[rabbitmq-discuss] Confusing disk free space limit warning
mark.hingston at vardr.com
Tue Sep 18 08:11:33 BST 2012
On 18/09/12 3:46 PM, Matthias Radestock wrote:
>>> So your question really comes down to how would you expect a client to
>>> detect and deal with a slow server / congested network.
>> Thanks for the explanation. I guess now I'm trying to figure out what
>> the best way is to defend against this situation so that my messages
>> don't get lost.
> As you noted, publisher confirms would be one way and are definitely
> the way to go when wanting to ensure that no messages are lost, ever,
> on their delivery to rabbit. I don't know about their status in celery.
> However, before you go down that route, consider carefully what other
> failure modes there are in your system. It's all very well to ensure
> that the message delivery to rabbit is reliable, but if the connecting
> application can explode and lose messages then that may not actually
> gain you very much.
> On the rabbit/connection side, messages will only be lost if the
> connection is dropped or rabbit encounters some catastrophic internal
> error. Alarm conditions are transitory, i.e. you can recover from them
> w/o restarting rabbit, by, say, consuming messages (to free up memory)
> or clearing some disk space.
> So depending on how reliable your network and machines are (and
> leaving aside the alarm-handler-killing stomp bug), the most likely
> place for messages to get dropped may not actually be on the rabbit side.
Thanks for that - I'll keep it in mind. I've raised the question of how
best to handle this situation when running celery in this thread over at
the celery group:
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