Il giorno mar 15 mag 2018 alle ore 14:04 Sijie Guo <guosi...@gmail.com> ha scritto:
> On Tue, May 15, 2018 at 4:45 AM, Enrico Olivelli <eolive...@gmail.com> > wrote: > > > 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. > > > > There should be already a logic on re-registration after session expired, > no? > Yes. The fact is that in the month we are seeing this strange behaviour. I don't know if it could be a regression on 4.7. I have no reports from production sites, but in production we have dedicated machines for bookies. > > ZooKeeper stats should always show whether a bookie is able to connect to > zookeeper. That would probably tell you what happens. > I will check, thank you for your suggestion. Enrico > > > > > > 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 > > >
