Seems that al the sites which are reporting this kind of problems are ONLY on 4.6.2.
After an upgrade to 4.7.0 apparently the problem disappears. I will send news next week Enrico Il dom 20 mag 2018, 19:18 Enrico Olivelli <eolive...@gmail.com> ha scritto: > My guess is that is about using zk ACLs > I have no evidence > > Enrico > > > Il mar 15 mag 2018, 14:09 Enrico Olivelli <eolive...@gmail.com> ha > scritto: > >> 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 >>> > >>> >> -- > > > -- Enrico Olivelli > -- -- Enrico Olivelli
