The request to API call datastore_v3.Put() was too large

Question

I am using google cloud sql with appengine.

I am getting com.google.apphosting.api.ApiProxy$RequestTooLargeException: The request to API call datastore_v3.Put() wa

Answer 1

This happens because of GAE sessions, which under the hood use GAE Datastore to save session objects. This exception is thrown if more than 1Mb data is stored in session.