On 02/18/2013 03:16 PM, Alan Conway wrote:
Hi Gordon,
I'm thinking about new-HA over 1.0. How much work do you think it would
be to create replicating links with the new domain model?
Conceptually there are no big problems, but it would require a fair bit
of new code I think, though I have not thought it through in any detail yet.
The existing solution is quite tied to 0-10 code. E.g.
ReplicatingSubscription extends SemanticState::ConsumerImpl which is
part of the 0-10 codepath.
HA currently uses the Link/Bridge classes to host its replicating
subscriptions, so probably we'll need an abstraction that can be
implemented over both Link/Bridge and 1.0 domains.
Yes. QueueReplicator in particular would need to be looked at with a
view to how it could initiate replication over 1.0.
The ties to Links from BrokerReplicator, HaBroker, Primary and Backup
are I think(?) more around the use of QMF to drive automatic replication
configuration. QMF is itself 0-10 only at present. However that isn't as
big an issue.
Note that you can of course use the 0-10 HA between brokers while having
applications connect to the brokers using 1.0. The one issue there is
the potential for the conversion between 1.0 to 0-10 message formats to
alter the exact byte sequence of the 'bare message' in 1.0 terms.
Do we have failover in 1.0 yet (broker and/or client)?
No, not yet.
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