Thanks a lot for your answers. Best regards, VN
On Wed, Apr 29, 2020 at 5:07 AM Szalay-Bekő Máté <szalay.beko.m...@gmail.com> wrote: > also, if you want, you can enable read-only mode in the ZooKeeper > server. Read-only mode allows client sessions to connect to the server > even when the server might be partitioned from the quorum. In this mode the > clients can still read values from the ZK service, but will be unable to > write values and see changes from other clients. Also beside enabling this > on server-side, you have to allow this on the client side as well when you > initiate the connection. By default the Read-only mode is disabled and > ZooKeeper behaves as Chris described. > > Kind regards, > Mate > > On Tue, Apr 28, 2020 at 6:27 PM Chris T. <c.turks...@gmail.com> wrote: > > > 1: It will close the client port and will remain unavailable for clients > > until it can form or join a quorum (majority). > > 2: No, see above. > > 3+4: They will keep trying to connect to the Zookeeper servers in the > > connection string until they find one that works. The exact messages you > > get depend on the client application or framework you are using. For > > example Apache Curator framework or the internal client implementations > of > > SOLR or KAFKA all have different behaviour and messages messages. > Something > > like Connection State Lost, Client Connection timed out, Attempting > > reconnect etc... > > > > Regards, > > > > Chris > > > > > > On Tue, Apr 28, 2020 at 5:47 PM Vincent Ngan <ngan.vinc...@gmail.com> > > wrote: > > > > > Hi, > > > > > > I would like to know what will happen to ZooKeeper servers and the > > clients > > > connected to them when a network segmentation occurs. > > > > > > Supposing a network segmentation happens. One of the ZK servers > > > looses contact with all the other ZK servers. This ZK server is still > but > > > it should know that it is not among the majority of a quorum. Then, > > > > > > 1. What will happen to this isolated ZK server? > > > 2. Will it still function and serve client requests? > > > 3. If there are clients also located in the same isolated segment > and > > > are currently connected to this ZK server, what will happen to these > > > clients? > > > 4. What errors code and messages will these clients detect? > > > > > > Best regards, > > > VN > > > > > >
