[DISPATCH-2256] edge router fallback links and addresses incorrect on interior failover

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.17.0
• Fix Version/s: Backlog
• Component/s: Router Node
• Assignee: Ken Giusti
• Reporter: Ken Giusti
• Created: 14/Oct/21 17:07
• Updated: 19/Jan/22 21:47

Description

Scenario:

Configure an edge router with two separate interior connectors - one for router A and a standby for router B.

Configure a route-container listener for a broker on the edge router.  Assign two fallback destination autolinks (1 in, 1 out) to the route container for address "foo".

Start just the edge router:

• no links are active (expected).
• mgmt query for addresses show two "foo" addresses present:
  • MFfoo - the fallback address (no subscribers)
  • M0foo - the primary address (no subscribers)

Now startup the broker and after the connection to the broker:

• On the edge router:
  • links:
    • id 5, out link to broker, owning address MFfoo
    • id 6, in link from broker, owning address M0foo
  • addresses:
    • MFfoo - one local subscriber
    • M0foo - no subscribers

Now start router A.  Router A has been configured with an edge listener connection.  There is no inter-router connection configured for router B!  Once the connection is established:

• On the edge router:
  • links:
    • the two broker links (see above)
    • id 10, in link from router A, owning address MFfoo
    • id 11, out link to router A for M0foo
  • addresses:
    • MFfoo - one local subscriber
    • M0foo - no subscribers
• On Router A:
  • links:
    • id 6, out link to edge, owning address MFfoo
    • id 7, in link from edge, owning address M0foo
  • addresses:
    • MFfoo - one local subscriber
    • M0foo - no subscribers

Now start router B, wait for the edge to establish a connection to it.  Since B is a standby interior for the edge there are no 'foo' related links or addresses on B as expected.  Remember router A and B are not directly connected.

 

Fail router A.  Wait for the edge to re-establish its proxy links to router B.  The following links/addresses related to foo are now:

• On the edge router:
  • links:
    • the two broker links
    • id 20, in link from router B, owning address MFfoo
  • addresses:
    • MFfoo - one local subscriber
    • M0foo - no subscribers
• On Router B:
  • links:
    • id 6, out link to edge, owning address MFfoo
  • addresses:
    • MFfoo - one local subscriber

From the above we can see that after the failover to router B the edge router does not re-establish an outgoing link (subscription) for M0foo as it did when connected to router A.

 

Issue Links

• causes: DISPATCH-2085 system_tests_fallback_dest failure - addr_proxy.c:323: on_conn_event: Assertion `addr->edge_outlink == 0' failed