change: increase default cassandra RF to 3 and update docs

Signed-off-by: Jacob Lisi <[email protected]>

Author: jtlisi

docs/configuration/config-file-reference.md

@@ -1861,7 +1861,7 @@ cassandra:
 
   # Replication factor to use in Cassandra.
   # CLI flag: -cassandra.replication-factor
-  [replication_factor: <int> | default = 1]
+  [replication_factor: <int> | default = 3]
 
   # Instruct the cassandra driver to not attempt to get host info from the
   # system.peers table.

pkg/chunk/cassandra/storage_client.go

@@ -57,7 +57,7 @@ func (cfg *Config) RegisterFlags(f *flag.FlagSet) {
 	f.IntVar(&cfg.Port, "cassandra.port", 9042, "Port that Cassandra is running on")
 	f.StringVar(&cfg.Keyspace, "cassandra.keyspace", "", "Keyspace to use in Cassandra.")
 	f.StringVar(&cfg.Consistency, "cassandra.consistency", "QUORUM", "Consistency level for Cassandra.")
-	f.IntVar(&cfg.ReplicationFactor, "cassandra.replication-factor", 1, "Replication factor to use in Cassandra.")
+	f.IntVar(&cfg.ReplicationFactor, "cassandra.replication-factor", 3, "Replication factor to use in Cassandra.")
 	f.BoolVar(&cfg.DisableInitialHostLookup, "cassandra.disable-initial-host-lookup", false, "Instruct the cassandra driver to not attempt to get host info from the system.peers table.")
 	f.BoolVar(&cfg.SSL, "cassandra.ssl", false, "Use SSL when connecting to cassandra instances.")
 	f.BoolVar(&cfg.HostVerification, "cassandra.host-verification", true, "Require SSL certificate validation.")