diff --git a/ddl/ddl_tiflash_api.go b/ddl/ddl_tiflash_api.go
index 1ade909b93ee9..c601093ca5963 100644
--- a/ddl/ddl_tiflash_api.go
+++ b/ddl/ddl_tiflash_api.go
@@ -37,6 +37,7 @@ import (
 	"github.com/pingcap/tidb/store/helper"
 	"github.com/pingcap/tidb/table"
 	"github.com/pingcap/tidb/util"
+	"github.com/pingcap/tidb/util/intest"
 	"github.com/pingcap/tidb/util/logutil"
 	atomicutil "go.uber.org/atomic"
 	"go.uber.org/zap"
@@ -398,6 +399,13 @@ func pollAvailableTableProgress(schemas infoschema.InfoSchema, ctx sessionctx.Co
 				zap.Int64("tableID", availableTableID.ID),
 				zap.Bool("IsPartition", availableTableID.IsPartition),
 			)
+			if intest.InTest {
+				// In the test, the server cannot start up because the port is occupied.
+				// Although the port is random. so we need to quickly return when to
+				// fail to get tiflash sync.
+				// https://github.com/pingcap/tidb/issues/39949
+				panic(err)
+			}
 			continue
 		}
 		err = infosync.UpdateTiFlashProgressCache(availableTableID.ID, progress)
diff --git a/ddl/tiflashtest/BUILD.bazel b/ddl/tiflashtest/BUILD.bazel
index 2a803cf03c5af..4e24ea074d7f4 100644
--- a/ddl/tiflashtest/BUILD.bazel
+++ b/ddl/tiflashtest/BUILD.bazel
@@ -2,11 +2,13 @@ load("@io_bazel_rules_go//go:def.bzl", "go_test")
 
 go_test(
     name = "tiflashtest_test",
+    timeout = "short",
     srcs = [
         "ddl_tiflash_test.go",
         "main_test.go",
     ],
     flaky = True,
+    shard_count = 30,
     deps = [
         "//config",
         "//ddl",