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https://issues.apache.org/jira/browse/DISPATCH-195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16112148#comment-16112148
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Dan Langford commented on DISPATCH-195:
---------------------------------------

i wanted to leave a comment here because this page appears in google search 
results regarding $coordinator and "dispatch router". (none of the qpid 
dispatch docs mention $coordinator)

i was able to linkRoute $coordinator and my client was happy creating a 
transacted session. except when the listener had multiTenant set to true. In 
this case i found if i wanted to support transactions i could linkRoute 
vhost/$coordinator and my client was satisfied

as a reminder for anybody stumbling here from a google search: 
if you have multiTenant: true in your listener dispatch router will simulate 
multitenancy and take the client provided HOSTNAME and DESTINATION and route 
traffic to an address called HOSTNAME/DESTINATION

vhost:foo queue:bar becomes address:foo/bar

so to support multiTenant transactions (i think, at least the client is 
satisfied) in a scenario where we are using multiTenant and the vhost is foo i 
needed to make a linkRoute handling prefix: foo/$coordinator

> Add support for transactional messages in the Router
> ----------------------------------------------------
>
>                 Key: DISPATCH-195
>                 URL: https://issues.apache.org/jira/browse/DISPATCH-195
>             Project: Qpid Dispatch
>          Issue Type: New Feature
>          Components: Routing Engine
>    Affects Versions: 0.5
>         Environment: Linux
>            Reporter: linuxta
>            Assignee: Gordon Sim
>             Fix For: 0.8.0
>
>
> The proton example fails with a router error:
> https://github.com/apache/qpid-proton/blob/master/examples/python/tx_send.py#L41
> #41  self.container.declare_transaction(self.conn, handler=self)
> When the client declares a transaction at start, proton library sends out a 
> control message that gets rejected by the router. This happens before the 
> client sends out any regular message within the transaction.
> Error Messages from router:
> ERROR (error) Invalid message: Invalid body value
> ERROR (error) Invalid message: Invalid body value
> MESSAGE (trace) Sending Message{} on link txn-ctrl  
> The message format in the body of the control message is not accepted by the 
> router.   The body has a structure:
> body=Described(symbol(u'amqp:declare:list'), [None])
> Apparently, transactionall messages are not supported by the router.



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