Once the signals daemon had run its first settings check, it called
ServerRepository::getAll(true) - a SELECT * FROM servers against MAIN - on
every pass of a loop that sleeps 250 ms: up to 240 reads a minute from every
node. The watchdog and the cache handler tied the reload to the settings
interval instead (10-60 s), so their view of the cluster could be a minute
stale.
DaemonTrait::serversRefreshDue()/refreshServers() reload at most every five
seconds, and the three daemons use it: 12 reads a minute, never more than
five seconds stale (SignalsLoopQueryRateTest). Phase 0 of the MAIN <-> LB
API plan.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Es8UhyPS8MNjuYTagqfGWi
