Oh，good. It is a perfect feature. Not only in the case of upgrade, many time, when want to change our zk server....
在 2011年11月30日 上午11:44，Camille Fournier <[email protected]>写道： > We've been looking at that, see: > https://issues.apache.org/jira/browse/ZOOKEEPER-107 > > It'll take some evaluation though. Hopefully 3.5? > > C > > On Tue, Nov 29, 2011 at 10:21 PM, nileader <[email protected]> wrote: > > 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 > >>> > > >>> > >> > >> >
