Sylvain Lebresne created CASSANDRA-5899:
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Summary: Sends all interface in native protocol notification when
rpc_address=0.0.0.0
Key: CASSANDRA-5899
URL: https://issues.apache.org/jira/browse/CASSANDRA-5899
Project: Cassandra
Issue Type: Bug
Reporter: Sylvain Lebresne
Priority: Minor
Fix For: 2.0
For the native protocol notifications, when we send a new node notification, we
send the rpc_address of that new node. For this to be actually useful, that
address sent should be publicly accessible by the driver it is destined to.
The problem is when rpc_address=0.0.0.0. Currently, we send the listen_address,
which is correct in the sense that we do are bind on it but might not be
accessible by client nodes.
In fact, one of the "good" reason to use 0.0.0.0 rpc_address would be if you
have a private network for internode communication and another for
client-server communinations, but still want to be able to issue query from the
private network for debugging. In that case, the current behavior to send
listen_address doesn't really help.
So one suggestion would be to instead send all the addresses on which the
(native protocol) server is bound to (which would still leave to the driver the
task to pick the right one, but at least it has something to pick from).
That's relatively trivial to do in practice, but it does require a minor binary
protocol break to return a list instead of just one IP, which is why I'm
tentatively marking this 2.0. Maybe we can shove that tiny change in the final
(in the protocol v2 only)? Povided we agree it's a good idea of course.
Now to be complete, for the same reasons, we would also need to store all the
addresses we are bound to in the peers table. That's also fairly simple and the
backward compatibility story is maybe a tad simpler: we could add a new
{{rpc_addresses}} column that would be a list and deprecate {{rpc_address}} (to
be removed in 2.1 for instance).
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