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Nick Yuan fab97463c2 Fix unbounded growth of Broker.set_stat cluster master list (#322)
Prune stale entries from the master list on new cluster registration
and only write the list when membership changes (with timeout=None).

Before this fix, set_stat was append-only — dead cluster keys accumulated
forever because the only cleanup path (get_stats) runs only from the
monitor UIs. On DatabaseCache backends this rewrote the growing pickled
list to Postgres on every heartbeat, producing measurable egress.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-14 00:24:43 +02:00
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