Microsoft Technology Licensing, LLC

Peng Song

Li Zhang

Rui Wang

Mihail Gavril Tarta

Qun Guo

Dennis Tighe

Lidan Miao

Gopal Ashok

A model checking system is described herein that more effectively verifies and validates the design of distributed applications by providing a model and a generic framework to check application invariant properties, detect anomaly behaviors, and monitor application health. The model checking system checks on-line application behavior against application models derived from formal descriptions of the application. The system formulates the concrete application as an abstract model and a number of rules or properties that are expected to hold for the application under all conditions. The model checker compares the actual application execution with the models and either confirms that the properties hold true or reports that the properties are violated. Thus, the model checking system provides more efficient and thorough validation of distributed applications under more realistic production conditions.

Model checking for distributed application validation

Systems and methods that supply changes on-the-fly and without breaking execution of codes for schema changes in a peer-to-peer environment. The modification component supplies changes to peers or nodes in a topology by initially identifying dependencies (e.g., multiple level) that can be affected by the schema change, followed by performing the schema change to the codes or stored procedures. Accordingly, dependencies in an entire system can be refreshed, wherein multiple levels of dependencies can exist.

Multiphase topology-wide code modifications for peer-to-peer systems

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Issaquah, WA, United States of America

Peng Song