Basically MV updates are processed when a mutation is applied. For MV replicas that stay local, MV mutations are also applied directly (see StorageProxy.mutateMV). For remote MV mutations, a batch is created. Maybe I am wrong but code is somehow contradictory:
TableView.pushViewReplicaUpdates: // now actually perform the writes and wait for them to complete > asyncWriteBatchedMutations(wrappers, localDataCenter, Stage.VIEW_MUTATION); Comment says, caller waits for updates, but code executes async. So you are right in the case MV has a different PK than base table and replica goes to a remote host. If base PK == mv PK then updates are always local and sync. Did I still miss sth? 2017-02-10 14:11 GMT+01:00 Brian Hess <brianmh...@gmail.com>: > This is not true. > > You cannot provide a ConsistencyLevel for the Materialized Views on a > table when you do a write. That is, you do not explicitly write to a > Materialized View, but implicitly write to it via the base table. There is > not consistency guarantee other than eventual between the base table and > the Materialized View. That is, the coordinator only acknowledges the write > when the proper number of replicas in the base table have acknowledged > successful writing. There is no waiting or acknowledgement for any > Materialized Views on that table. > > Therefore, while you can specify a Consistency Level on read since you are > reading directly from the Materialized View as a table, you cannot specify > a Consistency Level on wrote for the Materialized View. So, you cannot > apply the R+W>RF formula. > > ---->Brian > > > On Feb 10, 2017, at 3:17 AM, Kant Kodali <k...@peernova.com> wrote: > > > > thanks! > > > > On Thu, Feb 9, 2017 at 8:51 PM, Benjamin Roth <benjamin.r...@jaumo.com> > > wrote: > > > >> Yes it is > >> > >> Am 10.02.2017 00:46 schrieb "Kant Kodali" <k...@peernova.com>: > >> > >>> If reading from materialized view with a consistency level of quorum > am I > >>> guaranteed to have the most recent view? other words is w + r > n > >> contract > >>> maintained for MV's as well for both reads and writes? > >>> > >>> Thanks! > >>> > >> > -- Benjamin Roth Prokurist Jaumo GmbH · www.jaumo.com Wehrstraße 46 · 73035 Göppingen · Germany Phone +49 7161 304880-6 · Fax +49 7161 304880-1 AG Ulm · HRB 731058 · Managing Director: Jens Kammerer
