From 761b5926a73d15ef165f525fdada5a0f7fa3e221 Mon Sep 17 00:00:00 2001
From: glorv <glorvs@163.com>
Date: Thu, 27 Jun 2024 13:02:52 +0800
Subject: [PATCH] session: reserve bootstrap versions for v8.1.x (#54266)

ref pingcap/tidb#53440, close pingcap/tidb#54267
---
 .../restore/snap_client/systable_restore_test.go |  2 +-
 pkg/session/bootstrap.go                         | 16 ++++++++++------
 pkg/session/bootstrap_test.go                    |  6 +++---
 3 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/br/pkg/restore/snap_client/systable_restore_test.go b/br/pkg/restore/snap_client/systable_restore_test.go
index 79ef433ea7399..8fe64402f33c2 100644
--- a/br/pkg/restore/snap_client/systable_restore_test.go
+++ b/br/pkg/restore/snap_client/systable_restore_test.go
@@ -115,5 +115,5 @@ func TestCheckSysTableCompatibility(t *testing.T) {
 //
 // The above variables are in the file br/pkg/restore/systable_restore.go
 func TestMonitorTheSystemTableIncremental(t *testing.T) {
-	require.Equal(t, int64(199), session.CurrentBootstrapVersion)
+	require.Equal(t, int64(209), session.CurrentBootstrapVersion)
 }
diff --git a/pkg/session/bootstrap.go b/pkg/session/bootstrap.go
index ce7731c02ddd2..9e50364fd1814 100644
--- a/pkg/session/bootstrap.go
+++ b/pkg/session/bootstrap.go
@@ -1098,14 +1098,18 @@ const (
 	//   add column `owner_id` for `mysql.tidb_mdl_info` table
 	version198 = 198
 
-	// version 199
+	// ...
+	// [version199, version208] is the version range reserved for patches of 8.1.x
+	// ...
+
+	// version 209
 	//   sets `tidb_resource_control_strict_mode` to off when a cluster upgrades from some version lower than v8.2.
-	version199 = 199
+	version209 = 209
 )
 
 // currentBootstrapVersion is defined as a variable, so we can modify its value for testing.
 // please make sure this is the largest version
-var currentBootstrapVersion int64 = version199
+var currentBootstrapVersion int64 = version209
 
 // DDL owner key's expired time is ManagerSessionTTL seconds, we should wait the time and give more time to have a chance to finish it.
 var internalSQLTimeout = owner.ManagerSessionTTL + 15
@@ -1269,7 +1273,7 @@ var (
 		upgradeToVer196,
 		upgradeToVer197,
 		upgradeToVer198,
-		upgradeToVer199,
+		upgradeToVer209,
 	}
 )
 
@@ -3038,8 +3042,8 @@ func upgradeToVer198(s sessiontypes.Session, ver int64) {
 	doReentrantDDL(s, "ALTER TABLE mysql.tidb_mdl_info ADD COLUMN owner_id VARCHAR(64) NOT NULL DEFAULT '';", infoschema.ErrColumnExists)
 }
 
-func upgradeToVer199(s sessiontypes.Session, ver int64) {
-	if ver >= version199 {
+func upgradeToVer209(s sessiontypes.Session, ver int64) {
+	if ver >= version209 {
 		return
 	}
 
diff --git a/pkg/session/bootstrap_test.go b/pkg/session/bootstrap_test.go
index f39eefc6545ba..c617f8b83a1d1 100644
--- a/pkg/session/bootstrap_test.go
+++ b/pkg/session/bootstrap_test.go
@@ -2249,12 +2249,12 @@ func testTiDBUpgradeWithDistTask(t *testing.T, injectQuery string, fatal bool) {
 	require.Equal(t, fatal, fatal2panic)
 }
 
-func TestTiDBUpgradeToVer199(t *testing.T) {
+func TestTiDBUpgradeToVer209(t *testing.T) {
 	ctx := context.Background()
 	store, _ := CreateStoreAndBootstrap(t)
 	defer func() { require.NoError(t, store.Close()) }()
 
-	// bootstrap as version198
+	// bootstrap as version198, version 199~208 is reserved for v8.1.x bugfix patch.
 	ver198 := version198
 	seV198 := CreateSessionAndSetID(t, store)
 	txn, err := store.Begin()
@@ -2269,7 +2269,7 @@ func TestTiDBUpgradeToVer199(t *testing.T) {
 	require.NoError(t, err)
 	unsetStoreBootstrapped(store.UUID())
 
-	// upgrade to ver199
+	// upgrade to ver209
 	domCurVer, err := BootstrapSession(store)
 	require.NoError(t, err)
 	defer domCurVer.Close()