diff --git a/go.mod b/go.mod
index cae45b8107..5b8473bc5d 100644
--- a/go.mod
+++ b/go.mod
@@ -24,7 +24,7 @@ require (
 	github.com/pingcap/log v0.0.0-20210317133921-96f4fcab92a4
 	github.com/pingcap/parser v0.0.0-20210415081931-48e7f467fd74
 	github.com/pingcap/tidb v1.1.0-beta.0.20210330094614-60111e1c4b6f
-	github.com/pingcap/tidb-tools v5.1.0-alpha.0.20210603090026-288ab02f1c79+incompatible
+	github.com/pingcap/tidb-tools v5.2.0-alpha.0.20210721090336-4921149b5e5c+incompatible
 	github.com/prometheus/client_golang v1.5.1
 	github.com/rakyll/statik v0.1.6
 	github.com/shopspring/decimal v0.0.0-20200105231215-408a2507e114
diff --git a/go.sum b/go.sum
index a82ebd7872..8c8bcabdc7 100644
--- a/go.sum
+++ b/go.sum
@@ -847,8 +847,8 @@ github.com/pingcap/tidb-tools v4.0.1+incompatible/go.mod h1:XGdcy9+yqlDSEMTpOXnw
 github.com/pingcap/tidb-tools v4.0.5-0.20200820082341-afeaaaaaa153+incompatible/go.mod h1:XGdcy9+yqlDSEMTpOXnwf3hiTeqrV6MN/u1se9N8yIM=
 github.com/pingcap/tidb-tools v4.0.5-0.20200820092506-34ea90c93237+incompatible/go.mod h1:XGdcy9+yqlDSEMTpOXnwf3hiTeqrV6MN/u1se9N8yIM=
 github.com/pingcap/tidb-tools v4.0.9-0.20201127090955-2707c97b3853+incompatible/go.mod h1:XGdcy9+yqlDSEMTpOXnwf3hiTeqrV6MN/u1se9N8yIM=
-github.com/pingcap/tidb-tools v5.1.0-alpha.0.20210603090026-288ab02f1c79+incompatible h1:yCmJpDxoxm7kU+K5ORfLmzwLwJ16CdIYoJtP7INyN4w=
-github.com/pingcap/tidb-tools v5.1.0-alpha.0.20210603090026-288ab02f1c79+incompatible/go.mod h1:XGdcy9+yqlDSEMTpOXnwf3hiTeqrV6MN/u1se9N8yIM=
+github.com/pingcap/tidb-tools v5.2.0-alpha.0.20210721090336-4921149b5e5c+incompatible h1:znpzvqvoak2c+cCw+O70Nrn/VnNJxXDbNWE8UqG+t54=
+github.com/pingcap/tidb-tools v5.2.0-alpha.0.20210721090336-4921149b5e5c+incompatible/go.mod h1:XGdcy9+yqlDSEMTpOXnwf3hiTeqrV6MN/u1se9N8yIM=
 github.com/pingcap/tipb v0.0.0-20190428032612-535e1abaa330/go.mod h1:RtkHW8WbcNxj8lsbzjaILci01CtYnYbIkQhjyZWrWVI=
 github.com/pingcap/tipb v0.0.0-20200417094153-7316d94df1ee/go.mod h1:RtkHW8WbcNxj8lsbzjaILci01CtYnYbIkQhjyZWrWVI=
 github.com/pingcap/tipb v0.0.0-20200604070248-508f03b0b342/go.mod h1:RtkHW8WbcNxj8lsbzjaILci01CtYnYbIkQhjyZWrWVI=
diff --git a/syncer/dbconn/db.go b/syncer/dbconn/db.go
index 5e7e6c39f3..f79a667e29 100644
--- a/syncer/dbconn/db.go
+++ b/syncer/dbconn/db.go
@@ -160,6 +160,8 @@ func (conn *DBConn) ExecuteSQLWithIgnore(tctx *tcontext.Context, ignoreError fun
 						log.ShortError(err))
 					return false
 				}
+				tctx.L().Warn("execute sql failed by connection error", zap.Int("retry", retryTime),
+					zap.Error(err))
 				metrics.SQLRetriesTotal.WithLabelValues("stmt_exec", conn.Cfg.Name).Add(1)
 				return true
 			}
@@ -168,6 +170,8 @@ func (conn *DBConn) ExecuteSQLWithIgnore(tctx *tcontext.Context, ignoreError fun
 					zap.String("queries", utils.TruncateInterface(queries, -1)),
 					zap.String("arguments", utils.TruncateInterface(args, -1)),
 					log.ShortError(err))
+				tctx.L().Warn("execute sql failed by retryable error", zap.Int("retry", retryTime),
+					zap.Error(err))
 				metrics.SQLRetriesTotal.WithLabelValues("stmt_exec", conn.Cfg.Name).Add(1)
 				return true
 			}