I personal think zookeeper team need to add the feature of changing zookeeper cluster server list in runtime---without restart server.
2011/11/30 nileader <[email protected]> > Hi，ted，you mean restart old server before new servers? > Let's see the case: > > In my cluster, there are three zk server, A,B and C each config three > server address. > Once, i want to upgrade my cluster to five server. > You say: > >> configure the new servers >> >> - update the configuration on the old servers >> >> - restart each old server one at a time >> >> - start the new servers >> >> > > So, when i config Server C's serverlist, it will be five server in it's > zoo.cfg, and restart it. > Then make change on server b. Once i restart server b, there will be only > two server work in cluster, > and 2< 5/2+1. > > So, how the leader will be elect and how the cluster will work ok? > > > > > > *nileader* ni掌櫃的個人郵箱 > *MSN*： [email protected] > *Weibo*：http://weibo.com/nileader > ———————————————————————————————————————————————————————————————————————— > This email (including any attachments) is confidential and may be legally > privileged, private information of correct recipient and nileader. If you > received this email in error, please delete it immediately and do not copy > it or use it for any purpose or disclose its contents to any other person. > Thank you. > * > 本電郵(包括任何附件)可能含有機密資料並受法律保護，屬於ni掌櫃和正確收件人之間的私有信息。如您不是正確的收件人，請您立即刪除本郵件。請不要將本電郵進行複製並用作任何其它用途，或透露本郵件之內容。謝謝。 > * > > > > 2011/11/29 Ted Dunning <[email protected]> > >> To expand on that FAQ, the detailed process should be to >> >> - configure the new servers >> >> - update the configuration on the old servers >> >> - restart each old server one at a time >> >> - start the new servers >> >> - have your applications reconnect with the full set of servers in the >> connection string. This can be done whenever you like. >> >> Your clients will receive a disconnect message when the server that they >> are talking to is restarted, but they should reconnect immediately and >> transparently. You may have a problem if your applications don't handle >> transient disconnections properly. >> >> >> >> On Tue, Nov 29, 2011 at 3:10 AM, pubudu gunawardena <[email protected] >> >wrote: >> >> > On Tue, Nov 29, 2011 at 1:08 PM, nileader <[email protected]> wrote: >> > > >> > > hi, all. >> > > >> > > If i update my conf/zoo.cfg config, must i restart my zk server? >> > > >> > > In my case, we have 3 servers in production environment, now, we want >> to >> > > upgrade to 5 server. >> > >> > Take a look at http://wiki.apache.org/hadoop/ZooKeeper/FAQ#A6 where it >> > says >> > how to upgrade ZooKeeper. >> > > >> > > >> > > Any problem will happen if a kill one of three servers. >> > > >> > > >> > > *[email protected]* >> > >> > >> > >> > >> > -- >> > Thanks, >> > Pubudu >> > >> > >
