Re: [Zookeeper-user] Reconfiguring Zookeeper in production

[Benjamin R. <br...@ya...>]

There is no such a way currently and implementing it would probably be harder 
than implementing the addition and removal of servers in a ZooKeeper cluster. 
It does seem like a useful feature to gracefully decommission a running 
ZooKeeper leader.

ben

On Tuesday 22 July 2008 17:16:05 Patrick Hunt wrote:
> Is there a way to ask the zk cluster to switch leaders? Switch in such a
> way as it doesn't cause a "virtual bounce"? (I mean can we code
> something that would enable this)
>
> Patrick
>
> Benjamin Reed wrote:
> > Creative idea. This should work. It's kind of a pain. I don't think
> > there is a Jira opened for this, but you should open one. It's really a
> > matter of implementation. You should be able to add (or remove) a
> > machine to ZooKeeper and just have it get integrated in without having
> > to do any restarting. The real problem with the restarting is that
> > eventually you will get to the leader which will cause a virtual bounce
> > of everyone when a new leader gets elected, so you really don't save
> > much by doing it gradually.
> >
> > ben
> >
> > Austin Shoemaker wrote:
> >> We are using Zookeeper to implement consistent hashing, and need to be
> >> able to add or remove hosts from the Zookeeper service without
> >> interrupting its functionality.
> >>
> >> According to
> >> http://zookeeper.wiki.sourceforge.net/ZooKeeperConfiguration: "Every
> >> machine that is part of the ZooKeeper service needs to know about every
> >> other machine. So, we need to have a list of machines in the
> >> configuration file."
> >>
> >> Can we add a single Zookeeper server to the service with an expanded
> >> host list without interrupting the proper functioning of the service?
> >> The old servers will each have host list s_1, ..., s_k, and the new
> >> server s_k+1 will have host list s_1, ..., s_k, s_k+1. Now we need to
> >> restart the rest of the servers one by one from s_1 to s_k with the
> >> new host list s_1, ..., s_k, s_k+1. Is this a violation of the service
> >> specification?
> >>
> >> Thanks,
> >>
> >> Austin
> >>
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