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Software Fault Tolerance
Software fault tolerance is the ability of computer software to continue its normal operation despite the presence of system or hardware faults. Fault-tolerant software has the ability to satisfy requirements despite failures. Following design patterns should be combined together to make the system more fault tolerant: retry, fallback, timeout, circuit breaker, and bulkhead pattern. To make your system more fault tolerant, you should measure 99th percentile latency and keep the remaining 1% (aka tail latencies) in check through self healing mechanisms. Introduction The only thing constant is change. This is certainly more true of software systems than almost any phenomenon, not all software change in the same way so software fault tolerance methods are designed to overcome execution errors by modifying variable values to create an acceptable program state.Ray Giguette and Johnette Hassell, “Toward A Resourceful Method of Software Fault Tolerance”, ACM Southeast regional co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Computer Software
Software consists of computer programs that instruct the Execution (computing), execution of a computer. Software also includes design documents and specifications. The history of software is closely tied to the development of digital computers in the mid-20th century. Early programs were written in the machine language specific to the hardware. The introduction of high-level programming languages in 1958 allowed for more human-readable instructions, making software development easier and more portable across different computer architectures. Software in a programming language is run through a compiler or Interpreter (computing), interpreter to execution (computing), execute on the architecture's hardware. Over time, software has become complex, owing to developments in Computer network, networking, operating systems, and databases. Software can generally be categorized into two main types: # operating systems, which manage hardware resources and provide services for applicat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Backup
In information technology, a backup, or data backup is a copy of computer data taken and stored elsewhere so that it may be used to restore the original after a data loss event. The verb form, referring to the process of doing so, is "wikt:back up, back up", whereas the noun and adjective form is "wikt:backup, backup". Backups can be used to data recovery, recover data after its loss from File deletion, data deletion or Data corruption, corruption, or to recover data from an earlier time. Backups provide a simple form of IT disaster recovery; however not all backup systems are able to reconstitute a computer system or other complex configuration such as a computer cluster, active directory server, or database server. A backup system contains at least one copy of all data considered worth saving. The computer data storage, data storage requirements can be large. An information repository model may be used to provide structure to this storage. There are different types of data stor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Software Quality
In the context of software engineering, software quality refers to two related but distinct notions: * Software's functional quality reflects how well it complies with or conforms to a given design, based on functional requirements or specifications. That attribute can also be described as the fitness for the purpose of a piece of software or how it compares to competitors in the marketplace as a worthwhile product. It is the degree to which the correct software was produced. * Software structural quality refers to how it meets non-functional requirements that support the delivery of the functional requirements, such as robustness or maintainability. It has a lot more to do with the degree to which the software works as needed. Many aspects of structural quality can be evaluated only statically through the analysis of the software's inner structure, its source code (see Software metrics), at the unit level, and at the system level (sometimes referred to as end-to-end testin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
OpenSAF
OpenSAF (commonly styled SAF, the Service Availability Framework) is an open-source software, open-source Service-oriented architecture, service-orchestration (computing), orchestration system for automating computer application software, application deployment, scaling, and management. OpenSAF is consistent with, and expands upon, Service Availability Forum, Service Availability Forum (SAF) and SCOPE Alliance standards. It was originally designed by Motorola, Motorola ECC, and is maintained by the OpenSAF Project. OpenSAF is the most complete implementation of the Service Availability Forum, SAF AIS specifications, providing a platform for automating deployment, scaling, and operations of application services across clusters of hosts. It works across a range of virtualization tools and runs services in a cluster, often integrating with Java virtual machine, JVM, Vagrant (software), Vagrant, and/or Docker (software), Docker runtimes. OpenSAF originally interfaced with standard C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
