[DataFlow runtime · M5 2/4] Control-plane backpressure (watermarks, caps, starvation)#607
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…tion) BackpressureController is pure policy: it reads data-plane capacity through a narrow CapacityReporter (FeatureStore.health, ints only) and decides when the controller pauses prompt leasing. The store reports capacity; the controller decides scheduling (ownership per control_plane/backpressure.md). - high/low byte watermarks with a latched hysteresis band (no flapping) - per-rollout-worker in-flight prompt cap; per-call trainer-lease cap - rollout-starvation vs trainer-starvation counted separately - DataFlowController.status() now exposes train_backlog + backpressure snapshot - default (no policy) preserves exact M1-M4 lease behavior Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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jiapingW
approved these changes
Jun 29, 2026
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Adds BackpressureController (hysteresis high/low watermarks, per-worker inflight caps, train-lease caps, separate rollout/trainer starvation) wired optionally into DataFlowController.
Part of the DataFlow runtime M5/M6 stacked series (continues the M1–M4 work in #594–#601 / #603). Stacked PRs — merge bottom-up (up-9 first). Lint (pre-commit) + runtime CPU test suite green.
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