GAE 数据存储在内部使用内存缓存吗？
Does GAE datastore internally use memcache?
正如您从随附的屏幕截图中看到的那样，数据存储要求内存缓存删除 put() 中的一个条目。那是什么？
至少 ndb 数据存储缓存 include memcache:
您观察到的模式可以在本节中解释：
Memcache does not support transactions. Thus, an update meant to be
applied to both the Datastore and memcache might be made to only one
of the two. To maintain consistency in such cases (possibly at the
expense of performance), the updated entity is deleted from memcache
and then written to the Datastore.
正如您从随附的屏幕截图中看到的那样，数据存储要求内存缓存删除 put() 中的一个条目。那是什么？
至少 ndb 数据存储缓存 include memcache:
您观察到的模式可以在本节中解释：
Memcache does not support transactions. Thus, an update meant to be applied to both the Datastore and memcache might be made to only one of the two. To maintain consistency in such cases (possibly at the expense of performance), the updated entity is deleted from memcache and then written to the Datastore.