diff --git a/cluster/loadbalance/least_active.go b/cluster/loadbalance/least_active.go
index 39c5620f02d607bb68430e17a206a1649ee31c54..aa69f3cc207ae7465bc6d5472bc075d0902c8978 100644
--- a/cluster/loadbalance/least_active.go
+++ b/cluster/loadbalance/least_active.go
@@ -15,7 +15,6 @@
  * limitations under the License.
  */
 
-// @author yiji@apache.org
 package loadbalance
 
 import (
diff --git a/cluster/loadbalance/round_robin_test.go b/cluster/loadbalance/round_robin_test.go
index e261884b55971d95ccfbfdc34e32a07dc256fcca..0b8e89c7349afb056309b5a70d91aa5cce309aa0 100644
--- a/cluster/loadbalance/round_robin_test.go
+++ b/cluster/loadbalance/round_robin_test.go
@@ -1,3 +1,20 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package loadbalance
 
 import (
diff --git a/common/extension/router_factory.go b/common/extension/router_factory.go
index f364292b07850d1ef48f008eeb12261bf4b274a5..6f27aafaebf87147116e74272cc229657f436201 100644
--- a/common/extension/router_factory.go
+++ b/common/extension/router_factory.go
@@ -1,3 +1,20 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package extension
 
 import (
diff --git a/config_center/configuration_parser.go b/config_center/configuration_parser.go
index ab02789c9267786c900b57c312b1346ee2653fde..95b122e1e790c5bd8e01988282eae517a431463a 100644
--- a/config_center/configuration_parser.go
+++ b/config_center/configuration_parser.go
@@ -1,8 +1,26 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package config_center
 
 import (
 	"github.com/magiconair/properties"
 )
+
 import (
 	"github.com/apache/dubbo-go/common/logger"
 )
diff --git a/config_center/configuration_parser_test.go b/config_center/configuration_parser_test.go
index 3c84fd70b03df06184365e132a174dfc640da1c2..4a67d423040c768475ab16f1d4a0c22bc64e4f0d 100644
--- a/config_center/configuration_parser_test.go
+++ b/config_center/configuration_parser_test.go
@@ -1,8 +1,26 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package config_center
 
 import (
 	"testing"
 )
+
 import (
 	"github.com/stretchr/testify/assert"
 )
diff --git a/filter/impl/active_filter.go b/filter/impl/active_filter.go
index d7dad74cf3f5ccadf39372335bc1efb22f497523..36a4e1a767ab7170ce8e5bebf2cfa4403f6ad4ff 100644
--- a/filter/impl/active_filter.go
+++ b/filter/impl/active_filter.go
@@ -15,7 +15,6 @@
  * limitations under the License.
  */
 
-// @author yiji@apache.org
 package impl
 
 import (
diff --git a/protocol/dubbo/pool.go b/protocol/dubbo/pool.go
index cdd2a10a471dd906fc77d165991752cc7d7e266b..d619a2f8fe78524b3d704cb9de280ebbf534eb12 100644
--- a/protocol/dubbo/pool.go
+++ b/protocol/dubbo/pool.go
@@ -39,7 +39,7 @@ type gettyRPCClient struct {
 	once     sync.Once
 	protocol string
 	addr     string
-	created  int64 // zero, not create or be destroyed
+	active   int64 // zero, not create or be destroyed
 
 	pool *gettyRPCClientPool
 
@@ -85,11 +85,11 @@ func newGettyRPCClientConn(pool *gettyRPCClientPool, protocol, addr string) (*ge
 }
 
 func (c *gettyRPCClient) updateActive(active int64) {
-	atomic.StoreInt64(&c.created, active)
+	atomic.StoreInt64(&c.active, active)
 }
 
 func (c *gettyRPCClient) getActive() int64 {
-	return atomic.LoadInt64(&c.created)
+	return atomic.LoadInt64(&c.active)
 }
 
 func (c *gettyRPCClient) newSession(session getty.Session) error {
@@ -154,6 +154,9 @@ func (c *gettyRPCClient) addSession(session getty.Session) {
 	}
 
 	c.lock.Lock()
+	if c.sessions == nil {
+		c.sessions = make([]*rpcSession, 0, 16)
+	}
 	c.sessions = append(c.sessions, &rpcSession{session: session})
 	c.lock.Unlock()
 }
@@ -271,7 +274,7 @@ func newGettyRPCClientConnPool(rpcClient *Client, size int, ttl time.Duration) *
 		rpcClient: rpcClient,
 		size:      size,
 		ttl:       int64(ttl.Seconds()),
-		conns:     []*gettyRPCClient{},
+		conns:     make([]*gettyRPCClient, 0, 16),
 	}
 }
 
@@ -300,12 +303,11 @@ func (p *gettyRPCClientPool) getGettyRpcClient(protocol, addr string) (*gettyRPC
 		p.conns = p.conns[:len(p.conns)-1]
 
 		if d := now - conn.getActive(); d > p.ttl {
-			if closeErr := conn.safeClose(); closeErr == nil {
-				p.remove(conn)
-			}
+			p.remove(conn)
+			conn.safeClose()
 			continue
 		}
-		conn.updateActive(now) //update created time
+		conn.updateActive(now) //update active time
 
 		return conn, nil
 	}
@@ -331,10 +333,9 @@ func (p *gettyRPCClientPool) release(conn *gettyRPCClient, err error) {
 	}
 
 	if len(p.conns) >= p.size {
-		if closeErr := conn.safeClose(); closeErr == nil {
-			// delete @conn from client pool
-			p.remove(conn)
-		}
+		// delete @conn from client pool
+		p.remove(conn)
+		conn.safeClose()
 		return
 	}
 	p.conns = append(p.conns, conn)
diff --git a/registry/zookeeper/listener_test.go b/registry/zookeeper/listener_test.go
index 7ebc32b8a50bcb38d5ac859e4216065559fbd4e5..9d9cebefcba0ab18e0e991a9cbd114af1aec6587 100644
--- a/registry/zookeeper/listener_test.go
+++ b/registry/zookeeper/listener_test.go
@@ -1,11 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package zookeeper
 
 import (
 	"context"
+	"testing"
+)
+
+import (
 	"github.com/apache/dubbo-go/common"
 	"github.com/apache/dubbo-go/remoting"
 	"github.com/stretchr/testify/assert"
-	"testing"
 )
 
 func Test_DataChange(t *testing.T) {