xiangfu0 opened a new pull request, #17078:
URL: https://github.com/apache/pinot/pull/17078
This PR implements a runtime query throttling controller to keep servers
stable under load and improve UX.\n\nKey features:\n- Global concurrency gate
integrated with FCFS and Priority schedulers (pause/limit in-flight
queries).\n- Hooks into accounting levels: Alarm can optionally serialize
queries; Critical kills most expensive; Panic kills all (existing).\n- Dynamic
config updates: pinot.query.scheduler.throttling.* live-reload via accounting
watcher.\n- Admin API endpoints:\n - GET /throttling/state\n - POST
/throttling/setLimit { "_limit": N }\n\nConfig keys (under
pinot.query.scheduler.*):\n- throttling.pause_on_alarm=true|false\n-
throttling.alarm_max_concurrent=1\n-
throttling.normal_max_concurrent=<N>\n\nNotes:\n- Default concurrency derives
from query runner threads.\n- Heap-usage queue throttling remains available and
complementary.\n\nFollow-ups:\n- Add tests and docs for throttling behaviors
and admin API.,
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