Thanks Ted, frankly speaking, your answer makes me nervous about upgrade Zookeeper server. Hope the developers of Zookeeper thinking about it. I think Zookeeper is very cool. But it isn't good enough for online systems if it cannot be upgraded without losing existed data.
Thanks On Sat, Jun 27, 2009 at 3:13 PM, Ted Dunning <ted.dunn...@gmail.com> wrote: > In general for changes like this, you need to be running more than one > server in a cluster to avoid losing state such as the ephemeral nodes. > > I can't say for certain that the 3.1.1 to 3.2 change can be done this way, > but most upgrades can be done by stopping one server at a time, changing > the software and config and restarting it. Then you move on to the next. > This will cause a connection loss event for each client eventually, but it > should > not cause any sessions to expire. > > Don't do this until somebody says something for certain that 3.1.1 can > change to 3.2 within a cluster. > > On Fri, Jun 26, 2009 at 7:16 PM, Qian Ye <yeqian....@gmail.com> wrote: > > > 2. How to upgrade from 3.1.1 to 3.2.0 properly. Just stop the old server > > and > > start the new server would be OK? Will this operation influence the old > > ephemeral znodes? Is there a perfect upgrade plan？ > > > -- With Regards! Ye, Qian Made in Zhejiang University