Thank you for the replies! @jeff my current cluster details are: 1 datacenter 40 nodes, with vnodes=256 RF=3 What is your advice? is it a production cluster, so I need to be very careful about it. Regards
>Thu, 14 Sep 2017 -2:47:52 -0700 from Jeff Jirsa <jji...@gmail.com>: > >The token distribution isn't going to change - the way Cassandra maps replicas >will change. > >How many data centers/regions will you have when you're done? What's your RF >now? You definitely need to run repair before you ALTER, but you've got a bit >of a race here between the repairs and the ALTER, which you MAY be able to >work around if we know more about your cluster. > >How many nodes >How many regions >How many replicas per region when you're done? > > > > >-- >Jeff Jirsa > > >On Sep 13, 2017, at 2:04 PM, Dominik Petrovic < >dominik.petro...@mail.ru.INVALID > wrote: > >>Dear community, >>I'd like to receive additional info on how to modify a keyspace replication >>strategy. >> >>My Cassandra cluster is on AWS, Cassandra 2.1.15 using vnodes, the cluster's >>snitch is configured to Ec2Snitch, but the keyspace the developers created >>has replication class SimpleStrategy = 3. >> >>During an outage last week we realized the discrepancy between the >>configuration and we would now fix the issue using NetworkTopologyStrategy. >> >>What are the suggested steps to perform? >>For Cassandra 2.1 I found only this doc: >>http://docs.datastax.com/en/cassandra/2.1/cassandra/operations/opsChangeKSStrategy.html >> >>that does not mention anything about repairing the cluster >> >>For Cassandra 3 I found this other doc: >>https://docs.datastax.com/en/cassandra/3.0/cassandra/operations/opsChangeKSStrategy.html >> >>That involves also the cluster repair operation. >> >>On a test cluster I tried the steps for Cassandra 2.1 but the token >>distribution in the ring didn't change so I'm assuming that wasn't the right >>think to do. >>I also perform a nodetool repair -pr but nothing changed as well. >>Some advice? >> >>-- >>Dominik Petrovic -- Dominik Petrovic
