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authorFilipe David Borba Manana <fdmanana@apache.org>2011-08-18 05:50:42 +0000
committerFilipe David Borba Manana <fdmanana@apache.org>2011-08-18 05:50:42 +0000
commit82a10d77d0c206c89e640ca7097d8e12e95eb8be (patch)
tree834674bf643f2088c92331b44494f6721b3bc148 /test/etap
parent0dc0f8b41f627876f65183ea1d99c68b16abeae0 (diff)
Merge revision 1159045 from trunk
Fix dead lock case in the os process pool Part of this patch was done by Paul Davis. The patch also introduces a test case to validate that the os process pool (couch_query_servers) operates as it should. Closes COUCHDB-1246. git-svn-id: https://svn.apache.org/repos/asf/couchdb/branches/1.1.x@1159049 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'test/etap')
-rw-r--r--test/etap/210-os-proc-pool.t161
-rw-r--r--test/etap/Makefile.am4
2 files changed, 164 insertions, 1 deletions
diff --git a/test/etap/210-os-proc-pool.t b/test/etap/210-os-proc-pool.t
new file mode 100644
index 00000000..b68d66be
--- /dev/null
+++ b/test/etap/210-os-proc-pool.t
@@ -0,0 +1,161 @@
+#!/usr/bin/env escript
+%% -*- erlang -*-
+% 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.
+
+main(_) ->
+ test_util:init_code_path(),
+
+ etap:plan(19),
+ case (catch test()) of
+ ok ->
+ etap:end_tests();
+ Other ->
+ etap:diag(io_lib:format("Test died abnormally: ~p", [Other])),
+ etap:bail(Other)
+ end,
+ ok.
+
+
+test() ->
+ couch_server_sup:start_link(test_util:config_files()),
+ couch_config:set("query_server_config", "os_process_limit", "3", false),
+
+ test_pool_full(),
+ test_client_unexpected_exit(),
+
+ couch_server_sup:stop(),
+ ok.
+
+
+test_pool_full() ->
+ Client1 = spawn_client(),
+ Client2 = spawn_client(),
+ Client3 = spawn_client(),
+
+ etap:diag("Check that we can spawn the max number of processes."),
+ etap:is(ping_client(Client1), ok, "Client 1 started ok."),
+ etap:is(ping_client(Client2), ok, "Client 2 started ok."),
+ etap:is(ping_client(Client3), ok, "Client 3 started ok."),
+
+ Proc1 = get_client_proc(Client1, "1"),
+ Proc2 = get_client_proc(Client2, "2"),
+ Proc3 = get_client_proc(Client3, "3"),
+ etap:isnt(Proc1, Proc2, "Clients 1 and 2 got different procs."),
+ etap:isnt(Proc2, Proc3, "Clients 2 and 3 got different procs."),
+
+ etap:diag("Check that client 4 blocks waiting for a process."),
+ Client4 = spawn_client(),
+ etap:is(ping_client(Client4), timeout, "Client 4 blocked while waiting."),
+
+ etap:diag("Check that stopping a client gives up its process."),
+ etap:is(stop_client(Client1), ok, "First client stopped."),
+
+ etap:diag("And check that our blocked process has been unblocked."),
+ etap:is(ping_client(Client4), ok, "Client was unblocked."),
+
+ Proc4 = get_client_proc(Client4, "4"),
+ etap:is(Proc4, Proc1, "Client 4 got proc that client 1 got before."),
+
+ lists:map(fun(C) -> ok = stop_client(C) end, [Client2, Client3, Client4]).
+
+
+test_client_unexpected_exit() ->
+ Client1 = spawn_client(),
+ Client2 = spawn_client(),
+ Client3 = spawn_client(),
+
+ etap:diag("Check that up to os_process_limit clients started."),
+ etap:is(ping_client(Client1), ok, "Client 1 started ok."),
+ etap:is(ping_client(Client2), ok, "Client 2 started ok."),
+ etap:is(ping_client(Client3), ok, "Client 3 started ok."),
+
+ Proc1 = get_client_proc(Client1, "1"),
+ Proc2 = get_client_proc(Client2, "2"),
+ Proc3 = get_client_proc(Client3, "3"),
+ etap:isnt(Proc1, Proc2, "Clients 1 and 2 got different procs."),
+ etap:isnt(Proc2, Proc3, "Clients 2 and 3 got different procs."),
+
+ etap:diag("Check that killing a client frees an os_process."),
+ etap:is(kill_client(Client1), ok, "Client 1 died all right."),
+
+ etap:diag("Check that a new client is not blocked on boot."),
+ Client4 = spawn_client(),
+ etap:is(ping_client(Client4), ok, "New client booted without blocking."),
+
+ Proc4 = get_client_proc(Client4, "4"),
+ etap:isnt(Proc4, Proc1,
+ "Client 4 got a proc different from the one client 1 got before."),
+ etap:isnt(Proc4, Proc2, "Client 4's proc different from client 2's proc."),
+ etap:isnt(Proc4, Proc3, "Client 4's proc different from client 3's proc."),
+
+ lists:map(fun(C) -> ok = stop_client(C) end, [Client2, Client3, Client4]).
+
+
+spawn_client() ->
+ Parent = self(),
+ Ref = make_ref(),
+ Pid = spawn(fun() ->
+ Proc = couch_query_servers:get_os_process(<<"javascript">>),
+ loop(Parent, Ref, Proc)
+ end),
+ {Pid, Ref}.
+
+
+ping_client({Pid, Ref}) ->
+ Pid ! ping,
+ receive
+ {pong, Ref} -> ok
+ after 3000 -> timeout
+ end.
+
+
+get_client_proc({Pid, Ref}, ClientName) ->
+ Pid ! get_proc,
+ receive
+ {proc, Ref, Proc} -> Proc
+ after 3000 ->
+ etap:bail("Timeout getting client " ++ ClientName ++ " proc.")
+ end.
+
+
+stop_client({Pid, Ref}) ->
+ Pid ! stop,
+ receive
+ {stop, Ref} -> ok
+ after 3000 -> timeout
+ end.
+
+
+kill_client({Pid, Ref}) ->
+ Pid ! die,
+ receive
+ {die, Ref} -> ok
+ after 3000 -> timeout
+ end.
+
+
+loop(Parent, Ref, Proc) ->
+ receive
+ ping ->
+ Parent ! {pong, Ref},
+ loop(Parent, Ref, Proc);
+ get_proc ->
+ Parent ! {proc, Ref, Proc},
+ loop(Parent, Ref, Proc);
+ stop ->
+ couch_query_servers:ret_os_process(Proc),
+ Parent ! {stop, Ref};
+ die ->
+ Parent ! {die, Ref},
+ exit(some_error)
+ end.
diff --git a/test/etap/Makefile.am b/test/etap/Makefile.am
index ecbc3a93..c3a4ddab 100644
--- a/test/etap/Makefile.am
+++ b/test/etap/Makefile.am
@@ -87,4 +87,6 @@ EXTRA_DIST = \
180-http-proxy.ini \
180-http-proxy.t \
190-oauth.t \
- 200-view-group-no-db-leaks.t
+ 200-view-group-no-db-leaks.t \
+ 210-os-proc-pool.t
+