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https://issues.apache.org/jira/browse/DISPATCH-1579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17055256#comment-17055256
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ASF GitHub Bot commented on DISPATCH-1579:
------------------------------------------

kgiusti commented on pull request #693: DISPATCH-1579: open dedicated 
inter-router sessions for data and control links
URL: https://github.com/apache/qpid-dispatch/pull/693#discussion_r389859457
 
 

 ##########
 File path: src/router_node.c
 ##########
 @@ -786,18 +786,47 @@ static int AMQP_link_attach_handler(void* context, 
qd_link_t *link)
 
 
 /**
- * Handler for flow events on links
+ * Handler for flow events on links.  Flow updates include session window
+ * state, which needs to be checked for unblocking Q3.
  */
 static int AMQP_link_flow_handler(void* context, qd_link_t *link)
 {
-    qd_router_t *router = (qd_router_t*) context;
-    qdr_link_t  *rlink  = (qdr_link_t*) qd_link_get_context(link);
-    pn_link_t   *pnlink = qd_link_pn(link);
-
-    if (!rlink)
-        return 0;
+    qd_router_t *router  = (qd_router_t*) context;
+    pn_link_t   *pnlink  = qd_link_pn(link);
+    pn_session_t *pn_ssn = pn_link_session(pnlink);
+
+    bool link_flowed = false;
+    if (pn_ssn) {
+        qd_session_t *qd_ssn = pn_session_get_context(pn_ssn);
+        if (qd_ssn && qd_session_is_q3_blocked(qd_ssn)) {
+            // Q3 blocked - have we drained enough outgoing bytes?
+            const size_t q3_lower = BUFFER_SIZE * QD_QLIMIT_Q3_LOWER;
 
 Review comment:
   This is tricky - BUFFER_SIZE is actually a variable not a constant.  The 
unit tests modify it to test various buffer sizes.  I can compute it at startup 
after the buffer code is done initializing.
 
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> Traffic hangs when multiple large messages are sent using different priorities
> ------------------------------------------------------------------------------
>
>                 Key: DISPATCH-1579
>                 URL: https://issues.apache.org/jira/browse/DISPATCH-1579
>             Project: Qpid Dispatch
>          Issue Type: Bug
>          Components: Router Node
>    Affects Versions: 1.10.0
>            Reporter: Ken Giusti
>            Assignee: Ken Giusti
>            Priority: Blocker
>             Fix For: 1.11.0
>
>
> Create a two hop router network.  Attach a single receiver on one router.  
> Create 10 senders on the other router.  Each sender should sent a large 
> number of (unsettled) messages at a given priority (IOW 10 senders, one 
> sender sends priority 0 messages, another sends priority 1 messages, etc).
> If the messages are large enough to trigger Q3 eventually most (all?) of the 
> senders will hang stuck waiting for either settlement or deliveries to be 
> forwarded.   There is no recovery.
> I will post a reproducer soon.



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