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New Message Queuing Service from Amazon
Amazon has launched a beta of their new, shared, always on message queue service allowing developers to create applications distributed across the Internet without requiring a dedicated server to store the message. Implemented as a web service with examples in .NET (C#), this service is free to developers while in beta.
The Amazon Simple Queue Service offers a reliable, highly scalable hosted queue for buffering messages between distributed application components.
The web service API is fairly simple and includes the following functions:
- CreateQueue: Create queues for your own use, or to share with others.
- ConfigureQueue: Modify the properties of an existing queue.
- ListMyQueues: List your existing queues.
- DeleteQueue: Delete one of your queues.
- Enqueue: Add any data entries up to 4 KB in size to a specified queue.
- Read: Return data from a specified queue. No data-key is required, and data is returned in roughly the same order it was added to the queue.
- Dequeue: Remove a specified piece of data from a specified queue.
Read more about the Amazon Simple Queue Service here.
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Message #145169
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New Message Queuing Service from Amazon
This service is free to developers while in beta.
Can I also offer another free alternative, Web Service Message Queue (WSMQ) There is no hosted option, but the source code is free, as is the installation, and samples. .NET Framework is required.
This is great that the world is beginning to think of Web-Services for Queuing!
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Message #145285
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New Message Queuing Service from Amazon
That all sound great until I read:
Applications should be prepared for the event where the same message is read more than once from the queue. In particular: A message may be returned by Read even though it has already been dequeued; and concurrent Read calls may return the same message to multiple readers. This behavior is a result of prioritizing reliable data storage (even in the face of hardware failures), and we expect such events to occur very infrequently. One way applications can cope with these occasional duplicates is by making the messages stored in the queue idempotent – that is, by ensuring that the effect of repeated receipt of a message is the same as that of receiving it once.
This restriction makes it fairly unusable for a wide range of applications. E.g. if I have setup multiple message consumers who read messages from a queue and send emails/SMS etc., the "ideal" of a idempotent message queue cannot be achieved (or only by putting another message queue in between that supports different consumption models - which would defeat the purpose).
Is there any intent to deal with this issue?
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Message #145410
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why?
Just curious as to why amazon would be offering this service. It doesn't seem to have much to do with retail sales. Any ideas?
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Message #145430
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New Message Queuing Service from Amazon
This restriction makes it fairly unusable for a wide range of applications
Even if the messaging implementation can guarantee once and only once delivery, in reality, a lot of applications still need to be able to deal with duplicate messages.
Even with once and only once delivery semantics, there is usually the case the the message producers are capabable of producing duplicate messages...
Ultimately, with messaging, its not possible to scale (storage and bandwidth) and provide seemless failover and provide Once And Only Once delivery semantics. Something has to give...
-Nick
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Message #145441
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New Message Queuing Service from Amazon
This restriction makes it fairly unusable for a wide range of applications Even if the messaging implementation can guarantee once and only once delivery, in reality, a lot of applications still need to be able to deal with duplicate messages.Even with once and only once delivery semantics, there is usually the case the the message producers are capabable of producing duplicate messages...Ultimately, with messaging, its not possible to scale (storage and bandwidth) and provide seemless failover and provide Once And Only Once delivery semantics. Something has to give...-Nick
Nick, from what I recall is you are fairly with JMS. I understand that from a producer side you cannot prevent duplicate messages. From a consumer side messaging should be fairly capable of scaling and failover, right? I tinkered around for a while with OpenJMS and that worked very well (with fairly small messages in a PTP queue which require very time/processor extensive processing). What are the problems here? Is it the ack?
I think the same would be nice in the amazon example. You receive a message from a queue (which locks it), process it and when you're done you either acknowledge successful execution (ie deleting the message) or you "rollback" (ie unlock it).
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Message #309756
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