consistency

CAP theorem - Availability and Partition Tolerance

由 流过昼夜 提交于 2019-11-27 16:34:45
While I try to understand the "Availability" (A) and "Partition tolerance" (P) in CAP, I found it difficult to understand the explanations from various articles. I get a feeling that A and P can go together (I know this is not the case, and that's why I fail to understand!). Explaining in simple terms, what are A and P and the difference between them? Chris Heald Consistency means that data is the same across the cluster, so you can read or write from/to any node and get the same data. Availability means the ability to access the cluster even if a node in the cluster goes down. Partition

CAP theorem - Availability and Partition Tolerance

由 不问归期 提交于 2019-11-26 18:43:09
问题 While I try to understand the "Availability" (A) and "Partition tolerance" (P) in CAP, I found it difficult to understand the explanations from various articles. I get a feeling that A and P can go together (I know this is not the case, and that's why I fail to understand!). Explaining in simple terms, what are A and P and the difference between them? 回答1: Consistency means that data is the same across the cluster, so you can read or write from/to any node and get the same data. Availability

Why were ES5 Object methods not added to Object.prototype?

由 て烟熏妆下的殇ゞ 提交于 2019-11-26 12:32:01
问题 ES5 added a number of methods to Object , which seem to break the semantic consistency of JavaScript. For instance, prior to this extension, the JavaScript API always revolved around operarting on the object itself; var arrayLength = [].length; var firstPosInString = \"foo\".indexOf(\"o\"); ... where as the new Object methods are like; var obj = { }; Object.defineProperty(obj, { value: \'a\', writable: false }); ... when the following would have been much more conformative: var obj = { }; obj
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