fix(sessions): preserve concurrent writes during compaction - #4736
fix(sessions): preserve concurrent writes during compaction#4736seratch wants to merge 1 commit into
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Co-authored-by: Om Singhal <wengsinghal@gmail.com>
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This pull request fixes #4679 by serializing
OpenAIResponsesCompactionSessionmutations across the fullresponses.compactrequest and replacement window.Before this change,
run_compactionreleased its mutation lock while awaitingresponses.compact, so a same-wrapperadd_itemscould be overwritten by the later clear-and-replace, and a concurrentclear_sessioncould be undone. The compaction lock now remains held from the history snapshot through replacement, so queued mutations run afterward and determine the final Session state.The regression tests use deterministic event ordering to verify that a queued append survives after compacted output and that a queued clear leaves the Session empty. This change intentionally does not add backend-wide coordination for separate compaction wrapper instances because the released
Sessionprotocol does not expose a shared revision or compare-and-swap boundary.This pull request resolves #4679.