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From ffrenchm <ffrench.mathi...@gmail.com>
Subject Re: QPID C++ Broker + persistent store
Date Mon, 23 Feb 2009 17:00:24 GMT

I'm currently working on a JMS client. I suppose that the equivalent of C++
async session is a DUPS_OK_ACKNOWLEDGE session (I'm not sure) ...

++


Carl Trieloff wrote:
> 
> 
> yes, for example in c++ there is a sync and async session. The async one 
> return after calling and
> allows another message to be sent. Errors or handled async. sync session 
> blocks on the call.
> 
> The sync / flush commands can be used to control this yourself if you want
> 
> This type of thing can be done from any client, which client do you care 
> about?
> Carl.
> 
> 
> ffrenchm wrote:
>> Ok I understand your answer, but it raise me another question :) Is there
>> a
>> way to have a really asynchronous client/server communication when
>> putting
>> messages ? I mean the client send a message and then the server ack the
>> client without waiting that the message is on the disk ?
>>
>> Thanks ...
>>
>>
>> Carl Trieloff wrote:
>>   
>>>     
>>>> Well, I do not understand why the synchronous IO mode is no longer
>>>> supported. My experiences of queueing tell me that if you want really
>>>> safe
>>>> message store you need synchronous IO on message PUT. But maybe did I
>>>> miss
>>>> some new things which make this feature deprecated ?
>>>>
>>>>   
>>>>       
>>> This is a great question:
>>>
>>> The key is that the C++ broker is that it is an async process, so the 
>>> broker has all the logic to know when all the async processing on a 
>>> message is complete. So even with a async store, the broker will not ack 
>>> the client until the message/update is physically written to disk. Given 
>>> this there is no advantage to a sync mode. Async is faster in all cases 
>>> - and all the exact same message guarantees are provided using  async.
>>>
>>> The only reason the sync option was there was to enable testing while 
>>> the async impl was been hardened.
>>>
>>> regards
>>> Carl.
>>>
>>>
>>>
>>>
>>>
>>>
>>> ---------------------------------------------------------------------
>>> Apache Qpid - AMQP Messaging Implementation
>>> Project:      http://qpid.apache.org
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>>>
>>>
>>>
>>>     
>>
>>   
> 
> 
> 

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