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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