[rabbitmq-discuss] Message wait time in a queue

On Feb 7, 11:28?am, Jerry Kuch wrote:
Hi, Rasadoll...

Do you really want to measure the time spent in a queue by the
message and do something with that information or do you just want
messages to vanish after they get appropriately stale? ?If the
latter, check out:

http://www.rabbitmq.com/extensions.html

And check out the "Per-Queue Message TTL" session. ?It describes
a RabbitMQ extension to AMQP that lets you declare a queue with
a new argument, x-message-ttl, that controls how long a message
published to that queue can live before the broker discards it.
Messages that have exceeded the TTL set for their queue are
considered dead, won't be delivered to consumers, and will
be expunged periodically.

Note that you specify the TTL in *milliseconds*... :-)

Best regards,
Jerry







----- Original Message -----
From: "rasadoll" <rasad... at gmail.com>
To: rabbitmq-disc... at lists.rabbitmq.com
Sent: Tuesday, February 7, 2012 8:11:33 AM
Subject: [rabbitmq-discuss] Message wait time in a queue

Hi,

How can we measure how long a message has been in a queue before it is
delivered to a consumer? If the message was in a queue for more than a
certain amount of time we would like to ignore it for example. Our
message publisher and consumers are on different machines and we
cannot synchronize their clocks, so the publish time cannot be set by
the publisher and checked by the consumer. Is there any way to get
this information from RabbitMQ?

Thanks,
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On 7 Feb 2012, at 17:05, rasadoll wrote:

Thanks Jerry,
Your direction would help us to partially address our problem, but we
are still interested about the wait time to further optimize our
system. We know the time to process and ack a message but we don't
know how long it took to start its processing.

On Feb 7, 12:16?pm, Ask Solem wrote:
You could add a timestamp to the message headers when you publish the message,
the subtract that when you consume it.
Of course then the time will include the time it took to send the message, but
that is probably not an issue?

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On Feb 7, 2012, at 5:22 PM, rasadoll wrote:

If the publisher and consumer are on different machines, this approach
will not work correctly as their clocks are not synchronized.

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