Thanks Mate for the responses. Brings a lot of clarity to me. I was able to get it working this time without downtime. Don't know what I did wrong the last time though.
On Mon, 20 Jul 2020 at 12:57, Szalay-Bekő Máté <szalay.beko.m...@gmail.com> wrote: > echo "stat" | nc localhost 2182Hi, > > I guess this is the part you are referring: > > https://zookeeper.apache.org/doc/r3.5.8/zookeeperAdmin.html#Upgrading+existing+nonTLS+cluster > (your link was pointing to the 3.3.2 admin guide where this chapter was > missing) > > > 1) When I set sslQuorum=true and portUnification=true on the first > server, > does it go out of the quorum? And when these properties are set in the > second server, a new quorum of first and second server is formed and now > the third server is out of quorum. When the 3rd server follows suit, it is > added back to the quorum. > > the "sslQuorum=true and portUnification=true" setting is needed in step 4 > (although the numbering is bad in the markdown...). After step 3 you > already have a 3 server quorum up with portUnification=true, meaning the > cluster can handle both TLS/SSL and regular/non-secure connections. So when > you restart server 1 with sslQuorum=true, then it will be able to re-join > to the quorum, as server 2 and 3 are capable of handling SSL connections > (even if they are not using it for connection initiation). So ideally > between restarting each servers with sslQuorum=true, you always should have > a 3 node full quorum. > > > 2) The guideline says to check after restarting every broker that the > quorum is healthy, is there any metric to track that? > > I send the "stat" command to all nodes to see if everyone is connected to > the quorum. E.g.: echo "stat" | nc localhost 2181 > I usually use 4-letter-word commands but the REST admin API works as well, > and actually that is the officially recommended way, as the 4-letter-words > are / will be deprecated some time. > For the admin server see: > https://zookeeper.apache.org/doc/r3.5.8/zookeeperAdmin.html#sc_adminserver > > Kind regards, > Mate > > On Tue, Jul 14, 2020 at 10:52 PM Sankalp Bhatia <sankalpbhati...@gmail.com > > > wrote: > > > +users > > > > On Tue, 14 Jul 2020 at 21:51, Sankalp Bhatia <sankalpbhati...@gmail.com> > > wrote: > > > > > Hi All, > > > > > > I am trying to follow the section "Upgrading existing non-TLS cluster > > with > > > no downtime" in the zookeeper guide : > > > https://zookeeper.apache.org/doc/r3.3.2/zookeeperAdmin.html > > > > > > I have an ensemble of 3 servers. I have a couple of questions: > > > > > > 1) When I set sslQuorum=true and portUnification=true on the first > > > server, does it go out of the quorum? And when these properties are set > > > in the second server, a new quorum of first and second server is formed > > and > > > now the third server is out of quorum. When the 3rd server follows > suit, > > it > > > is added back to the quorum. > > > > > > If this is the case, what is the use of a the port-unification feature > > > here? > > > > > > 2) The guideline says to check after restarting every broker that the > > > quorum is healthy, is there any metric to track that? > > > > > > Thanks, > > > Sankalp > > > > > > > > > > > > > > >
