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From Gaurav Sharma <gaurav.cs.sha...@gmail.com>
Subject Re: Default JMX Connectors Failover for JDBC Master Slave
Date Wed, 05 Sep 2012 22:31:09 GMT
Gary - Thanks for the pointers. For my in-house work, I am testing
with the comma-separated list of jmx url's and just establishing
connections to them in-order and returning the MBeanServerConnection
for the first one that works. I also have a daemon thread to monitor
this connection failure and try the others in the list.. in a way,
simulating the failover transport like for the broker url's.

I looked at the RemoteJMXBrokerFacade but it is very high up residing
in the web module. Should I create a ticket for 'core' to implement a
failover-transport like implementation for the JMX URL's?
Thank you.


On Wed, Sep 5, 2012 at 4:11 AM, Gary Tully <gary.tully@gmail.com> wrote:
> hmm. I see we already have an issue for the RemoteJMXBrokerFacade  at
> https://issues.apache.org/jira/browse/AMQ-2785
> vote it up I guess or if you can, submit a patch. All contributions
> most welcome.
>
> On 5 September 2012 12:00, Gary Tully <gary.tully@gmail.com> wrote:
>> There is no easy solution for this at the moment.
>>
>> Since https://issues.apache.org/jira/browse/AMQ-2306 both the master
>> and slave expose them selves over JMX so both urls will be valid.
>> The difference is that only one will report isSlave==false
>>
>> There is a jmx facade used by the web console that could be useful if
>> your client has java code, but it needs some additional smarts to be
>> aware of the isSlave attribute on a broker.
>>
>> Currently it is happy if it finds a broker MBean.
>>
>> Have a peek at:
>> org.apache.activemq.web.RemoteJMXBrokerFacade#createConnection in [1]
>>
>> Seems like that facade needs to be able to iterate through the list of
>> urls or restrict access to just the master. I think it would make a
>> sensible enhancement.
>>
>> [1] http://svn.apache.org/viewvc/activemq/trunk/activemq-web/src/main/java/org/apache/activemq/web/RemoteJMXBrokerFacade.java?view=markup
>>
>> On 5 September 2012 06:18, Gaurav Sharma <gaurav.cs.sharma@gmail.com> wrote:
>>> For the JDBC Master Slave config, just like there exists the Failover
>>> Transport for the broker url, what is the best way to specify the JMX
>>> hosts in a properties file:
>>> jmxUrl=service:jmx:rmi:///jndi/rmi://<host1>:1616/jmxrmi, \
>>>            service:jmx:rmi:///jndi/rmi://<host2>:1616/jmxrmi, \
>>>            service:jmx:rmi:///jndi/rmi://<host3>:1616/jmxrmi
>>>
>>> so that I don't have to worry about managing 3 MBeanServerConnection's
>>> in my code and then trying to figure which one is the master or which
>>> one is alive, re-election, etc? The alternative of managing the three
>>> references and error-handling, is just messier.
>>>
>>> Thanks in advance for the help.
>>>
>>> -gaurav
>>
>>
>>
>> --
>> http://fusesource.com
>> http://blog.garytully.com
>
>
>
> --
> http://fusesource.com
> http://blog.garytully.com

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