Microsoft Technology Licensing, LLC

Denis Rystsov

Dharma Kiritkumar Shukla

Karthik Raman

Momin Mahmoud Al-Ghosien

Ji Huang

Shireesh Kumar Thota

Pankaj Sharma

Madhan Gajendran

Arsalan Ahmad

Hari Sudan Sundar

Sujit Vattathil Kuruvilla

Liang Li

Kiran Kumar Kolli

Mohammad Derakhshani

Swarnim Vyas

Data services are often provided with consistency guarantees of either strong consistency models, comprising uniform wall-clock consistency, or eventual consistency models, where temporary logical inconsistency is guaranteed to be resolved only after full data propagation. However, the performance characteristics of contemporary services often require an intermediate consistency model, where some aspects of the service have specific consistency expectations and other aspects of the service are flexible, such as bounded staleness (e.g., a maximum delay in reaching consistency); session consistency (e.g., individual sessions remain logically consistent, but ordering may vary across sessions); and prefix consistency (e.g., each view during a session is logically consistent, but ordering may vary between session views). Service guarantees may involve a selection within a range of consistency models that includes one or more intermediate consistency levels, and server configurations may be selected and applied to fulfill the intermediate consistency level selected in the service level agreement.

Intermediate consistency levels for database configuration

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Denis Rystsov