashCode();
+    result = 31 * result + host.hashCode();
+    result = 31 * result + port;
+    return result;
+  }
 }

server/src/test/java/io/druid/server/DruidNodeTest.java

@@ -114,4 +114,30 @@ public void testConflictingPortsNonsense() throws Exception
   {
     new DruidNode("test/service", "[2001:db8:85a3::8a2e:370:7334]:123", 456);
   }
+
+  @Test
+  public void testEquals() throws Exception
+  {
+    final String serviceName = "serviceName";
+    final String host = "some.host";
+    final int port = 9898;
+    Assert.assertEquals(new DruidNode(serviceName, host, port), new DruidNode(serviceName, host, port));
+    Assert.assertNotEquals(new DruidNode(serviceName, host, port), new DruidNode(serviceName, host, -1));
+    Assert.assertNotEquals(new DruidNode(serviceName, host, port), new DruidNode(serviceName, "other.host", port));
+    Assert.assertNotEquals(new DruidNode(serviceName, host, port), new DruidNode("otherServiceName", host, port));
+  }
+
+  @Test
+  public void testHashCode() throws Exception
+  {
+
+    final String serviceName = "serviceName";
+    final String host = "some.host";
+    final int port = 9898;
+    Assert.assertEquals(new DruidNode(serviceName, host, port).hashCode(), new DruidNode(serviceName, host, port).hashCode());
+    // Potential hash collision if hashCode method ever changes
+    Assert.assertNotEquals(new DruidNode(serviceName, host, port).hashCode(), new DruidNode(serviceName, host, -1).hashCode());
+    Assert.assertNotEquals(new DruidNode(serviceName, host, port).hashCode(), new DruidNode(serviceName, "other.host", port).hashCode());
+    Assert.assertNotEquals(new DruidNode(serviceName, host, port).hashCode(), new DruidNode("otherServiceName", host, port).hashCode());
+  }
 }