Re: XML Feeds vs SQL Queries
Elliotte Harold wrote: > I've been neck deep in messaging systems for the last two months, and > "reliable" is the last word I'd use to describe them. The first word > I'd use? It's hard to pick, but "annoying", "hideous", "buggy" and > "error-prone" all come to mind. We're getting ready to rip out the > messaging system completely because it just can't handle, well, anything. Like Mike Kay, I use "messaging systems" as a synonym for "reliable messaging systems". I think you're neck-deep in the wrong systems. Time for a better open source solution? > Possibly if you've got the budget for MQSeries and multiple expensive > professionals dedicated to babysitting it full-time, you can make > messaging reliable. I've certainly heard bedtime stories about > companies that run like that; but on anything approximating a startup > or small business budget, messaging is a sure-fire way to kill a system. Yes, reliable messaging systems have traditionally been expensive and difficult to administer. You had to either spend a lot of money, or use a system that wasn't up to the task - which is precisely why AMQP is being developed as an open messaging standard. To steal a paragraph from something I wrote: > Messaging is a crucial component for enterprise and high-performance > computing, SOA deployments, and platform services. Until recently, > enterprise-level messaging systems were proprietary, mutually > incompatible, and quite expensive. Open messaging systems existed, but > until now, they did not offer the reliability or performance needed > for demanding applications. Red Hat Messaging offers the > predictability, high speed, reliability, security and scalability > needed for enterprise-level messaging in an open-source product with > multi-vendor interoperability. This is still pre-release, and there's not much in the way of documentation or examples, but AMQP is already being used in production systems, where it is serving very high message volumes. For example, one bank has a worldwide deployment that delivers over 100 million messages per day in a 7 hour trading window in its Tokyo hub. Apache Qpid and Red Hat Messaging, which builds on Apache Qpid to optimize it for Linux and add functionality beyond that of Qpid, are open source implementations that are being used in production now. Clients are available in C++, Java, Python, and Ruby. One way to use AMQP is to write to the JMS API, which Qpid supports. That gets you better speed and reliability using a familiar API. Jonathan
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