APEXCORE-700 Add Evolving annotations for classes changed through 9856080ed
diff --git a/engine/src/main/java/org/apache/apex/engine/api/plugin/DAGExecutionPlugin.java b/engine/src/main/java/org/apache/apex/engine/api/plugin/DAGExecutionPlugin.java
index 7cfb1fa..a9722ac 100644
--- a/engine/src/main/java/org/apache/apex/engine/api/plugin/DAGExecutionPlugin.java
+++ b/engine/src/main/java/org/apache/apex/engine/api/plugin/DAGExecutionPlugin.java
@@ -23,6 +23,7 @@
 import java.util.Queue;
 
 import org.apache.apex.api.plugin.Plugin;
+import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.conf.Configuration;
 
 import com.datatorrent.api.DAG;
@@ -44,6 +45,7 @@
  * </ul>
  *
  */
+@InterfaceStability.Evolving
 public interface DAGExecutionPlugin<T extends DAGExecutionPlugin.Context> extends Plugin<T>
 {
 
@@ -58,6 +60,7 @@
    * </ul>
    *
    */
+  @InterfaceStability.Evolving
   interface Context<E extends DAGExecutionEvent> extends PluginContext<DAGExecutionEvent.Type, E>
   {
     VersionInfo getEngineVersion();