From b169948d9e44c69f8ad6e3b4aaeab01311dd22d5 Mon Sep 17 00:00:00 2001
From: Evgeniy <moytlf@gmail.com>
Date: Thu, 28 Dec 2023 16:54:05 +0300
Subject: [PATCH] bug fix

---
 internal/app/replication.go | 39 +++++++++++++++++++++++++++++--------
 1 file changed, 31 insertions(+), 8 deletions(-)

diff --git a/internal/app/replication.go b/internal/app/replication.go
index 70d2fa4b..89f0e76b 100644
--- a/internal/app/replication.go
+++ b/internal/app/replication.go
@@ -17,8 +17,9 @@ const (
 )
 
 type ReplicationRepairState struct {
-	LastAttempt time.Time
-	History     map[ReplicationRepairAlgorithmType]int
+	LastAttempt      time.Time
+	History          map[ReplicationRepairAlgorithmType]int
+	BeforeRepairGTID *mysql.GTIDExecuted
 }
 
 func (app *App) MarkReplicationRunning(node *mysql.Node, channel string) {
@@ -30,13 +31,22 @@ func (app *App) MarkReplicationRunning(node *mysql.Node, channel string) {
 		return
 	}
 
-	if replState.cooldownPassed(app.config.ReplicationRepairCooldown) {
+	gtid, err := node.GTIDExecuted()
+	if err != nil {
+		return
+	}
+	if replState.cooldownPassed(app.config.ReplicationRepairCooldown) &&
+		replState.isGtidExecuted(gtid) {
 		delete(app.replRepairState, key)
 	}
 }
 
 func (app *App) TryRepairReplication(node *mysql.Node, master string, channel string) {
-	replState := app.getOrCreateHostRepairState(app.makeReplStateKey(node, channel))
+	replState, err := app.getOrCreateHostRepairState(app.makeReplStateKey(node, channel), node.Host())
+	if err != nil {
+		app.logger.Errorf("repair error: host %s, %v", node.Host(), err)
+		return
+	}
 
 	if !replState.cooldownPassed(app.config.ReplicationRepairCooldown) {
 		return
@@ -138,22 +148,35 @@ func (state *ReplicationRepairState) cooldownPassed(replicationRepairCooldown ti
 	return state.LastAttempt.Before(cooldown)
 }
 
-func (app *App) getOrCreateHostRepairState(stateKey string) *ReplicationRepairState {
+func (state *ReplicationRepairState) isGtidExecuted(currentGtid *mysql.GTIDExecuted) bool {
+	if state.BeforeRepairGTID.ExecutedGtidSet == currentGtid.ExecutedGtidSet {
+		return false
+	}
+	return true
+}
+
+func (app *App) getOrCreateHostRepairState(stateKey, hostname string) (*ReplicationRepairState, error) {
 	var replState *ReplicationRepairState
 	if state, ok := app.replRepairState[stateKey]; ok {
 		replState = state
 	} else {
 		replState = app.createRepairState()
+		executedGtid, err := app.cluster.Get(hostname).GTIDExecuted()
+		if err != nil {
+			return nil, err
+		}
+		replState.BeforeRepairGTID = executedGtid
 		app.replRepairState[stateKey] = replState
 	}
 
-	return replState
+	return replState, nil
 }
 
 func (app *App) createRepairState() *ReplicationRepairState {
 	result := ReplicationRepairState{
-		LastAttempt: time.Now(),
-		History:     make(map[ReplicationRepairAlgorithmType]int),
+		LastAttempt:      time.Now(),
+		History:          make(map[ReplicationRepairAlgorithmType]int),
+		BeforeRepairGTID: &mysql.GTIDExecuted{},
 	}
 
 	for i := range app.getAlgorithmOrder() {