FAQ

Riak MDC Replication FAQ

• Can fullsync replication run between clusters having rings of different sizes?
  • No
• Can realtime replication run between clusters having different n values?
  • Yes, but very inefficiently
• How can it be determined if backpressure is being applied during replication?
  • look at netstat -a output and see if Recv-Q and Send-Q and growing
• How can network performance between source + sink be measured
  • iperf
• Do replicated puts show up in riak-admin status stats?
  • yes, here are the rt puts for a single object on a sink with an n_val=3:

vnode_puts : 3
vnode_puts_total : 3

- see also:
 https://github.com/basho/riak_repl/blob/develop/src/riak_repl_util.erl#L109 

• Do bucket hooks on the sink fire?

  • No, puts on the sink use disable_hooks: https://github.com/basho/riak_repl/blob/develop/src/riak_repl_util.erl#L117

• What happens when the same keys are written into both source and sink?

  • be extra darn careful about resolving siblings on either side!
  • kittens die