bvandeusen and Claude Opus 5
86d6509936
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fix: a lane at zero slots tried to empty a pool billiard will not empty (4295)
...
Found on the operator's live deploy, not in CI:
[scheduler] worker_control: ml reconciled 1 -> 0 slots
[ml] pidbox command error:
ValueError("Can't shrink pool. All processes busy!")
ML ships at 0 stored slots and disabled, and `gen_supervisord` starts every
lane at one process so `add_consumer` has something to reach. So the stored
value and the running pool disagreed by one, permanently: billiard will not
remove the last worker, and `set_lane_slots_sync` returns True on SENDING the
control message — the refusal happens later, on the worker. The reconcile
logged a successful correction and reported `changed: ['ml']` every tick,
forever, on the default configuration of every install.
Lesson #4183 in production: an enforcer whose target is unreachable re-does
its own work on every pass and says it worked.
The floor is now one PROCESS, in one place — `effective_slots()` — applied
wherever a target is COMPARED as well as wherever one is sent. Comparing
against the unclamped 0 sees a difference no control message can ever close,
which is the same non-convergence one layer up.
Zero slots still means zero WORK: the lane's consumers are cancelled, and the
idle process is what the enable switch lands on.
A cross-file guard ties the generator's starting concurrency to the same
function, so the two ends of the floor cannot drift apart again.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com >
Claude-Session: https://claude.ai/code/session_01LVjrnpQjRgHdvq95rASoiR
2026-09-23 10:58:58 -04:00
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