EUREKA-1087 Add config parameter eureka.myUrl to specify URL Eureka s…

…hould treat as its own (for cases when each Eureka node is behind LB and does not simply check replica URLs against own IP/host)

eureka-core/src/main/java/com/netflix/eureka/DefaultEurekaServerConfig.java

@@ -88,6 +88,8 @@ public class DefaultEurekaServerConfig implements EurekaServerConfig {
     private final DynamicStringProperty listAutoScalingGroupsRoleName =
             configInstance.getStringProperty(namespace + "listAutoScalingGroupsRoleName", "ListAutoScalingGroups");
 
+    private final DynamicStringProperty myUrl = configInstance.getStringProperty(namespace + "myUrl", null);
+
     public DefaultEurekaServerConfig() {
         init();
     }
@@ -600,6 +602,11 @@ public boolean shouldBatchReplication() {
         return configInstance.getBooleanProperty(namespace + "shouldBatchReplication", false).get();
     }
 
+    @Override
+    public String getMyUrl() {
+        return myUrl.get();
+    }
+
     @Override
     public boolean shouldLogIdentityHeaders() {
         return configInstance.getBooleanProperty(namespace + "auth.shouldLogIdentityHeaders", true).get();

eureka-core/src/main/java/com/netflix/eureka/EurekaServerConfig.java

@@ -582,6 +582,16 @@ public interface EurekaServerConfig {
      */
     boolean shouldBatchReplication();
 
+    /**
+     * Allows to configure URL which Eureka should treat as its own during replication. In some cases Eureka URLs don't
+     * match IP address or hostname (for example, when nodes are behind load balancers). Setting this parameter on each
+     * node to URLs of associated load balancers helps to avoid replication to the same node where event originally came
+     * to. Important: you need to configure the whole URL including scheme and path, like
+     * <code>http://eureka-node1.mydomain.com:8010/eureka/v2/</code>
+     * @return URL Eureka will treat as its own
+     */
+    String getMyUrl();
+
     /**
      * Indicates whether the eureka server should log/metric clientAuthHeaders
      * @return {@code true} if the clientAuthHeaders should be logged and/or emitted as metrics

eureka-core/src/main/java/com/netflix/eureka/cluster/PeerEurekaNodes.java

@@ -233,6 +233,10 @@ public static boolean isThisMe(String url) {
      *         replicate, false otherwise.
      */
     public boolean isThisMyUrl(String url) {
+        final String myUrlConfigured = serverConfig.getMyUrl();
+        if (myUrlConfigured != null) {
+            return myUrlConfigured.equals(url);
+        }
         return isInstanceURL(url, applicationInfoManager.getInfo());
     }