Fixed delay longer than 10 seconds when near at block checkpoint.

miner/worker.go

@@ -54,6 +54,8 @@ const (
 	chainSideChanSize = 10
 	// timeout waiting for M1
 	waitPeriod = 10
+	// timeout for checkpoint.
+	waitPeriodCheckpoint = 60
 )
 
 // Agent can register themself with the worker
@@ -496,6 +498,11 @@ func (self *worker) commitNewWork() {
 				}
 				h := hop(len(masternodes), preIndex, curIndex)
 				gap := waitPeriod * int64(h)
+				// Check nearest checkpoint block in hop range.
+				nearest := self.config.XDPoA.Epoch - (parent.Header().Number.Uint64() % self.config.XDPoS.Epoch)
+				if uint64(h) >= nearest {
+				gap += waitPeriodCheckpoint
+				}
 				log.Info("Distance from the parent block", "seconds", gap, "hops", h)
 			L:
 				select {