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From "Gordon Sim (JIRA)" <qpid-...@incubator.apache.org>
Subject [jira] Updated: (QPID-903) Federation (inter-broker) links cause C++ broker to hang
Date Tue, 08 Apr 2008 09:55:24 GMT

     [ https://issues.apache.org/jira/browse/QPID-903?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gordon Sim updated QPID-903:
----------------------------

    Attachment: qpid-903.patch

This is due to the use of a read-write lock in the management agent. Specifically a read lock
is held for the duration of  the dispatchCommand method; if such a method attempts to add
a new managed object to the agent, it requires a write lock, but has effectively locked itself
out.

I'd suggest replacing the read-write lock with a simple mutex (which is - currently at least
- recursive). Attached is a patch that does this, and allows bridges to be created. What do
you think? I can apply that unless you have reservations.

(The alternative I think would be to use locks for specific structures that need protected,
to allow more fine grained locking).

> Federation (inter-broker) links cause C++ broker to hang
> --------------------------------------------------------
>
>                 Key: QPID-903
>                 URL: https://issues.apache.org/jira/browse/QPID-903
>             Project: Qpid
>          Issue Type: Bug
>          Components: C++ Broker
>            Reporter: Ted Ross
>         Attachments: qpid-903.patch
>
>
> When creating a "Bridge" queue for broker federation, the destination broker hangs and
can only be stopped with a "kill -9".
> To reproduce:
> - Run two brokers.  Can be on the same host with different ports.
> - Using the mgmt-cli utility, invoke the "Connect" method on the destination broker using
the host and port of the source broker.
> - Find the resultant "link" object.
> - Invoke the "Bridge" method on the link object with the following arguments:
>         src  amq.direct  routing-key 0 0

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