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From Ramit Arora <ramit.ar...@gmail.com>
Subject Re: Implementing failover for Net::Stomp
Date Wed, 26 Mar 2008 06:55:22 GMT

Hello Dejan,
I had a look at the PHP client. I was following a similar approach, but the
major problem was that the ActiveMQ shutdown hook was enabled, which did not
let the socket close for around 10secs. Disabling it has made things a lot
better. Thanks for your time.

Regards,
Ramit

Dejan Bosanac wrote:
> 
> Hi Ramit,
> 
> you can take a look at how this functionality is implemented in PHP
> client (http://stomp.codehaus.org/PHP+Connectivity). Basically, you
> can detect that broker is down when you try to read/write from a
> socket and implement reconnection logic in those cases. BTW. error
> frames are sent to the client only in ActiveMQ 5.1 and in case you
> have sent receipt header with your command.
> 
> Cheers
> -- 
> Dejan Bosanac
> www.scriptinginjava.net
> 
> On Fri, Mar 21, 2008 at 11:35 PM, Ramit Arora <ramit.arora@gmail.com>
> wrote:
>>
>>  Sure thing man, but I'll have to work this thing out first....
>>  I think it can be achieved if the broker sends the client an ERROR frame
>>  when it detects a shutdown in progress. My experiments show that the
>> broker
>>  currently does not send any notification to a Stomp client while
>> shutting
>>  down. Can someone from the development team confirm this? And would it
>> be
>>  possible for the broker to send a notification while shutting down to
>> Stomp
>>  clients so that failover can be implemented?
>>  Any other ideas for this will be greatly appreciated.
>>
>>  TIA,
>>  Ramit
>>
>>
>>
>>
>>  Llarian wrote:
>>  >
>>  > If you get this worked out, would you be willing to release your
>>  > Net::Stomp hacks?
>>  >
>>  > I'm desperatly needing HA for my perl publishers (and subscribers for
>> that
>>  > matter), but I don't have the hours to do it in house at the moment.
>>  >
>>  > -D
>>  >
>>  >> -----Original Message-----
>>  >> From: Ramit Arora [mailto:ramit.arora@gmail.com]
>>  >> Sent: Friday, March 21, 2008 1:50 PM
>>  >> To: users@activemq.apache.org
>>  >> Subject: Implementing failover for Net::Stomp
>>  >>
>>  >>
>>  >>
>>  >> Hi,
>>  >> I am using ActiveMQ 5.0.0. My application requires Perl
>>  >> publishers & Java
>>  >> subscribers. Since HA is a necessity, I wish to implement failover
>>  >> capability in the Net::Stomp client for Perl.
>>  >> I've already come up with a basic solution, but I am facing
>>  >> the following
>>  >> problem:
>>  >> I use the pipe broken signal to detect master broker failure
>>  >> from perl. The
>>  >> pipe does not break until the master shuts down its Stomp
>>  >> connector. If I
>>  >> abruptly shut down the master (power down or kill -9), then
>>  >> there is no
>>  >> issue. But if I cleanly shutdown the master (^C), then the
>>  >> master does not
>>  >> shut down its Stomp connector until it has done its cleanup.
>>  >> This normally
>>  >> takes around 10secs. This results in the Perl client sending
>>  >> messages to the
>>  >> broker for those crucial ten seconds. These messages are lost & not
>>  >> delivered to the Java client.
>>  >> Is there are any other way of detecting that the master is
>>  >> shutting down?
>>  >> Perhaps something using the STOMP ERROR frame?
>>  >>
>>  >> TIA,
>>  >> Ramit
>>  >> --
>>  >> View this message in context:
>>  >> http://www.nabble.com/Implementing-failover-for-Net%3A%3AStomp
>>  > -tp16207964s2354p16207964.html
>>  > Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>>  >
>>  >
>>  >
>>
>>  --
>>  View this message in context:
>> http://www.nabble.com/Implementing-failover-for-Net%3A%3AStomp-tp16207964s2354p16210250.html
>>
>>
>> Sent from the ActiveMQ - User mailing list archive at Nabble.com.
>>
>>
> 
> 
> -----
> Dejan Bosanac
> www.scriptinginjava.net
> 

-- 
View this message in context: http://www.nabble.com/Implementing-failover-for-Net%3A%3AStomp-tp16207964s2354p16296589.html
Sent from the ActiveMQ - User mailing list archive at Nabble.com.


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