Hi, it is quite some time that we are seeing Bookies in staging environments which disappear from ZK but appartently are still up and running.
I have not dug deeply into this problem, but at first glance it should be related to ZK session expiration, those machines are heavily loaded sometimes and it is not surprising that ZK session expires. Apart from searching for a bug, I wonder if would it be useful an automatic self check of the bookie, something like a periodic check which asks to the Registration Manager if the bookie is listed in the expected bookie list (readonly/available....) This will be useful even if we are not using ZK as well, now that we have this great abstraction of ZK Thoughts ? Enrico
