Client sessions, multi-document transactions, and retryable writes - #2883
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gedaiu wants to merge 2 commits into
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Client sessions, multi-document transactions, and retryable writes#2883gedaiu wants to merge 2 commits into
gedaiu wants to merge 2 commits into
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…nitoring, primary write-routing Reworks the MongoDB driver onto a Server Discovery and Monitoring (SDAM) foundation: single-pass topology discovery, background health monitoring, writes routed to the primary, per-query read preferences, and read-preference tag server selection. Adds the wire/codec and topology infrastructure (serverdescription, monitor, wire, wireversion, compression, commands, clustertime) and reworks connection/client/collection/database/cursor onto it. Base of a stacked series: client sessions, multi-document transactions and retryable writes follow in the next PR, and the self-contained MongoDB 8 features (change streams, client bulkWrite, GridFS, CSFLE, Stable API, mongodb+srv, load-balancer mode) as PRs on top of that. Closes vibe-d#2845, vibe-d#2847, vibe-d#2848, vibe-d#2849, vibe-d#2851
…writes Adds client session support (logical session ids backed by a server session pool), multi-document transactions (start/commit/abort), and retryable writes — including write retry when the primary steps down — on top of the SDAM core. Stacked on mongo-driver-core-improvements. Closes vibe-d#2850, vibe-d#2854, vibe-d#2855, vibe-d#2856
This was referenced Jun 17, 2026
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Hey @s-ludwig! This builds on the SDAM core PR (mongo-driver-core-improvements) and adds the transactional layer of the MongoDB 8 driver.
It introduces client session support (logical session IDs backed by a server session pool) and then layers multi-document transactions (start / commit / abort) and retryable writes on top, including automatic write retries when the primary steps down.
It's stacked on mongo-driver-core-improvements, so please review that one first; the diff here is just the sessions/transactions/retryable-writes layer.
Builds clean and all unit tests pass.
Closes #2850, #2854, #2855, #2856
merge after #2882
Thanks for taking a look!