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d2e64e85ce
Idle subscribers parked in the ResumeFromDiskError path were re-probing the in-memory buffer and disk every 250ms, emitting a "Notification timeout after ResumeFromDiskError, rechecking state" log line per tick even when nothing had changed. Once ReadFromDiskFn returns without advancing lastReadPosition, we know the disk has no data past the subscriber's current position. Switch to a 2s poll in that state so external disk writers (e.g. Schema Registry) are still re-detected on a bounded cadence, but idle CPU and log noise drop ~8x. Any progress (disk advance or notifyChan wakeup) clears the flag and restores the responsive 250ms tick for active readers. The per-timeout V(4) log is replaced by a single "Caught up to disk head" transition log.