I guess that the limit is enormous. (That doesn't help you since you want to actually know!)
Of course, you can only add entities to your entity group at a certain rate of transactions per unit time. This is a constraint on how the number of entities in any given entity group increases over time. On Oct 21, 5:31 pm, Didier Durand <[email protected]> wrote: > Hi, > > 1 info that is important to reach the value for this max number (if > it exists) is the size of the entities: the bigger they are, the > faster you will occupy the bandwith between the BigTable server and > the processing server. > > So, if you want to go fast, you have to spread entities among many > servers: see the end of this paper to see the trade-offs > ->http://labs.google.com/papers/bigtable.html > > didier > > On Oct 21, 5:00 pm, "nicanor.babula" <[email protected]> wrote: > > > Thank you all for your responses. > > @alesj > > No, I am not confusing entity "group" with the actual entities stored > > in the datastore. > > > @Ian Marshall > > Actually no, because I already did that kind of analysis. > > > I have to use transactions in order to maintain data consistency and > > therefore I have to define the right entity groups. I already thought > > of a solution, just that I have read in the docs that is not > > recommended to put too many entities in an entity group. So: What is > > the number of child entities a parent entity can have, past which the > > datastore becomes slow? Hundreds? Thousands? Millions? > > I also understand that all entities in an entity group are stored on > > the same node of the datastore's distributed system and therefore I > > understand that if the number of entities an entity group has is too > > big, the queries will become slow, because will be processed by a > > single node. Right? > > Again: Which is that number? > > > Thanks and sorry if I bored you with my long email. ;) > > > On 21 Ott, 14:59, Ian Marshall <[email protected]> wrote: > > > > How about my comments below? > > > >http://www.google.com/url?url=http://groups.google.com/g/f907f736/t/f... > > > > Do they help you? > > > > On Oct 20, 6:39 pm, "nicanor.babula" <[email protected]> wrote: > > > > > Hi everbody, > > > > > I have a question regarding the datastore best-practices. > > > > > The appengine's official documentation says that is not a good > > > > practice to put too many entities in the same entity group. What does > > > > "too many" mean in this case? Hundreds? Thousands? Milions? > > > > > Thanks in advance, > > > > Cristian Babula. > > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
