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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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Hash Functions

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One way functions that transfer character inputs to compressed output value named as hash functions. The input can be infinite(arbitrary), but the output always has a finite(fixed) set of characters. This produces a fingerprint of the file/message/data source: Wikipedia You cannot reverse the function and get the input value in Hash functions. If you have the content, you can use the hash function to calculate the hash value, but the other way around is not possible. If you have the hash value and the function, you can’t use it to get the input text. Below are sample scenarios that hash functions may become useless. If the function is reversible, it’s not secure. Hash values can be exposed to the public. Hence we don’t want someone seeing the hash value. The values may not collision resistant. There may be use cases with two unique input values return the same hash value. Since digital certificates/Signatures using hash fun...
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