By Rogério de Lemos, Cristina Gacek, Alexander Romanovsky
As software program platforms develop into ubiquitous, the problems of dependability turn into increasingly more severe. on condition that suggestions to those matters needs to be taken into consideration from the very starting of the layout strategy, it really is acceptable that dependability is addressed on the architectural point. This book results from an attempt to assemble the learn groups of software program architectures and dependability. encouraged by way of the ICSE 2003 Workshop on software program Architectures for accountable platforms, the booklet makes a speciality of issues appropriate to bettering the cutting-edge in architecting liable platforms. The 15 completely reviewed papers originate partially from the workshop; others have been solicited as a way to in achieving entire assurance of all proper features. The papers are equipped into topical sections on architectures for dependability, fault-tolerance in software program architectures, dependability research in software program architectures, and business event.
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Extra info for Architecting Dependable Systems II
Using the pre-computed approximation of the related service failure rate can be determined and propagated to the parameter adaptation unit. There, the approximation of is again used to determine the parameter to reach the assigned availability goal Fig. 7. Self-optimizing availability controller 5 Ensuring Reliability of Application Services As outlined in the preceding section, the presented infrastructure of the architecture can ensure a required degree of availability for a group of application services by restarting failed ones.
The overhead imposed by the configurator’s operations (finding the rules, passing action parameter values, and creating coordination contract objects) does not have a major impact into the overall execution time of the application and processing services. This is both true for the interactive and batch parts of the system. In the former case, the user does not notice any delay in the system’s reply, in the latter case, the time of generating the SQL procedures is negligible compared to the time they will execute over the hundreds of thousands of records in the database.
This information has to be read prior to (re)starting them. Each instance of the service description storage contains one replica of the service descriptions. A strong consistency model for these data is required since a weaker consistency model would result in a possible loss of service descriptions in case of failures. This in turn would cause the unavailability of the affected application services, since no repair is possible due to the lost service descriptions. Thus, reading the descriptions is more important than writing.