kaisun2000 commented on a change in pull request #339: Implementation of 
stateModelDef modification in REST 2.0
URL: https://github.com/apache/helix/pull/339#discussion_r306529981
 
 

 ##########
 File path: 
helix-rest/src/main/java/org/apache/helix/rest/server/resources/helix/ClusterAccessor.java
 ##########
 @@ -416,24 +418,104 @@ public Response 
getClusterStateModelDefinitions(@PathParam("clusterId") String c
     return JSONRepresentation(clusterStateModelDefs);
   }
 
-  @GET
-  @Path("{clusterId}/maintenance")
-  public Response getClusterMaintenanceMode(@PathParam("clusterId") String 
clusterId) {
-    return JSONRepresentation(
-        ImmutableMap.of(ClusterProperties.maintenance.name(), 
getHelixAdmin().isInMaintenanceMode(clusterId)));
-  }
-
   @GET
   @Path("{clusterId}/statemodeldefs/{statemodel}")
   public Response getClusterStateModelDefinition(@PathParam("clusterId") 
String clusterId,
       @PathParam("statemodel") String statemodel) {
     HelixDataAccessor dataAccessor = getDataAccssor(clusterId);
-    StateModelDefinition stateModelDef =
-        
dataAccessor.getProperty(dataAccessor.keyBuilder().stateModelDef(statemodel));
+    StateModelDefinition stateModelDef = 
dataAccessor.getProperty(dataAccessor.keyBuilder().stateModelDef(statemodel));
 
+    if (stateModelDef == null) {
+      return notFound();
 
 Review comment:
   will do.

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