{"id":97,"date":"2003-02-18T12:47:00","date_gmt":"2003-02-18T16:47:00","guid":{"rendered":"http:\/\/www.markbaker.ca\/wp\/?p=216"},"modified":"2003-02-18T12:47:00","modified_gmt":"2003-02-18T16:47:00","slug":"reliability-provisions","status":"publish","type":"post","link":"http:\/\/www.markbaker.ca\/blog\/2003\/02\/reliability-provisions\/","title":{"rendered":"Reliability provisions"},"content":{"rendered":"

Werner Vogels comments<\/a>\non my argument against reliable messaging. I’m not sure he read it in its\nentirety though, as he leads off by saying;<\/p>\n\n

\nI was surprised to read Mark Baker’s statement that he feels there is no need for reliable communication provisions in web-services runtimes.\n<\/blockquote>\n\n

Which isn’t the case, because I said that HTTP could do with some\nreliability help. What I’m against is the specific solution of an\napplication-independant reliable messaging layer. There are other\nways of achieving the same goals, though at the expense of application\nprotocol neutrality (see below).<\/p>\n\n

I fully understand that some of Werner’s work, and pretty much the\nwhole group communications style of distributed computation, builds upon\nthe reliability-as-a-layer approach. I studied his work, and the work\nof his group at Cornell under Birman<\/a>,\nand even developed code with the Isis\ntoolkit. But GCS doesn’t scale up to the size of system I’m interested in,\nor that Web services are struggling to be. Perhaps it has a role in the\nLAN, or in other small group environments though. It’s definitely cool tech.<\/p>\n\n

I’m for “doing reliability” in the application layer,\nby coordination, with a coordination language in the guise of an application\nprotocol. As I mentioned above, that means disposing of the notion of\ndoing it in a protocol-neutral manner, in so far as application protocols\ndefine the application. So basically that means ensuring that when you design\nan application protocol, it’s able to give you the reliability semantics\nyou need (within the realm of possibility, as we seem to agree on 8-), or can\nbe extended to do so. HTTP is such a protocol for the hypermedia application\nmodel. The interesting question is, how general is the hypermedia application\nmodel, and is it relevant to your problem? I say, yes, there’s a good chance\nit is relevant, and it’s certainly relevant for Web services.<\/p>","protected":false},"excerpt":{"rendered":"Werner Vogels comments on my argument against reliable messaging. I’m not sure he read it in its entirety though, as he leads off by saying; I was surprised to read Mark Baker’s statement that he feels there is no need for reliable communication provisions in web-services runtimes. Which isn’t the case, because I said that […]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-97","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"http:\/\/www.markbaker.ca\/blog\/wp-json\/wp\/v2\/posts\/97","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.markbaker.ca\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.markbaker.ca\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.markbaker.ca\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.markbaker.ca\/blog\/wp-json\/wp\/v2\/comments?post=97"}],"version-history":[{"count":0,"href":"http:\/\/www.markbaker.ca\/blog\/wp-json\/wp\/v2\/posts\/97\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.markbaker.ca\/blog\/wp-json\/wp\/v2\/media?parent=97"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.markbaker.ca\/blog\/wp-json\/wp\/v2\/categories?post=97"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.markbaker.ca\/blog\/wp-json\/wp\/v2\/tags?post=97"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}