rollout: add ordinals to rollout JSONL lines#31859
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Ported to https://github.com/openai/codex-internal/pull/1376. Continuing review and merge there per the codex-internal repository migration. |
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Description
This PR adds an optional integer
ordinalto each rollout JSONL line and emits them only forthread.history_mode = 'paginated'threads. Since we haven't started writing any yet, we can guarantee that all paginated threads are new rollouts and can start with ordinal 0. We don't have to deal with populating 0 in the middle of a rollout.For legacy rollouts, we don't write ordinals and leave it as
ordinal: None.Why
Ordinals give paginated rollout records a durable ordering position for later projection and thread forking optimizations. Having a monotonically increasing integer for an append-only log just makes a lot of sense and makes things downstream easier.