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
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 >
> wrote:
>
> > +users
> >
> > On Tue, 14 Jul 2020 at 21:51, Sankalp Bhatia
> > 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
> > >
> > >
> > >
> > >
> >
>
