Merge pull request radondb#180 from acekingke/fix_bug

api,cluster: fix the bug for status reset leader radondb#178

cluster/syncer/statefulset.go

@@ -258,6 +258,11 @@ func (s *StatefulSetSyncer) preUpdate(ctx context.Context, leader, follower stri
 		return nil
 	}
 
+	// Touch a new preUpdate file ,indicate that preUpdate is going on
+	// remove it when it is finished.
+	// See https://github.com/radondb/radondb-mysql-kubernetes/issues/178
+	utils.TouchUpdateFile()
+	defer utils.RemoveUpdateFile()
 	sctName := s.GetNameForResource(utils.Secret)
 	svcName := s.GetNameForResource(utils.HeadlessSVC)
 	port := utils.MysqlPort

cluster/syncer/status.go

@@ -204,7 +204,9 @@ func (s *StatusSyncer) updateNodeStatus(ctx context.Context, cli client.Client,
 				node.Message = err.Error()
 			}
 
-			if isLeader == corev1.ConditionTrue && isReadOnly != corev1.ConditionFalse {
+			if !utils.ExistUpdateFile() &&
+				isLeader == corev1.ConditionTrue &&
+				isReadOnly != corev1.ConditionFalse {
 				log.V(1).Info("try to correct the leader writeable", "node", node.Name)
 				runner.RunQuery("SET GLOBAL read_only=off")
 				runner.RunQuery("SET GLOBAL super_read_only=off")

utils/common.go

@@ -18,6 +18,7 @@ package utils
 
 import (
 	"fmt"
+	"os"
 	"sort"
 	"strconv"
 	"strings"
@@ -58,3 +59,34 @@ func GetOrdinal(name string) (int, error) {
 	}
 	return ordinal, nil
 }
+
+// Create the Update file.
+func TouchUpdateFile() error {
+	var err error
+	var file *os.File
+
+	if file, err = os.Create(FileIndicateUpdate); err != nil {
+		return err
+	}
+
+	file.Close()
+	return nil
+}
+
+// Remove the Update file.
+func RemoveUpdateFile() error {
+	return os.Remove(FileIndicateUpdate)
+}
+
+// Check update file exist.
+func ExistUpdateFile() bool {
+	f, err := os.Open(FileIndicateUpdate)
+	if os.IsNotExist(err) {
+		return false
+	} else if err != nil {
+		return true
+	}
+
+	err = f.Close()
+	return true
+}

utils/constants.go

@@ -86,6 +86,9 @@ const (
 	// The path to the client MySQL client configuration.
 	// The file used to liveness and readiness check.
 	ConfClientPath = "/etc/mysql/client.conf"
+
+	// preUpdate file
+	FileIndicateUpdate = "PreUpdating"
 )
 
 // ResourceName is the type for aliasing resources that will be created.