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.
