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https://issues.apache.org/jira/browse/AMQCPP-525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13830962#comment-13830962
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Matthew Western commented on AMQCPP-525:
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Excellent, thank you !
> C++ client hangs when using the failover transport to connect to a network of
> brokers
> -------------------------------------------------------------------------------------
>
> Key: AMQCPP-525
> URL: https://issues.apache.org/jira/browse/AMQCPP-525
> Project: ActiveMQ C++ Client
> Issue Type: Bug
> Components: Openwire
> Affects Versions: 3.8.1
> Environment: Centos 5.9, ActiveMQ 5.9.0, ActiveMQ CPP Library 3.8.1
> C++ Test Listener
> Reporter: Matthew Western
> Assignee: Timothy Bish
> Fix For: 3.8.2, 3.9.0
>
>
> I have a network of three brokers on three different hosts each with nio
> transport connectors as follows (host 1 below, hosts 2 and 3 follow the same
> pattern):
> <transportConnector name="openwire-client"
> uri="nio://host1.somedomain.com:44320"
> updateClusterClients="true"
> rebalanceClusterClients="true"
> updateClusterClientsOnRemove="true"
> />
> I modified the ActiveMQ C++ example Listener (Listener.cpp) with the
> following broker URL:
> failover:(tcp://host1.somedomain.com:44320)
> The Listener hangs in connection->start() and never establishes a connection
> with any of the three brokers.
> I put debug into FailoverTransport.cpp and discovered that the URIs received
> from the three brokers are being used verbatim by the C++ client - i.e. it
> tries to rebalance/reconnect using the nio scheme in the URIs received from
> the broker transport connector configuration.
> The C++ client has no handling for the nio scheme and so continually iterates
> though the URI pool but never establishes a connection to any of the URIs,
> hence the hang.
> According to the ActiveMQ website "Configuring Transports" documentation if
> the nio transport is specified in a URI used by an OpenWire client, it should
> simply instantiate the normal tcp transport, but this handling seems to be
> missing from the C++ client.
> I put a quick fix into the FailoverTransport::updateURIs() method to convert
> any URI received from a broker with a scheme of "nio" to the same URI but
> with a scheme of "tcp" and then the client successfully connected to one of
> the brokers:
> Pointer<Iterator<URI> > setIter(set.iterator());
> while (setIter->hasNext()) {
> URI value = setIter->next();
> if (value.getScheme() == "nio") {
> std::cout << "Found NIO scheme, changing to TCP" <<
> std::endl;
> URI newValue = URI("tcp", value.getAuthority(),
> value.getPath(), value.getQuery(),
> value.getFragment());
> value = newValue;
> }
> this->impl->updated->addURI(value);
> }
> This is obviously not an appropriate solution for the production code, but it
> does serve to demonstrate the issue.
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