Re: [infinispan-dev] hotrod client - initial connection
On Wed, 10 Mar 2010 14:08:23 +0100, Mircea Markus
<mircea.markus(a)jboss.com> wrote:
Hi Galder,
Here are some thoughts I have about how the hotrod client performs
initial connection to the HR servers:
A list of servers is statically configured so that the client can
connect to any of them
1. client will ping each configured server until it finds
one that is up and running
2. at this point it will stop(i.e. not query other
statically configured servers) and query this server for the cluster
topology
The idea was that rather than querying for the cluster topology, the
client would register for notification it's interested in. From the wiki:
"Before any the server can send any notifications, clients need to
register and indicate which events they're interested in. To do that, they
have to send a request like this:
[request header][events]"
So, if a client was interested in topology change notifications, it would
tell the server accordingly.
3. a a response to this query, the server informs the
client about hotrod cluster topology (which might be different than
infinispan cluster, right?)
Although not specified in the wiki, I would assume that once you register
with the server, the server would push the current topology, no need for
further requests from client.
4. based on this information client builds a pool of
connections to the servers
5. client register itself as cluster formation listener,
and update the list of active servers whenever the topology changes
(cluster formation might not be the best name for this listener as it
only refers to the time when cluster is formed, what about cluster
topology listener?)
You'd still need a listener like the one you mention based on the
information received from the server(s).
How does this sound to you?
</snip>
Cheers,
Mircea
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Galder Zamarreño
Sr. Software Engineer
Infinispan, JBoss Cache