Andrey, QUORUM consistency and no deletes makes perfect sense. I believe we could modify that to EACH_QUORUM or QUORUM consistency and no deletes - isnt that right ?
Thanks On Tue, Aug 12, 2014 at 3:10 PM, Andrey Ilinykh <ailin...@gmail.com> wrote: > 1. You don't have to repair if you use QUORUM consistency and you don't > delete data. > 2.Performance depends on size of data each node has. It's very difficult > to predict. It may take days. > > Thank you, > Andrey > > > > On Tue, Aug 12, 2014 at 2:06 PM, Viswanathan Ramachandran < > vish.ramachand...@gmail.com> wrote: > >> Some questions on nodetool repair. >> >> 1. This tool repairs inconsistencies across replicas of the row. Since >> latest update always wins, I dont see inconsistencies other than ones >> resulting from the combination of deletes, tombstones, and crashed nodes. >> Technically, if data is never deleted from cassandra, then nodetool repair >> does not need to be run at all. Is this understanding correct? If wrong, >> can anyone provide other ways inconsistencies could occur? >> >> 2. Want to understand the performance of 'nodetool repair' in a Cassandra >> multi data center setup. As we add nodes to the cluster in various data >> centers, does the performance of nodetool repair on each node increase >> linearly, or is it quadratic ? The essence of this question is: If I have a >> keyspace with x number of replicas in each data center, do I have to deal >> with an upper limit on the number of data centers/nodes? >> >> >> Thanks >> >> Vish >> > >
