From ddad61a8839920dcbc0d2c2236b73111ebef6ccd Mon Sep 17 00:00:00 2001
From: Jun Wang <jun.wang@demonware.net>
Date: Tue, 28 Nov 2023 14:41:48 -0800
Subject: [PATCH] update func GetBackupCandidates

Signed-off-by: Jun Wang <jun.wang@demonware.net>
---
 go/vt/vtctl/reparentutil/util.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/go/vt/vtctl/reparentutil/util.go b/go/vt/vtctl/reparentutil/util.go
index 2f6f846e793..0dca8627e3b 100644
--- a/go/vt/vtctl/reparentutil/util.go
+++ b/go/vt/vtctl/reparentutil/util.go
@@ -346,6 +346,16 @@ func waitForCatchUp(
 
 // GetBackupCandidates is used to get a list of healthy tablets for backup
 func GetBackupCandidates(tablets []*topo.TabletInfo, stats []*replicationdatapb.Status) (res []*topo.TabletInfo) {
+	// In case of all tablets has nil stats, return TabletType_PRIMARY
+	if len(stats) == 0 {
+		for _, tablet := range tablets {
+			if tablet.Type == topodatapb.TabletType_PRIMARY {
+				res = append(res, tablet)
+				break
+			}
+		}
+		return res
+	}
 	for i, stat := range stats {
 		// Always include TabletType_PRIMARY
 		if tablets[i].Type == topodatapb.TabletType_PRIMARY {