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Don't cut-over until it is safe to do so

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This commit is contained in:
Cathal Coffey 2021-01-31 18:28:25 +00:00
parent a4218cd6f4
commit 8a26c9ebf4
1 changed files with 16 additions and 0 deletions
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16
go/logic/migrator.go
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@ -518,6 +518,22 @@ func (this *Migrator) cutOver() (err error) {
this.migrationContext.MarkPointOfInterest()
this.migrationContext.Log.Debugf("checking for cut-over postpone: complete")
this.migrationContext.Log.Infof("Waiting for heartbeat lag to be low enough to proceed")
this.sleepWhileTrue(
func() (bool, error) {
currentHeartbeatLag := atomic.LoadInt64(&this.migrationContext.CurrentHeartbeatLag)
maxLagMillisecondsThrottleThreshold := atomic.LoadInt64(&this.migrationContext.MaxLagMillisecondsThrottleThreshold)
if time.Duration(currentHeartbeatLag) > time.Duration(maxLagMillisecondsThrottleThreshold)*time.Millisecond {
this.migrationContext.Log.Infof("current HeartbeatLag (%.2fs) is too high, it needs to be less than --max-lag-millis (%.2fs) to continue", time.Duration(currentHeartbeatLag).Seconds(), (time.Duration(maxLagMillisecondsThrottleThreshold) * time.Millisecond).Seconds())
return true, nil
} else {
return false, nil
}
},
)
this.migrationContext.MarkPointOfInterest()
this.migrationContext.Log.Infof("Heartbeat lag is low enough, proceeding")
if this.migrationContext.TestOnReplica {
// With `--test-on-replica` we stop replication thread, and then proceed to use
// the same cut-over phase as the master would use. That means we take locks