Thanks for your explanation Michael and Ted :-) Best, tison.
Ted Dunning <ted.dunn...@gmail.com> 于2019年8月15日周四 下午1:22写道： > As Michael correctly said, isolation only makes sense when you allow > concurrent queries. Of the four ACID properties, the multi op satisfies A, > C and D while I is essentially irrelevant (or could be said to be trivially > satisfied since there are no concurrent queries. > > > On Wed, Aug 14, 2019 at 6:45 PM Zili Chen <wander4...@gmail.com> wrote: > > > Thanks for your reply Ted. > > > > I cannot understand the statement "That leaves isolated which is kind of > > hard to talk about with ZK since all operations are fast and sequential." > > well. Could you explain a bit? What is "that" means and where is the > "hard" > > comes from? > > > > Best, > > tison. > > > > > > Ted Dunning <ted.dunn...@gmail.com> 于2019年8月15日周四 上午9:40写道： > > > > > The multi op is atomic (all other operations will be before or after > teh > > > multi), consistent (all viewers will see all the effects or none, and > > > durable (because ZK is linearized anyway). > > > > > > That leaves isolated which is kind of hard to talk about with ZK since > > all > > > operations are fast and sequential. > > > > > > On Wed, Aug 14, 2019 at 3:12 PM Michael Han <h...@apache.org> wrote: > > > > > > > ... > > > > Ted can correct me if I am wrong, since he added the multi op > feature, > > > but > > > > my understanding is "multi op" is branded from day one as the > > transaction > > > > support for zookeeper (we even provide an API with exact name: > > > > Transaction). If we use the traditional semantic for transaction in > > > > database context, the ACID properties multi-op satisfies at least > > > atomicity > > > > and durability. So saying zookeeper does not support transaction > seems > > a > > > > strong argument that against the properties of multi-op and existing > > > > literatures related to zookeeper. On the other side, typically bulk > > > > operations does not support atomicity, which will not take care of > > > rolling > > > > back failed operations. > > > > > > > > > > > > > > > > > > > >
