diff --git a/components/bench/ycsb.go b/components/bench/ycsb.go
index 62292f3ace..2db1e11e5c 100644
--- a/components/bench/ycsb.go
+++ b/components/bench/ycsb.go
@@ -139,11 +139,11 @@ func registerYcsb(root *cobra.Command) {
 	cmd.PersistentFlags().Uint32Var(&config.ConnCount, "conncount", 128, "Connection Count")
 	cmd.PersistentFlags().BoolVar(&config.ReadAllFields, "readallfields", true, "Whether Read All Fields")
 
-	cmd.PersistentFlags().Float32Var(&config.ReadProportion, "readproportion", 0, "What proportion of operations are reads")
-	cmd.PersistentFlags().Float32Var(&config.UpdateProportion, "updateproportion", 0, "What proportion of operations are updates")
-	cmd.PersistentFlags().Float32Var(&config.ScanProportion, "scanproportion", 0, "What proportion of operations are scans")
-	cmd.PersistentFlags().Float32Var(&config.InsertProportion, "insertproportion", 0, "What proportion of operations are inserts")
-	cmd.PersistentFlags().Float32Var(&config.ReadModifyWriteProportion, "readmodifywriteproportion", 0, "What proportion of operations are read-modify-write")
+	cmd.PersistentFlags().Float32Var(&config.ReadProportion, "readproportion", 0.95, "What proportion of operations are reads, default 0.95")
+	cmd.PersistentFlags().Float32Var(&config.UpdateProportion, "updateproportion", 0.05, "What proportion of operations are updates, default 0.05")
+	cmd.PersistentFlags().Float32Var(&config.ScanProportion, "scanproportion", 0, "What proportion of operations are scans, default 0")
+	cmd.PersistentFlags().Float32Var(&config.InsertProportion, "insertproportion", 0, "What proportion of operations are inserts, default 0")
+	cmd.PersistentFlags().Float32Var(&config.ReadModifyWriteProportion, "readmodifywriteproportion", 0, "What proportion of operations are read-modify-write, default 0")
 
 	cmd.PersistentFlags().StringVar(&config.RequestDistribution, "requestdistribution", "uniform", "The distribution of requests across the keyspace, [zipfian, uniform, latest]")
 
diff --git a/pkg/cluster/spec/validate.go b/pkg/cluster/spec/validate.go
index 4c289d4674..32d4058ac3 100644
--- a/pkg/cluster/spec/validate.go
+++ b/pkg/cluster/spec/validate.go
@@ -624,6 +624,9 @@ func (s *Specification) portConflictsDetect() error {
 		"WebPort",
 		"TCPPort",
 		"HTTPPort",
+		"FlashServicePort",
+		"FlashProxyPort",
+		"FlashProxyStatusPort",
 		"ClusterPort",
 		"NgPort",
 	}
diff --git a/pkg/cluster/spec/validate_test.go b/pkg/cluster/spec/validate_test.go
index cc6b4db841..0355510467 100644
--- a/pkg/cluster/spec/validate_test.go
+++ b/pkg/cluster/spec/validate_test.go
@@ -129,6 +129,58 @@ tikv_servers:
 	c.Assert(err, NotNil)
 	c.Assert(err.Error(), Equals, "port conflict for '1234' between 'tidb_servers:172.16.5.138.port' and 'tikv_servers:172.16.5.138.status_port'")
 
+	topo = Specification{}
+	err = yaml.Unmarshal([]byte(`
+global:
+  user: "test1"
+  ssh_port: 220
+  deploy_dir: "test-deploy"
+  data_dir: "test-data"
+tiflash_servers:
+  - host: 172.16.5.138
+    tcp_port: 111
+    http_port: 222
+    flash_service_port: 1234
+    flash_proxy_port: 444
+    flash_proxy_status_port: 555
+    metrics_port: 666
+  - host: 172.16.5.138
+    tcp_port: 1111
+    http_port: 1222
+    flash_service_port: 1333
+    flash_proxy_port: 1444
+    flash_proxy_status_port: 1234
+    metrics_port: 1666
+`), &topo)
+	c.Assert(err, NotNil)
+	c.Assert(err.Error(), Equals, "port conflict for '1234' between 'tiflash_servers:172.16.5.138.flash_service_port' and 'tiflash_servers:172.16.5.138.flash_proxy_status_port'")
+
+	topo = Specification{}
+	err = yaml.Unmarshal([]byte(`
+global:
+  user: "test1"
+  ssh_port: 220
+  deploy_dir: "test-deploy"
+  data_dir: "test-data"
+tiflash_servers:
+  - host: 172.16.5.138
+    tcp_port: 111
+    http_port: 222
+    flash_service_port: 333
+    flash_proxy_port: 1234
+    flash_proxy_status_port: 555
+    metrics_port: 666
+  - host: 172.16.5.138
+    tcp_port: 1111
+    http_port: 1222
+    flash_service_port: 1333
+    flash_proxy_port: 1234
+    flash_proxy_status_port: 1555
+    metrics_port: 1666
+`), &topo)
+	c.Assert(err, NotNil)
+	c.Assert(err.Error(), Equals, "port conflict for '1234' between 'tiflash_servers:172.16.5.138.flash_proxy_port' and 'tiflash_servers:172.16.5.138.flash_proxy_port'")
+
 	topo = Specification{}
 	// tispark_masters has "omitempty" in its tag value
 	err = yaml.Unmarshal([]byte(`