Does any additional setup info need to be exposed via qpid-route, or is
this hidden from the user?
Carl.
Gordon Sim wrote:
At present, if connections between brokers fail they will periodically
attempt to reconnect on the defined host and port. A broker now also
sends a list of known-hosts during the connection handshaking.
As part of some work on asynchronous state replication between
clusters I have committed a patch (r736354) that uses the addresses
supplied as known-hosts when attempting to re-establish a link. I
encountered a few issues that I thought were worth mentioning:
(i) The host and port combination is used as a key in the link
registry. If either of these are changed the link registry has to be
updated so that the link can be notified of establishment of a
connection (which is signaled to the registry using the host:port key).
(ii) The host and port are immutable on the management object for a
link and are used in the indexing of the object. I didn't change this
which means that the host and port properties don't necessarily
correspond to those used in the current connection. To make up for
that I set the error state to indicate that the link has failed over
to a specified address.
(iii) This behaviour will currently be triggered whenever the broker
supplies tcp addresses in the known-hosts list. At present it does so
regardless of whether its part of a cluster. The cluster module allows
the URL used to be overridden and I've added a similar option to the
broker options (it also allows an empty list to be sent be specifying
'none').
(iv) One important limitation at present is that any changes to the
cluster membership after a federation link has been established to
that cluster will not yet be picked up. Thus when adding a member, on
a new host and port combination, to a cluster the federation links
would need to be recreated.
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Project: http://qpid.apache.org
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