Hi, yeah I have watched that video numerous times, and I never quite
got where he says 'this will solve the million fan out problem' and
then goes on to say that you cant have more than 5000 values in a
listproperty. but i get what you are saying, just somehow manage
multiple 'relationship entities' per user entity. But is that going
to solve my particular example query?
If I do this (below) Im still stumped on how to answer my question
without pulling a potentially large number of keys into memory and
filtering them in memory.
USER
ListOfBooksIveReadLists
ListOfMyFriendsLists
BOOKSIVEREAD: (child of User)
booksList
MYFRIENDS: (child of user)
friendList
On Jul 8, 5:31 am, Darien Caldwell <darien.caldw...@gmail.com> wrote:
> On Jul 6, 10:58 pm, stefoid <stevenmath...@yahoo.com> wrote:
>
> > But due to the large number of BOOKS that could be read by a USER,
> > and the large number of USERS who could be my friend, I cant
> > practically model BOOKS READ BY USERS and USERS WHO ARE MY FRIEND as
> > ListProperties...
>
> > ...Because I would blow the 5000 index limit per entity, because each
> > value of ListPropery generates its own index entry. Is that correct?
>
> you can have multiple ListProperty Entities per User, all in the same
> entity group. When you query, it will return a key if, say, the BOOK
> is in any of the associated lists. This is how I handle it. If one
> list approaches 5000 entries, I just spawn a new related list and
> start filling it instead.
>
> I really recommend you watch this I/O presentation closely. It
> basically spells out how to do this (better than I could hope to
> explain)http://sites.google.com/site/io/building-scalable-web-applications-wi...
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