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CAP THEOREM

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What’s C, A and P? Consistency is the easiest one. It roughly means that the clients get the same view of data. By saying that a system is consistent we often mean strong consistency, but it also can come in different flavors. Availability is a property saying that every request to a non-failing node will return a (meaningful) response. The response may not contain all data (so the harvest will not be 100%), but it should be useful for the client. Partition tolerance means that the system will continue working even if any number of messages sent between nodes is lost. This can be e.g. a network failure between two data centers, where nodes in each data center form a partition. Also note that a failure of any number of nodes forms a partition (it is not possible to distinguish between a network failure and a node failing and stopping to respond to messages). The basic statement of the CAP theorem is that, given the three properties of Consistency, Availability, and Pa...
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Quality Assurance in Agile Software Development

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What is software ‘Quality’? Quality software is reasonably bug-free, delivered on time and within budget, meets requirements and / or expectations, and is maintainable.Actually it is a subjective term. It’ll depend on who the ‘customer’ is and their overall influence in the scheme of things. Each type of customer will have their own slant on quality of the software. A wide angle view of the customers of a software development project might include end-users, customer acceptance testers, customer contract officers, customer’s management, the development organization’s management / accountants / testers / salespeople, future software maintenance engineers, stockholders, magazine columnists, etc. image courtesy: radiotherapie centre hospitalier university some of the software quality indicators are... progress of development stability of the software process compliance quality, evaluation effort Test coverage Defect detection efficiency ...
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How you can manage throttle out errors in WSO2 API Manager

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You might face the above-mentioned error if you have an application in Dialog Ideabiz platform.Let’s start from the beginning. Once you create an application on Ideabiz, you need to subscribe to the APIs you require. We use WSO2 API manager to manage the APIs . When admin approves your API subscriptions, he/she will assign a tier value for each API(5tps, 10 tps etc.). Also, they will assign a tier value for the application as well. Let’s assume you wanted to create an application by using SMS and Payment API. The team has assigned 5tps for each API and 10tps for your application. You use SMS API only to send SMS to the users and payment API to charge the users on daily basis. When considering each API, (as per above example) you should manage  5 transactions per second in the SMS API. Which means you can have 5 API calls per second. Let’s assume before you send the SMS, you want to charge Rs 1 from the user. Therefore you need to call payment API as well. Since th...
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