diff --git a/apps/emqx_connector/src/emqx_connector_mysql.erl b/apps/emqx_connector/src/emqx_connector_mysql.erl
index fe495252a..c69cf5ca0 100644
--- a/apps/emqx_connector/src/emqx_connector_mysql.erl
+++ b/apps/emqx_connector/src/emqx_connector_mysql.erl
@@ -437,7 +437,7 @@ do_sql_query(SQLFunc, Conn, SQLOrKey, Params, Timeout, LogMeta) ->
                 error,
                 LogMeta#{msg => "mysql_connector_do_sql_query_failed", reason => disconnected}
             ),
-            %% kill the poll worker to trigger reconnection
+            %% kill the pool worker to trigger reconnection
             _ = exit(Conn, restart),
             {error, {recoverable_error, disconnected}};
         {error, not_prepared} = Error ->
diff --git a/lib-ee/emqx_ee_connector/src/emqx_ee_connector_cassa.erl b/lib-ee/emqx_ee_connector/src/emqx_ee_connector_cassa.erl
index 1e1882a1f..ce964dd17 100644
--- a/lib-ee/emqx_ee_connector/src/emqx_ee_connector_cassa.erl
+++ b/lib-ee/emqx_ee_connector/src/emqx_ee_connector_cassa.erl
@@ -1,18 +1,7 @@
 %%--------------------------------------------------------------------
 %% Copyright (c) 2023 EMQ Technologies Co., Ltd. All Rights Reserved.
-%%
-%% Licensed 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.
 %%--------------------------------------------------------------------
+
 -module(emqx_ee_connector_cassa).
 
 -behaviour(emqx_resource).
diff --git a/lib-ee/emqx_ee_connector/src/emqx_ee_connector_clickhouse.erl b/lib-ee/emqx_ee_connector/src/emqx_ee_connector_clickhouse.erl
index 5d68687dc..3749ecc6e 100644
--- a/lib-ee/emqx_ee_connector/src/emqx_ee_connector_clickhouse.erl
+++ b/lib-ee/emqx_ee_connector/src/emqx_ee_connector_clickhouse.erl
@@ -1,17 +1,5 @@
 %%--------------------------------------------------------------------
-%% Copyright (c) 2020-2023 EMQ Technologies Co., Ltd. All Rights Reserved.
-%%
-%% Licensed 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.
+%% Copyright (c) 2023 EMQ Technologies Co., Ltd. All Rights Reserved.
 %%--------------------------------------------------------------------
 
 -module(emqx_ee_connector_clickhouse).
diff --git a/lib-ee/emqx_ee_connector/test/ee_connector_clickhouse_SUITE.erl b/lib-ee/emqx_ee_connector/test/ee_connector_clickhouse_SUITE.erl
index 111deba06..c608588a1 100644
--- a/lib-ee/emqx_ee_connector/test/ee_connector_clickhouse_SUITE.erl
+++ b/lib-ee/emqx_ee_connector/test/ee_connector_clickhouse_SUITE.erl
@@ -1,17 +1,6 @@
-% %%--------------------------------------------------------------------
-% %% Copyright (c) 2020-2023 EMQ Technologies Co., Ltd. All Rights Reserved.
-% %%
-% %% Licensed 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.
-% %%--------------------------------------------------------------------
+%%--------------------------------------------------------------------
+%% Copyright (c) 2023 EMQ Technologies Co., Ltd. All Rights Reserved.
+%%--------------------------------------------------------------------
 
 -module(ee_connector_clickhouse_SUITE).
 
diff --git a/lib-ee/emqx_ee_connector/test/emqx_ee_connector_cassa_SUITE.erl b/lib-ee/emqx_ee_connector/test/emqx_ee_connector_cassa_SUITE.erl
index 95b4407cf..52ed03a62 100644
--- a/lib-ee/emqx_ee_connector/test/emqx_ee_connector_cassa_SUITE.erl
+++ b/lib-ee/emqx_ee_connector/test/emqx_ee_connector_cassa_SUITE.erl
@@ -1,16 +1,5 @@
 %%--------------------------------------------------------------------
-%% Copyright (c) 2020-2023 EMQ Technologies Co., Ltd. All Rights Reserved.
-%%
-%% Licensed 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.
+%% Copyright (c) 2023 EMQ Technologies Co., Ltd. All Rights Reserved.
 %%--------------------------------------------------------------------
 
 -module(emqx_ee_connector_cassa_SUITE).