> Does anyone know enough of the inner working of Cassandra to tell me how much > work is needed to patch Cassandra to enable such communication > vectorization/batch ? > Assuming you mean "have the coordinator send multiple row read/write requests in a single message to replicas"
Pretty sure this has been raised as a ticket before but I cannot find one now. It would be a significant change and I'm not sure how big the benefit is. To send the messages the coordinator places them in a queue, there is little delay sending. Then it waits on them async. So there may be some saving on networking but from the coordinators point of view I think the impact is minimal. What is your use case? Cheers ----------------- Aaron Morton Freelance Cassandra Consultant New Zealand @aaronmorton http://www.thelastpickle.com On 27/04/2013, at 4:04 AM, DE VITO Dominique <dominique.dev...@thalesgroup.com> wrote: > Hi, > > We are created a new partitioner that groups some rows with **different** row > keys on the same replicas. > > But neither the batch_mutate, or the multiget_slice are able to take > opportunity of this partitioner-defined placement to vectorize/batch > communications between the coordinator and the replicas. > > Does anyone know enough of the inner working of Cassandra to tell me how much > work is needed to patch Cassandra to enable such communication > vectorization/batch ? > > Thanks. > > Regards, > Dominique > >
