br: add retry for raw kv client put

br/pkg/restore/log_client/BUILD.bazel

@@ -101,6 +101,7 @@ go_test(
         "//br/pkg/mock",
         "//br/pkg/restore",
         "//br/pkg/restore/internal/import_client",
+        "//br/pkg/restore/internal/rawkv",
         "//br/pkg/restore/split",
         "//br/pkg/restore/utils",
         "//br/pkg/storage",
@@ -132,6 +133,7 @@ go_test(
         "@com_github_pingcap_kvproto//pkg/metapb",
         "@com_github_pingcap_log//:log",
         "@com_github_stretchr_testify//require",
+        "@com_github_tikv_client_go_v2//rawkv",
         "@org_golang_google_grpc//codes",
         "@org_golang_google_grpc//keepalive",
         "@org_golang_google_grpc//status",

br/pkg/restore/log_client/client.go

@@ -1493,7 +1493,7 @@ func (rc *LogClient) restoreMetaKvEntries(
 		failpoint.Inject("failed-to-restore-metakv", func(_ failpoint.Value) {
 			failpoint.Return(0, 0, errors.Errorf("failpoint: failed to restore metakv"))
 		})
-		if err := rc.rawKVClient.Put(ctx, newEntry.Key, newEntry.Value, entry.Ts); err != nil {
+		if err := PutRawKvWithRetry(ctx, rc.rawKVClient, newEntry.Key, newEntry.Value, entry.Ts); err != nil {
 			return 0, 0, errors.Trace(err)
 		}
 		// for failpoint, we need to flush the cache in rawKVClient every time
@@ -2053,3 +2053,13 @@ func (rc *LogClient) FailpointDoChecksumForLogRestore(
 
 	return eg.Wait()
 }
+
+func PutRawKvWithRetry(ctx context.Context, client *rawkv.RawKVBatchClient, key, value []byte, originTs uint64) error {
+	err := utils.WithRetry(ctx, func() error {
+		return client.Put(ctx, key, value, originTs)
+	}, utils.NewRawClientBackoffStrategy())
+	if err != nil {
+		return errors.Errorf("failed to put raw kv after retry")
+	}
+	return nil
+}

br/pkg/restore/log_client/client_test.go

@@ -31,6 +31,7 @@ import (
 	"github.com/pingcap/tidb/br/pkg/gluetidb"
 	"github.com/pingcap/tidb/br/pkg/mock"
 	"github.com/pingcap/tidb/br/pkg/restore"
+	rawclient "github.com/pingcap/tidb/br/pkg/restore/internal/rawkv"
 	logclient "github.com/pingcap/tidb/br/pkg/restore/log_client"
 	"github.com/pingcap/tidb/br/pkg/restore/split"
 	"github.com/pingcap/tidb/br/pkg/restore/utils"
@@ -49,6 +50,7 @@ import (
 	"github.com/pingcap/tidb/pkg/util/sqlexec"
 	filter "github.com/pingcap/tidb/pkg/util/table-filter"
 	"github.com/stretchr/testify/require"
+	"github.com/tikv/client-go/v2/rawkv"
 	"google.golang.org/grpc/keepalive"
 )
 
@@ -1986,3 +1988,69 @@ func fakeRowKey(tableID, rowID int64) kv.Key {
 func fakeRowRawKey(tableID, rowID int64) kv.Key {
 	return tablecodec.EncodeRecordKey(tablecodec.GenTableRecordPrefix(tableID), kv.IntHandle(rowID))
 }
+
+type mockRawKVClient struct {
+	rawkv.Client
+	putCount     int
+	errThreshold int
+}
+
+func (m *mockRawKVClient) BatchPut(ctx context.Context, keys, values [][]byte, options ...rawkv.RawOption) error {
+	m.putCount += 1
+	if m.errThreshold >= m.putCount {
+		return errors.New("rpcClient is idle")
+	}
+	return nil
+}
+
+func TestPutRawKvWithRetry(t *testing.T) {
+	tests := []struct {
+		name         string
+		errThreshold int
+		cancelAfter  time.Duration
+		wantErr      string
+		wantPuts     int
+	}{
+		{
+			name:         "success on first try",
+			errThreshold: 0,
+			wantPuts:     1,
+		},
+		{
+			name:         "success on after failure",
+			errThreshold: 2,
+			wantPuts:     3,
+		},
+		{
+			name:         "fails all retries",
+			errThreshold: 5,
+			wantErr:      "failed to put raw kv after retry",
+			wantPuts:     5,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			mockRawClient := &mockRawKVClient{
+				errThreshold: tt.errThreshold,
+			}
+			client := rawclient.NewRawKVBatchClient(mockRawClient, 1)
+
+			ctx := context.Background()
+			if tt.cancelAfter > 0 {
+				var cancel context.CancelFunc
+				ctx, cancel = context.WithTimeout(ctx, tt.cancelAfter)
+				defer cancel()
+			}
+
+			err := logclient.PutRawKvWithRetry(ctx, client, []byte("key"), []byte("value"), 1)
+
+			if tt.wantErr != "" {
+				require.ErrorContains(t, err, tt.wantErr)
+			} else {
+				require.NoError(t, err)
+			}
+			require.Equal(t, tt.wantPuts, mockRawClient.putCount)
+		})
+	}
+}

br/pkg/utils/backoff.go

@@ -53,6 +53,10 @@ const (
 	recoveryMaxAttempts  = 16
 	recoveryDelayTime    = 30 * time.Second
 	recoveryMaxDelayTime = 4 * time.Minute
+
+	rawClientMaxAttempts  = 5
+	rawClientDelayTime    = 500 * time.Millisecond
+	rawClientMaxDelayTime = 5 * time.Second
 )
 
 // BackoffStrategy implements a backoff strategy for retry operations.
@@ -379,6 +383,17 @@ func NewChecksumBackoffStrategy() BackoffStrategy {
 	)
 }
 
+func NewRawClientBackoffStrategy() BackoffStrategy {
+	return NewBackoffStrategy(
+		WithRemainingAttempts(rawClientMaxAttempts),
+		WithDelayTime(rawClientDelayTime),
+		WithMaxDelayTime(rawClientMaxDelayTime),
+		WithErrorContext(NewZeroRetryContext("raw client")),
+		WithRetryErrorFunc(alwaysTrueFunc()),
+		WithNonRetryErrorFunc(alwaysFalseFunc()),
+	)
+}
+
 func (bo *backoffStrategyImpl) NextBackoff(err error) time.Duration {
 	errs := multierr.Errors(err)
 	lastErr := errs[len(errs)-1]