FYI: We(Alibaba) are widely using ZooKeeper 3.5.5 for all the YARN and some K8s Flink high-available applications.
Best, Yang Chesnay Schepler <ches...@apache.org> 于2021年12月7日周二 上午2:22写道： > Current users of ZK 3.4 and below would need to upgrade their Zookeeper > installation that is used by Flink to 3.5+. > > Whether K8s users are affected depends on whether they use ZK or not. If > they do, see above, otherwise they are not affected at all. > > On 06/12/2021 18:49, Arvid Heise wrote: > > Could someone please help me understand the implications of the upgrade? > > > > As far as I understood this upgrade would only affect users that have > > a zookeeper shared across multiple services, some of which require ZK > > 3.4-? A workaround for those users would be to run two ZKs with > > different versions, eventually deprecating old ZK, correct? > > > > If that is the only limitation, I'm +1 for the proposal since ZK 3.4 > > is already EOL. > > > > How are K8s users affected? > > > > Best, > > > > Arvid > > > > On Mon, Dec 6, 2021 at 2:00 PM Chesnay Schepler <ches...@apache.org> > > wrote: > > > > ping @users; any input on how this would affect you is highly > > appreciated. > > > > On 25/11/2021 22:39, Chesnay Schepler wrote: > > > I included the user ML in the thread. > > > > > > @users Are you still using Zookeeper 3.4? If so, were you > > planning to > > > upgrade Zookeeper in the near future? > > > > > > I'm not sure about ZK compatibility, but we'd also upgrade > > Curator to > > > 5.x, which doesn't support ookeeperK 3.4 anymore. > > > > > > On 25/11/2021 21:56, Till Rohrmann wrote: > > >> Should we ask on the user mailing list whether anybody is still > > using > > >> ZooKeeper 3.4 and thus needs support for this version or can a > > ZooKeeper > > >> 3.5/3.6 client talk to a ZooKeeper 3.4 cluster? I would expect > > that > > >> not a > > >> lot of users depend on it but just to make sure that we aren't > > >> annoying a > > >> lot of our users with this change. Apart from that +1 for > > removing it if > > >> not a lot of user depend on it. > > >> > > >> Cheers, > > >> Till > > >> > > >> On Wed, Nov 24, 2021 at 11:03 AM Matthias Pohl > > <matth...@ververica.com> > > >> wrote: > > >> > > >>> Thanks for starting this discussion, Chesnay. +1 from my side. > > It's > > >>> time to > > >>> move forward with the ZK support considering the EOL of 3.4 > > you already > > >>> mentioned. The benefits we gain from upgrading Curator to 5.x as > a > > >>> consequence is another plus point. Just for reference on the > > >>> inconsistent > > >>> state issue you mentioned: FLINK-24543 [1]. > > >>> > > >>> Matthias > > >>> > > >>> [1] https://issues.apache.org/jira/browse/FLINK-24543 > > >>> > > >>> On Wed, Nov 24, 2021 at 10:19 AM Chesnay Schepler > > <ches...@apache.org> > > >>> wrote: > > >>> > > >>>> Hello, > > >>>> > > >>>> I'd like to drop support for Zookeeper 3.4 in 1.15, upgrading > the > > >>>> default to 3.5 with an opt-in for 3.6. > > >>>> > > >>>> Supporting Zookeeper 3.4 (which is already EOL) prevents us from > > >>>> upgrading Curator to 5.x, which would allow us to properly > > fix an > > >>>> issue > > >>>> with inconsistent state. It is also required to eventually > > support ZK > > >>> 3.6. > > > > > > > > >
