Unable to disable push/pull sync

[tonglil]

Configuration:

    // Configure memberlist
    conf := memberlist.DefaultWANConfig()
    conf.AdvertisePort = port
    conf.AdvertiseAddr = ip
    conf.BindPort = port
    conf.BindAddr = ip
    conf.Name = name
    conf.Events = delegate
    conf.GossipNodes = 6
    conf.GossipInterval = conf.GossipInterval * 5 // 2.5s
    conf.PushPullInterval = 0 // this should disable PushPull based on https://github.com/hashicorp/memberlist/blob/master/config.go#L66
    conf.DisableTcpPings = true

INFO[0015] memberlist - [DEBUG] memberlist: Initiating push/pull sync with: 127.0.0.1:23333 
INFO[0015] memberlist - [DEBUG] memberlist: TCP connection from=127.0.0.1:59993 

I am trying to minimize or eliminate TCP connections between nodes.

However when I start the server, it still creates TCP connections.

Does memberlist always sync state when it is joining a cluster?

[jpfuentes2]

I've been perusing this code and working on a memberlist-compliant service in another language for kicks. The README.md and config.go seem to suggest that with the right configuration TCP will not be used at all.

Unfortunately, as @tonglil described above: TCP is used when one issues a memberlist.Join as it calls pushPullNode which in turn calls sendAndReceiveState here.

Should sendAndReceiveState support UDP at the expense of bandwidth?

[slackpad]

Hi @tonglil and @jpfuentes2 this has been in there for quite a long time - a43fd04#diff-c5a0fd3b9b3c075b837e5f6dc71db15d. We will have to think through the implications of omitting this step - I'm not 100% sure if things would converge correctly without this on the initial join without going through the details.