cloud endpoints slower than rpc, but not with DevAppServer

Question

My android app is accessing just a single object (each containing a couple of short lists) from Objectify, but I'm getting delays of up to 15 seconds. I never get such delays using rpc in my web app to get the same objects, nor when I access the blobstore, either with android or a browser app. I thought this could be related to JSON parsing as discussed here : JSON parsing very slow in Google Cloud Endpoints but in that case we'd expect similar delays with the DevAppServer wouldn't we ?

Here's the endpoints code in the GAE app:

The Endpoint class is based on that auto-generated by GPE, minus all JDO/JPA related code

@Api(name = "myclassendpoint",namespace = @ApiNamespace(ownerDomain = "timmacp.com",ownerName = "timmacp.com", packagePath = "endpoints_in_android_app"))
public class MyClassEndpoint {

@ApiMethod(name = "getMyClassObjectByID")
public MyClass getMyClassObjectByID(@Named("id") String id) {

    MyClass object=ofy().load().type(MyClass.class)     
                    .id(EndpointUtils.URLdecode(id)).get();
    return object;
}

In the android app, I create a new EndpointsTask (extends AsyncTask) for each button press & all calls to Endpoint class are in doInBackground(..) called via execute().

First create the endpoint:

    MyClassendpoint endpoint;

    MyClassendpoint.Builder endpointBuilder = new MyClassendpoint.Builder(
            AndroidHttp.newCompatibleTransport(), new com.google.api.client.json.jackson2.JacksonFactory(),
            new HttpRequestInitializer() {
                public void initialize(HttpRequest httpRequest) {
                }
            });

    endpointBuilder=CloudEndpointUtils.updateBuilder(endpointBuilder);
    endpoint =endpointBuilder.build();

Then test with:

endpoint.getMyClassObjectByID("object1").execute();

By RPC in web app, do you mean still accessing via an Endpoints API, or do you mean using your own custom RPCs? — saiyr
@saiyr Thanks for your interest. Its an RPC written in GWT, which compiles into Javascript. Its standard way to access Objectify objects in GWT, no endpoints api — timmacp
If you happen to have a test Endpoints call that demonstrated the slowness, that could be helpful! — saiyr
@saiyr Here's the code. I tested this again today and now only the first call to get an object is slow, and this is consistent. 2 days ago I was getting long delays for maybe 25% of calls, yet blobstore calls were reliably fast. — timmacp

Jun Yang Jun Yang · Accepted Answer · 2014-08-04T17:04:59

Please see this thread for more information:

https://groups.google.com/forum/#!topic/google-appengine/3XGJFaosX9s

We are working on eliminating the need for warm-up (i.e. the first request to your API will cause the warm-up to be

cloud endpoints slower than rpc, but not with DevAppServer

1 Answers