// shouldQueueAgain is a helper function to determine whether the
// replica should be queued according to the current time, the last
// time the replica was processed, and the minimum interval between
// successive processing. Specifying minInterval=0 queues all replicas.
// Returns a bool for whether to queue as well as a priority based
// on how long it's been since last processed.
func shouldQueueAgain(now, last hlc.Timestamp, minInterval time.Duration) (bool, float64) {
if minInterval == 0 || last == hlc.ZeroTimestamp {
return true, 0
}
if diff := now.GoTime().Sub(last.GoTime()); diff >= minInterval {
priority := float64(1)
// If there's a non-zero last processed timestamp, adjust the
// priority by a multiple of how long it's been since the last
// time this replica was processed.
if last != hlc.ZeroTimestamp {
priority = float64(diff.Nanoseconds()) / float64(minInterval.Nanoseconds())
}
return true, priority
}
return false, 0
}
// selectEventTimestamp selects a timestamp for this log message. If the
// transaction this event is being written in has a non-zero timestamp, then that
// timestamp should be used; otherwise, the store's physical clock is used.
// This helps with testing; in normal usage, the logging of an event will never
// be the first action in the transaction, and thus the transaction will have an
// assigned database timestamp. However, in the case of our tests log events
// *are* the first action in a transaction, and we must elect to use the store's
// physical time instead.
func (ev EventLogger) selectEventTimestamp(input hlc.Timestamp) time.Time {
if input == hlc.ZeroTimestamp {
return ev.LeaseManager.clock.PhysicalTime()
}
return input.GoTime()
}
// selectEventTimestamp selects a timestamp for this log message. If the
// transaction this event is being written in has a non-zero timestamp, then that
// timestamp should be used; otherwise, the store's physical clock is used.
// This helps with testing; in normal usage, the logging of an event will never
// be the first action in the transaction, and thus the transaction will have an
// assigned database timestamp. However, in the case of our tests log events
// *are* the first action in a transaction, and we must elect to use the store's
// physical time instead.
func selectEventTimestamp(s *Store, input hlc.Timestamp) time.Time {
if input == hlc.ZeroTimestamp {
return s.Clock().PhysicalTime()
}
return input.GoTime()
}