frequently receive a StateDisconnected

[Terry-Mao]

log:

comet103.yw-0-0.root.log.INFO.20140528-035809.33139:I0528 06:03:21.827998 33139 zk.go:50] zookeeper get a event: StateSyncConnected
comet103.yw-0-0.root.log.INFO.20140528-035809.33139:I0528 06:03:22.047343 33139 zk.go:50] zookeeper get a event: StateDisconnected
comet103.yw-0-0.root.log.INFO.20140528-035809.33139:I0528 06:03:22.295198 33139 zk.go:50] zookeeper get a event: StateConnecting
comet103.yw-0-0.root.log.INFO.20140528-035809.33139:I0528 06:03:22.295206 33139 zk.go:50] zookeeper get a event: StateConnected
comet103.yw-0-0.root.log.INFO.20140528-035809.33139:I0528 06:03:22.369996 33139 zk.go:50] zookeeper get a event: StateExpired
comet103.yw-0-0.root.log.INFO.20140528-035809.33139:I0528 06:03:22.370007 33139 zk.go:50] zookeeper get a event: StateDisconnected
comet103.yw-0-0.root.log.INFO.20140528-035809.33139:I0528 06:03:22.386103 33139 zk.go:50] zookeeper get a event: StateConnecting
comet103.yw-0-0.root.log.INFO.20140528-035809.33139:I0528 06:03:22.386112 33139 zk.go:50] zookeeper get a event: StateConnected
comet103.yw-0-0.root.log.INFO.20140528-035809.33139:I0528 06:03:22.742684 33139 zk.go:50] zookeeper get a event: StateHasSession
comet103.yw-0-0.root.log.INFO.20140528-035809.33139:I0528 06:03:22.818002 33139 zk.go:50] zookeeper get a event: StateDisconnected

seems go-zookeeper retry connecting, but session expired, then receive a StateHasSession, what does this mean?

[jimrobinson]

It looks to me as though this is set once the connection
has been established and it has finished its authentication
phase.

https://github.com/samuel/go-zookeeper/blob/master/zk/conn.go#L397

As to frequent connection/disconnection I wonder if that's
a problem outside of the zk library. Do you see the same
problem if you connect to it using some other client, such
as the zkCli client that comes with zookeeper?

I haven't seen that kind of flapping with my own tests
of go-zookeeper.

[Terry-Mao]

the zookeeper host machine swap, so get a StateDisconnected, go-zookeeper library is ok.
when StateDisconnected then receive session expired we can retry connect to zk.