session-guarantees · shipping · also Session consistency guarantees

Session guarantees

Session guarantees are consistency contracts for a session's operations, including read-your-writes, monotonic reads, monotonic writes and writes-follow-reads.

Related Observatory article: Session guarantees on hesela.com

Specify the requested guarantees and how session context is retained. Implementations differ: Azure Cosmos DB uses partition-bound tokens; recreating a client loses its token cache. A session is not an atomic transaction, and its label alone does not specify a durability contract.

Relations

related

read-your-writes, monotonic-reads, monotonic-writes, writes-follow-reads

Citations

1. Douglas B. Terry et al. Session Guarantees for Weakly Consistent Replicated Data. PDIS 1994, sections 3.1-3.4, pp. 142-144. (accessed 2026-10-13)
2. MongoDB Manual: Read Isolation, Consistency, and Recency; client sessions, causal guarantees and isolation. (accessed 2026-10-13)
3. Storage consistency: ordering is not a transaction or a durability promise (accessed 2026-10-13)
4. Microsoft Learn: Consistency levels in Azure Cosmos DB; session consistency and partition-bound tokens. (accessed 2026-10-13)
5. MongoDB Manual: Causal Consistency and Read and Write Concerns; durability and rollback distinctions. (accessed 2026-10-13)

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