Why do you put all nodes for a device in one entity group (same parent node)? Entity groups should be kept small (in most cases) because you lock all members of the group if you do a put() on one of them. Only use entity groups if you need some transaction function to do the update on some of the group members or you need the parent / grandparent relation. All members of an entity group are stored on the same Bigtable "disk" (no possibility for distributed storage for members in an entity group).
Why don't you add a ReferenceProperty to the node class? [1] This property references the device object you now set as parent. For a query you now select on this ReferenceProperty instead of selecting for parent. This is what the back-reference property is doing behind the scene, construct a Query object that filters on the ReferenceProperty. [1] http://code.google.com/appengine/docs/python/datastore/entitiesandmodels.html#References --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
