[rabbitmq-discuss] Re try and Throttling

Wed Mar 9 16:39:13 GMT 2011

On Wed, Mar 9, 2011 at 15:00, butterdave2 <mark.pork at gmail.com> wrote:
>
> What about simulating a delay by not republishing a message back (via
> channel.basicReject) onto the queue by the Consumer code? If I'm not
> mistaken, as long as the Channel is kept alive, that message can be held out
> of the queue indefinitely.

This is correct if you're using acknowledgments.

> On another note, could a new plugin provide the global delay settings on
> Rabbit?

I don't think that's possible.

> Marek Majkowski wrote:
>>
>> On Tue, Mar 8, 2011 at 16:08, butterdave2 <mark.pork at gmail.com> wrote:
>>>
>>> Is there anything in Rabbit that can control the amount of times a
>>> consumer
>>> may "retry" a message?
>>
>> No, but if the message is redelivered you should see "redelivered"
>> field being set
>> to "True".
>>
>>> There may be instances when a message has something about it that will
>>> cause
>>> it to "fail" downstream in the Consumer code. I wouldn't want to continue
>>> to
>>> hammer away...
>>
>> Correct. But rabbit can't know if your consumer died due to the message
>> or due to something else, power failure or something.
>>
>> It's the programmers responsibility to handle dying-consumer case.
>>
>>> I can programmatically include the number of retry attempts with the
>>> message
>>> (a kind of metadata) and then design the Consumer to query this field.
>>> (then
>>> once we hit our MAX_RETRY, we will do something else to it...)
>>
>> Sounds good.
>>
>>> Also in similar fashion, is there any control around "throttling" or
>>> slowing
>>> down the consumption of messages from a queue?
>>
>> You can't control that, Rabbit is designed to deliver messages when it
>> can.
>> But you can use basic.qos to do something similar. Or, if you're desperate
>> you may just run basic.get with regular intervals.
>>
>> Cheers,
>>   Marek
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>>
>>
>
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