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From Shan Wang <Shan.W...@igindex.co.uk>
Subject RE: An ill borker brings down the whole cluster
Date Tue, 03 Nov 2009 17:02:02 GMT
So even if heartbeat isn't set, the client can still failover to another broker after some
default timeout?

Don't quite understand how could broker release resources based on heartbeat, isn't heartbeat
used by client to detect the outage of a broker? Does broker also listen a heartbeat sent
by client?

A more important question to me is, will two qpid-tool conflict while each monitoring the
same queue name on one broker of the cluster?

-----Original Message-----
From: Carl Trieloff [mailto:cctrieloff@redhat.com]
Sent: 03 November 2009 16:34
To: dev@qpid.apache.org
Subject: Re: An ill borker brings down the whole cluster


The main reason for setting heartbeat is to fail the client from one
node of the cluster to another faster + have the broker 'release' any
resources fro re-use associated with that session, for example
'exclusive' queues.

In connection settings:

    uint16_t heartbeat;
    /**
     * The maximum number of channels that the client will request for
     * use on this connection.
     */

http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/1.1/html/MRG_Messaging_Qpid_C++_API_Reference/a00037.html
or
http://qpid.apache.org/docs/api/cpp/html/a00226.html

Carl.



Shan Wang wrote:
> Hmm...so what will happen if I don't set it? In the c++ API doc from redhat, there's
nowhere mentioning this heartbeat, I only get this from the qpid FAQ. I tested the cluster
by cleanly shutdown one broker while producing a lot of messages to a queue, the other broker
still works fine and no messages were lost.
>
>
>
> -----Original Message-----
> From: Gordon Sim [mailto:gsim@redhat.com]
> Sent: 03 November 2009 15:32
> To: dev@qpid.apache.org
> Subject: Re: An ill borker brings down the whole cluster
>
> On 11/03/2009 02:43 PM, Shan Wang wrote:
>
>> I haven't set any heartbeat in ConnectionSettings explicitly, the cluster worked
most of the time, so I guess the default heartbeat interval is fine.
>>
>
> By default heartbeats are not used for the c++ client. You must set the
> interval in ConnectionSettings to turn them on.
>
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The information contained in this email is strictly confidential and for the use of the addressee
only, unless otherwise indicated. If you are not the intended recipient, please do not read,
copy, use or disclose to others this message or any attachment. Please also notify the sender
by replying to this email or by telephone (+44 (0)20 7896 0011) and then delete the email
and any copies of it. Opinions, conclusions (etc.) that do not relate to the official business
of this company shall be understood as neither given nor endorsed by it. IG Index Ltd is a
company registered in England and Wales under number 01190902. VAT registration number 761
2978 07. Registered Office: Friars House, 157-168 Blackfriars Road, London SE1 8EZ. Authorised
and regulated by the Financial Services Authority. FSA Register number 114059.

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