We describe attempts to build an application-independent model to support reconciliation of diverged replicas of shared objects. While replicas are disconnected from one another, actions on the shared objects are recorded in a log. An action is composed of a precondition, an operation and a post condition. When reconnecting, the system attempts to reconcile the divergent replicas, in several phases. A symbolic phase merges the separate logs, creating one or more schedules, such that preconditions from one log remain true despite the preconditions introduced by the other. Then, a simulation phase checks the possible outcomes by actually applying the schedules to scratch copies of the shared objects. Finally, a selection phase allows users or applications to select one of the candidate schedules.<\/p>\n
Our approach supports sharing general objects, where one update may reference multiple objects (not just a single file or database). Compared to previous work on log-based reconciliation, our logs capture more semantic information and provide the application with more powerful and finer control over the outcome of reconciliation.<\/p>\n","protected":false},"excerpt":{"rendered":"
We describe attempts to build an application-independent model to support reconciliation of diverged replicas of shared objects. While replicas are disconnected from one another, actions on the shared objects are recorded in a log. An action is composed of a precondition, an operation and a post condition. When reconnecting, the system attempts to reconcile the […]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":null,"msr_publishername":"ACM","msr_publisher_other":"","msr_booktitle":"Proc. SIGOPS European Workshop: \"Beyond the PC: New Challenges for the Operating System\"","msr_chapter":"","msr_edition":"Proc. 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