Suppose two servers, SA in cluster A and SB in cluster B. If SA
sends a message to SB on an account for which there is no interest
at all (account not known or no subscription), SB will send an A-
and keep track that it sent an A- for this account.
When a queue subscription is created on SB, SB will send and RS+
to A because A needs to have perfect knowledge of all queue subs
in all clusters.
If then a regular subscription is also created on SB, SB will
think that it needs to send an A+ because it had sent an A- for
this account. However, SA had an entry for this account for the
queue sub. The A+ would clear the entry in the map and would cause
SA to not send messages to SB even if they would have been a
match for the queue sub on SB.
We fix this in two ways:
- Clear the possible A- in SB when sending an RS+ for queue sub
- Processing of A-/A+ to be aware of a possible entry in the map
due to queue subs.
Signed-off-by: Ivan Kozlovic <ivan@synadia.com>
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