March 2008
Intermediate to advanced
604 pages
18h 38m
English
Content preview from Programming Amazon Web ServicesBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Messages
A message is a distinct piece of information transmitted by one client that can be received by one or more other clients. Each SQS message is identified by an ID value generated by the service. A message’s ID uniquely identifies that message within a queue, and the combination of a queue URL and a message ID can uniquely identify any message in SQS.
There is no limit to the number of messages that can be sent to SQS queues, nor to the number that may remain stored in queues pending delivery. Messages cannot be left in the service indefinitely; they will be automatically deleted after 15 days or so.
Warning
SQS does not include a timestamp with messages to indicate when a particular message was sent. This makes it difficult to check whether your queues contain messages that are nearly 15 days old. SQS is not intended for long-term data storage, so you must be prepared for very old messages to be deleted.
Messages have a maximum size of 256 KB. This size limit is not large by the standards of alternative messaging systems, and it clearly indicates Amazon’s intentions for how its messaging service should be used. SQS is not intended to serve as a means for distributing files or transmitting large data objects; it is intended to carry short notifications or instruction messages that refer to data resources stored outside the SQS service, for example, in the Simple Storage Service (S3).
The data content of SQS messages must be unicode text characters that are legal for standard XML ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.