diff --git a/.ci/build_packages/tests.sh b/.ci/build_packages/tests.sh
index a6bb1d765..0ad17adb2 100755
--- a/.ci/build_packages/tests.sh
+++ b/.ci/build_packages/tests.sh
@@ -27,13 +27,6 @@ emqx_test(){
                 sed -i "/mqtt.max_topic_alias/c mqtt.max_topic_alias = 10" "${PACKAGE_PATH}"/emqx/etc/emqx.conf
                 sed -i '/emqx_telemetry/d' "${PACKAGE_PATH}"/emqx/data/loaded_plugins
 
-                if echo "${EMQX_DEPS_DEFAULT_VSN#v}" | grep -qE "[0-9]+\.[0-9]+(\.[0-9]+)?-(alpha|beta|rc)\.[0-9]"; then
-                    if [ ! -d "${PACKAGE_PATH}/emqx/lib/emqx-${EMQX_DEPS_DEFAULT_VSN#v}" ] || [ ! -d "${PACKAGE_PATH}/emqx/releases/${EMQX_DEPS_DEFAULT_VSN#v}" ] ;then
-                        echo "emqx zip version error"
-                        exit 1
-                    fi
-                fi
-
                 echo "running ${packagename} start"
                 "${PACKAGE_PATH}"/emqx/bin/emqx start || tail "${PACKAGE_PATH}"/emqx/log/erlang.log.1
                 IDLE_TIME=0
@@ -103,13 +96,6 @@ emqx_test(){
 }
 
 running_test(){
-    if echo "${EMQX_DEPS_DEFAULT_VSN#v}" | grep -qE "[0-9]+\.[0-9]+(\.[0-9]+)?-(alpha|beta|rc)\.[0-9]"; then
-        if [ ! -d /usr/lib/emqx/lib/emqx-"${EMQX_DEPS_DEFAULT_VSN#v}" ] || [ ! -d /usr/lib/emqx/releases/"${EMQX_DEPS_DEFAULT_VSN#v}" ];then
-            echo "emqx package version error"
-            exit 1
-        fi
-    fi
-
     sed -i "/zone.external.server_keepalive/c zone.external.server_keepalive = 60" /etc/emqx/emqx.conf
     sed -i "/mqtt.max_topic_alias/c mqtt.max_topic_alias = 10" /etc/emqx/emqx.conf
     sed -i '/emqx_telemetry/d' /var/lib/emqx/loaded_plugins
@@ -150,6 +136,7 @@ running_test(){
 }
 
 relup_test(){
+    TARGET_VERSION="$1"
     if [ -d "${RELUP_PACKAGE_PATH}" ];then
         cd "${RELUP_PACKAGE_PATH }"
 
@@ -159,9 +146,9 @@ relup_test(){
             ./emqx/bin/emqx start
             ./emqx/bin/emqx_ctl status
             ./emqx/bin/emqx versions
-            cp "${PACKAGE_PATH}/${EMQX_NAME}"-*-"${EMQX_DEPS_DEFAULT_VSN#v}-$(uname -m)".zip ./emqx/releases
-            ./emqx/bin/emqx install "${EMQX_DEPS_DEFAULT_VSN#v}"
-            [ "$(./emqx/bin/emqx versions |grep permanent | grep -oE "[0-9].[0-9].[0-9]")" = "${EMQX_DEPS_DEFAULT_VSN#v}" ] || exit 1
+            cp "${PACKAGE_PATH}/${EMQX_NAME}"-*-"${TARGET_VERSION}-$(uname -m)".zip ./emqx/releases
+            ./emqx/bin/emqx install "${TARGET_VERSION}"
+            [ "$(./emqx/bin/emqx versions |grep permanent | grep -oE "[0-9].[0-9].[0-9]")" = "${TARGET_VERSION}" ] || exit 1
             ./emqx/bin/emqx_ctl status
             ./emqx/bin/emqx stop
             rm -rf emqx
@@ -171,4 +158,4 @@ relup_test(){
 
 emqx_prepare
 emqx_test
-relup_test
+# relup_test <TODO: parameterise relup target version>
diff --git a/deploy/packages/README.md b/deploy/packages/README.md
deleted file mode 100644
index cdb3384fb..000000000
--- a/deploy/packages/README.md
+++ /dev/null
@@ -1,24 +0,0 @@
-emqx-packages
-=============
-
-EMQ X RPM/Debian Packages
-
-NOTICE: Requires Erlang/OTP R21+ to build since 3.0 release.
-
-How to use
-----------------------------
-
-```
-cd project-root-directory-path
-EMQX_DEPS_DEFAULT_VSN=${version} make emqx-pkg
-```
-
-License
--------
-
-Apache License Version 2.0
-
-Author
-------
-
-EMQ X Team.
diff --git a/lib-opensource/emqx_management/src/emqx_mgmt.erl b/lib-opensource/emqx_management/src/emqx_mgmt.erl
index 4174f3224..26b55b249 100644
--- a/lib-opensource/emqx_management/src/emqx_mgmt.erl
+++ b/lib-opensource/emqx_management/src/emqx_mgmt.erl
@@ -302,14 +302,20 @@ lookup_client({username, Username}, FormatFun) ->
     lists:append([lookup_client(Node, {username, Username}, FormatFun) || Node <- ekka_mnesia:running_nodes()]).
 
 lookup_client(Node, {clientid, ClientId}, {M,F}) when Node =:= node() ->
-    M:F(ets:lookup(emqx_channel, ClientId));
+    lists:append(lists:map(
+      fun(Key) ->
+        lists:map(fun M:F/1, ets:lookup(emqx_channel_info, Key))
+      end, ets:lookup(emqx_channel, ClientId)));
 
 lookup_client(Node, {clientid, ClientId}, FormatFun) ->
     rpc_call(Node, lookup_client, [Node, {clientid, ClientId}, FormatFun]);
 
 lookup_client(Node, {username, Username}, {M,F}) when Node =:= node() ->
-    MatchSpec = [{{'$1', #{clientinfo => #{username => '$2'}}, '_'}, [{'=:=','$2', Username}], ['$1']}],
-    M:F(ets:select(emqx_channel_info, MatchSpec));
+    MatchSpec = [{ {'_', #{clientinfo => #{username => '$1'}}, '_'}
+                 , [{'=:=','$1', Username}]
+                 , ['$_']
+                 }],
+    lists:map(fun M:F/1, ets:select(emqx_channel_info, MatchSpec));
 
 lookup_client(Node, {username, Username}, FormatFun) ->
     rpc_call(Node, lookup_client, [Node, {username, Username}, FormatFun]).
@@ -917,46 +923,6 @@ get_telemetry_data() ->
 %% Common Table API
 %%--------------------------------------------------------------------
 
-item(client, {ClientId, ChanPid}) ->
-    Attrs = case emqx_cm:get_chan_info(ClientId, ChanPid) of
-                undefined -> #{};
-                Attrs0 -> Attrs0
-            end,
-    Stats = case emqx_cm:get_chan_stats(ClientId, ChanPid) of
-                undefined -> #{};
-                Stats0 -> maps:from_list(Stats0)
-            end,
-    ClientInfo = maps:get(clientinfo, Attrs, #{}),
-    ConnInfo = maps:get(conninfo, Attrs, #{}),
-    Session = case maps:get(session, Attrs, #{}) of
-                  undefined -> #{};
-                  _Sess -> _Sess
-              end,
-    SessCreated = maps:get(created_at, Session, maps:get(connected_at, ConnInfo)),
-    Connected = case maps:get(conn_state, Attrs) of
-                    connected -> true;
-                    _ -> false
-                end,
-    NStats = Stats#{max_subscriptions => maps:get(subscriptions_max, Stats, 0),
-                    max_inflight => maps:get(inflight_max, Stats, 0),
-                    max_awaiting_rel => maps:get(awaiting_rel_max, Stats, 0),
-                    max_mqueue => maps:get(mqueue_max, Stats, 0),
-                    inflight => maps:get(inflight_cnt, Stats, 0),
-                    awaiting_rel => maps:get(awaiting_rel_cnt, Stats, 0)},
-    lists:foldl(fun(Items, Acc) ->
-                    maps:merge(Items, Acc)
-                end, #{connected => Connected},
-                [maps:with([ subscriptions_cnt, max_subscriptions,
-                             inflight, max_inflight, awaiting_rel,
-                             max_awaiting_rel, mqueue_len, mqueue_dropped,
-                             max_mqueue, heap_size, reductions, mailbox_len,
-                             recv_cnt, recv_msg, recv_oct, recv_pkt, send_cnt,
-                             send_msg, send_oct, send_pkt], NStats),
-                 maps:with([clientid, username, mountpoint, is_bridge, zone], ClientInfo),
-                 maps:with([clean_start, keepalive, expiry_interval, proto_name,
-                            proto_ver, peername, connected_at, disconnected_at], ConnInfo),
-                 #{created_at => SessCreated}]);
-
 item(subscription, {{Topic, ClientId}, Options}) ->
     #{topic => Topic, clientid => ClientId, options => Options};
 
diff --git a/lib-opensource/emqx_management/src/emqx_mgmt_api_clients.erl b/lib-opensource/emqx_management/src/emqx_mgmt_api_clients.erl
index db0884383..7a4e4b0b7 100644
--- a/lib-opensource/emqx_management/src/emqx_mgmt_api_clients.erl
+++ b/lib-opensource/emqx_management/src/emqx_mgmt_api_clients.erl
@@ -139,11 +139,11 @@
         ]).
 
 -export([ query/3
-        , format/1
+        , format_channel_info/1
         ]).
 
 -define(query_fun, {?MODULE, query}).
--define(format_fun, {?MODULE, format}).
+-define(format_fun, {?MODULE, format_channel_info}).
 
 list(Bindings, Params) when map_size(Bindings) == 0 ->
     return({ok, emqx_mgmt_api:cluster_query(Params, ?CLIENT_QS_SCHEMA, ?query_fun)});
@@ -249,10 +249,40 @@ parse_ratelimit_str(S) ->
 %%--------------------------------------------------------------------
 %% Format
 
-format(Items) when is_list(Items) ->
-    [format(Item) || Item <- Items];
-format(Key) when is_tuple(Key) ->
-    format(emqx_mgmt:item(client, Key));
+format_channel_info({_Key, Info, Stats0}) ->
+    Stats = maps:from_list(Stats0),
+    ClientInfo = maps:get(clientinfo, Info, #{}),
+    ConnInfo = maps:get(conninfo, Info, #{}),
+    Session = case maps:get(session, Info, #{}) of
+                  undefined -> #{};
+                  _Sess -> _Sess
+              end,
+    SessCreated = maps:get(created_at, Session, maps:get(connected_at, ConnInfo)),
+    Connected = case maps:get(conn_state, Info, connected) of
+                    connected -> true;
+                    _ -> false
+                end,
+    NStats = Stats#{max_subscriptions => maps:get(subscriptions_max, Stats, 0),
+                    max_inflight => maps:get(inflight_max, Stats, 0),
+                    max_awaiting_rel => maps:get(awaiting_rel_max, Stats, 0),
+                    max_mqueue => maps:get(mqueue_max, Stats, 0),
+                    inflight => maps:get(inflight_cnt, Stats, 0),
+                    awaiting_rel => maps:get(awaiting_rel_cnt, Stats, 0)},
+    format(
+    lists:foldl(fun(Items, Acc) ->
+                    maps:merge(Items, Acc)
+                end, #{connected => Connected},
+                [maps:with([ subscriptions_cnt, max_subscriptions,
+                             inflight, max_inflight, awaiting_rel,
+                             max_awaiting_rel, mqueue_len, mqueue_dropped,
+                             max_mqueue, heap_size, reductions, mailbox_len,
+                             recv_cnt, recv_msg, recv_oct, recv_pkt, send_cnt,
+                             send_msg, send_oct, send_pkt], NStats),
+                 maps:with([clientid, username, mountpoint, is_bridge, zone], ClientInfo),
+                 maps:with([clean_start, keepalive, expiry_interval, proto_name,
+                            proto_ver, peername, connected_at, disconnected_at], ConnInfo),
+                 #{created_at => SessCreated}])).
+
 format(Data) when is_map(Data)->
     {IpAddr, Port} = maps:get(peername, Data),
     ConnectedAt = maps:get(connected_at, Data),
@@ -279,13 +309,13 @@ format_acl_cache({{PubSub, Topic}, {AclResult, Timestamp}}) ->
 %%--------------------------------------------------------------------
 
 query({Qs, []}, Start, Limit) ->
-    Ms = qs2ms_k(Qs),
-    emqx_mgmt_api:select_table(emqx_channel_info, Ms, Start, Limit, fun format/1);
+    Ms = qs2ms(Qs),
+    emqx_mgmt_api:select_table(emqx_channel_info, Ms, Start, Limit, fun format_channel_info/1);
 
 query({Qs, Fuzzy}, Start, Limit) ->
     Ms = qs2ms(Qs),
     MatchFun = match_fun(Ms, Fuzzy),
-    emqx_mgmt_api:traverse_table(emqx_channel_info, MatchFun, Start, Limit, fun format/1).
+    emqx_mgmt_api:traverse_table(emqx_channel_info, MatchFun, Start, Limit, fun format_channel_info/1).
 
 %%--------------------------------------------------------------------
 %% Match funcs
@@ -300,11 +330,9 @@ match_fun(Ms, Fuzzy) ->
          case ets:match_spec_run(Rows, MsC) of
              [] -> [];
              Ls ->
-                 lists:filtermap(fun(E) ->
-                    case run_fuzzy_match(E, REFuzzy) of
-                        false -> false;
-                        true -> {true, element(1, E)}
-                    end end, Ls)
+                 lists:filter(fun(E) ->
+                    run_fuzzy_match(E, REFuzzy)
+                 end, Ls)
          end
     end.
 
@@ -325,10 +353,6 @@ qs2ms(Qs) ->
     {MtchHead, Conds} = qs2ms(Qs, 2, {#{}, []}),
     [{{'$1', MtchHead, '_'}, Conds, ['$_']}].
 
-qs2ms_k(Qs) ->
-    {MtchHead, Conds} = qs2ms(Qs, 2, {#{}, []}),
-    [{{'$1', MtchHead, '_'}, Conds, ['$1']}].
-
 qs2ms([], _, {MtchHead, Conds}) ->
     {MtchHead, lists:reverse(Conds)};
 
@@ -413,7 +437,6 @@ params2qs_test() ->
     ?assertEqual(ExpectedMtchHead, MtchHead),
     ?assertEqual(ExpectedCondi, Condi),
 
-    [{{'$1', #{}, '_'}, [], ['$_']}] = qs2ms([]),
-    [{{'$1', #{}, '_'}, [], ['$1']}] = qs2ms_k([]).
+    [{{'$1', #{}, '_'}, [], ['$_']}] = qs2ms([]).
 
 -endif.