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https://issues.apache.org/jira/browse/DISPATCH-1019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16746172#comment-16746172
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Bart van Andel commented on DISPATCH-1019:
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Updated source code links in current master:
- https://github.com/apache/qpid-dispatch/blob/master/src/parse.c#L156
- https://github.com/apache/qpid-dispatch/blob/master/src/iterator.c#L362
Links to the source code lines at the time of writing:
-
https://github.com/apache/qpid-dispatch/blob/fff61db817fa310ff01061f288c5f86f8d5be262/src/parse.c#L151
-
https://github.com/apache/qpid-dispatch/blob/fff61db817fa310ff01061f288c5f86f8d5be262/src/iterator.c#L323
> Messaging instability in networks with many clients / addresses.
> ----------------------------------------------------------------
>
> Key: DISPATCH-1019
> URL: https://issues.apache.org/jira/browse/DISPATCH-1019
> Project: Qpid Dispatch
> Issue Type: Bug
> Components: Routing Engine
> Affects Versions: 1.1.0
> Reporter: Marcel Meulemans
> Priority: Major
>
> After DISPATCH-966 has been fixed I am still experiencing problems in a
> network with many clients / addresses. I am running a three node fully
> connected mesh of dispatch routers with 10000 attached clients all with two
> address messaging at around 100 msg/sec.
> In the logs I am seeing the following errors:
> {{2018-05-29 14:31:05.145732 +0000 ERROR (error) Invalid message:
> Insufficient Data to Determine Tag}}
> {{2018-05-29 14:31:05.145748 +0000 ERROR (error) Invalid message: Can't
> convert message field body}}
> Which, in turn, lead to python errors like:
> {{2018-05-29 14:31:05.145971 +0000 ROUTER_MA (trace) RCVD: MAU(id=None pv=1
> area=0 mobile_seq=0)}}
> {{2018-05-29 14:31:05.146130 +0000 ROUTER (error) Exception in control
> message processing}}
> {{ Traceback (most recent call last):}}
> {{ File "/usr/lib/python2.7/qpid_dispatch_internal/router/engine.py", line
> 157, in handleControlMessage}}
> {{ self.mobile_address_engine.handle_mau(msg, now)}}
> {{ File "/usr/lib/python2.7/qpid_dispatch_internal/router/mobile.py", line
> 97, in handle_mau}}
> {{ node = self.node_tracker.router_node(msg.id)}}
> {{ File "/usr/lib/python2.7/qpid_dispatch_internal/router/node.py", line 363,
> in router_node}}
> {{ return self.nodes[node_id]}}
> {{ KeyError: None}}
> {{2018-05-29 14:31:05.146175 +0000 ROUTER (error) Control message error:
> opcode=MAU body=None}}
> I have tracked down the cause of the "Insufficient Data to Determine Tag"
> message to the following: During the call to {{qd_parse}} of the {{MAU}}
> message the {{qd_iterator_t}} reaches the end of the buffer list before it
> should. Specifically the call to {{qd_iterator_advance}} here
> [https://github.com/apache/qpid-dispatch/blob/master/src/parse.c#L151,]
> "fails" to move forward a certain number of bytes (e.g. 31) even though the
> {{iterator->view_pointer->remaining}} value has plenty of bytes left (e.g.
> 84802). The "fail" is because we reach the end of the buffer list before we
> should (here
> [https://github.com/apache/qpid-dispatch/blob/master/src/iterator.c#L323|https://github.com/apache/qpid-dispatch/blob/master/src/iterator.c#L323).]).
> What I have not been able to figure out yet is why this happens because it is
> not consistent. Many large MAU message are parsed correctly only sometimes
> not. I am able to reproduce these errors every time I run my tests. There may
> be a time component involved because the more logging I to the router code,
> the less often the errors seem to occur.
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