log-backup: PITR do not support batch if skip requirement check (#39770…

…) (#39777)

close #39722

br/pkg/version/version.go

@@ -33,8 +33,9 @@ var (
 
 	versionHash = regexp.MustCompile("-[0-9]+-g[0-9a-f]{7,}")
 
-	checkpointSupportError  error = nil
-	pitrSupportBatchKVFiles bool  = true
+	checkpointSupportError error = nil
+	// pitrSupportBatchKVFiles specifies whether TiKV-server supports batch PITR.
+	pitrSupportBatchKVFiles bool = false
 )
 
 // NextMajorVersion returns the next major version.
@@ -140,6 +141,8 @@ func CheckVersionForBRPiTR(s *metapb.Store, tikvVersion *semver.Version) error {
 	// If tikv version < 6.5, PITR do not support restoring batch kv files.
 	if tikvVersion.Major < 6 || (tikvVersion.Major == 6 && tikvVersion.Minor < 5) {
 		pitrSupportBatchKVFiles = false
+	} else {
+		pitrSupportBatchKVFiles = true
 	}
 
 	// The versions of BR and TiKV should be the same when use BR 6.1.0

br/pkg/version/version_test.go

@@ -76,6 +76,15 @@ func TestCheckClusterVersion(t *testing.T) {
 		require.Regexp(t, `^TiKV .* version mismatch when use PiTR v6.2.0\+, please `, err.Error())
 	}
 
+	{
+		// Default value of `pitrSupportBatchKVFiles` should be `false`.
+		build.ReleaseVersion = "v6.5.0"
+		mock.getAllStores = func() []*metapb.Store {
+			return []*metapb.Store{{Version: `v6.2.0`}}
+		}
+		require.Equal(t, CheckPITRSupportBatchKVFiles(), false)
+	}
+
 	{
 		build.ReleaseVersion = "v6.2.0"
 		mock.getAllStores = func() []*metapb.Store {