Hi,
I'd like to resurrect this thread from April 2012 -
http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/migrating-from-SimpleStrategy-to-NetworkTopologyStrategy-td7481090.html
- "migrating from SimpleStrategy to NetworkTopologyStrategy"
We're in a similar situation, and I'd like to understand this more
thoroughly. In preparation for adding another datacenter to our
cassandra cluster, I'd like to migrate from EC2Snitch + SimpleStrategy
to GosspingPropertyFileSnitch + NetworkTopologyStrategy. Here are the
steps I'm planning:
Change the Snitch
1. set endpoint_snitch: GosspingPropertyFileSnitch in cassandra.yaml
2. configure cassandra-rackdc.properties to use a single rack and
datacenter,: rack=RAC1, dc=dc1
3. do a rolling restart of all nodes
Change replication strategy
4. for all keyspaces (except system*), alter keyspace ... with
replication = {'class' : 'NetworkTopologyStrategy', 'dc1' : 3}
5. run "nodetool repair -pr" on all nodes
Does this look right? Also, I'm curious whether/why step 5 is
necessary, given the single rack configuration.
Versions:
cassandra 1.2.2
dsc12 1.2.2-1
Ubuntu 12.04, x86_64
Datastax AMI
Thanks!
Dane
