52BlxIPBaHKVVYl95adzLA changeset

Changeset353530393535 (b)
ParentNone (a)
ab
0+%%%-------------------------------------------------------------------
0+%% Reproduces CLOSE-WAIT conditions in CouchBeam.
0+%% Observe in a terminal
0+%%  > watch -n 1 "ss -p -o state close-wait '( dport = 5984 )' | wc -l "
0+%%
0+%% Run couchbed:run() to reproduce the CLOSE-WAIT condition.
0+%% The condition appears after about 60 secondes, one CLOSE-WAIT socket
0+%% per killed couchbeam_view_stream process.
0+%%%-------------------------------------------------------------------
0+
0+-module(couchbed).
0+-export([run/0, start_client/0, start/0, get/0, generate_and_store_docs/2, create_view/1, query_view/2]).
0+
0+
0+-define(DB_NAME, "close_wait").
0+-define(VIEW, {"design", "view"}).
0+-define(COUCH_URL, "http://localhost:5984").
0+-define(OPTIONS, [{basic_auth, {"admin", "admin"}}]).
0+
0+-define(MAX, 50).
0+-spec run() -> ok.
0+run() ->
0+    start(),
0+    Db = ?MODULE:get(),
0+    io:format("~p~n", [Db]),
0+    %generate_and_store_docs(Db, 50),
0+    Pid = start_client(),
0+    create_view(Db),
0+    query_view(Db, Pid),
0+    io:format("~p~n", [hackney_pool:get_stats(default)]),
0+    ok.
0+
0+
0+-spec query_view(couchbeam:db(), pid()) -> ok.
0+query_view(Db, Pid) ->
0+    lists:foreach(fun(_N) ->
0+        {ok, _Ref } = couchbeam_view:stream(Db, ?VIEW, [{stream_to, Pid}]),
0+        ok
0+    end, lists:seq(1, ?MAX)),
0+    kill_view_stream_process(),
0+    ok.
0+
0+-spec start_client() -> pid().
0+start_client() ->
0+    Pid = spawn(fun() -> loop() end),
0+    Pid.
0+
0+-spec loop() -> no_return().
0+loop() ->
0+    receive
0+        _Message ->
0+            case rand:uniform(400) of
0+            1 ->
0+                io:format("~p~n", [hackney_pool:get_stats(default)]),
0+                loop();
0+            _ ->
0+                loop()
0+            end
0+    end.
0+
0+-spec get() -> couchbeam:db().
0+get() ->
0+    S = couchbeam:server_connection(?COUCH_URL, ?OPTIONS),
0+    DbName =  uri_string:quote(?DB_NAME),
0+    {ok, Db} = case couchbeam:db_exists(S,DbName) of
0+        true -> couchbeam:open_db(S, DbName, []);
0+        false -> couchbeam:create_db(S,DbName),
0+                    couchbeam:open_db(S, DbName, [])
0+    end,
0+
0+    Db.
0+
0+
0+-spec kill_view_stream_process() -> ok.
0+kill_view_stream_process() ->
0+    killall(ets:tab2list(couchbeam_view_streams)).
0+
0+-spec killall(list()) -> ok.
0+killall([]) -> ok;
0+killall([{_Ref, Pid} | Pids]) ->
0+        % kill 10% of
0+        case rand:uniform(10) of
0+        1 ->
0+          io:format("killing ~p~n", [Pid]),
0+          exit(Pid, kill);
0+        _ ->
0+          ok
0+        end,
0+    killall(Pids).
0+
0+-spec generate_and_store_docs(couchbeam:db(), non_neg_integer()) -> ok.
0+generate_and_store_docs(Db, N) ->
0+    io:format("creating ~p docs~n", [N]),
0+    lists:foreach(fun(_) ->
0+        Doc = {[{<<"type">>,<<"random_doc">>}, {<<"value">>, rand:uniform(1000)}]},
0+        io:format("."),
0+        {ok, _Doc} = couchbeam:save_doc(Db, Doc)
0+    end, lists:seq(1, N)),
0+    io:format("~n"),
0+    ok.
0+
0+-spec create_view(couchbeam:db()) -> ok.
0+create_view(Db) ->
0+    {Design, View} = ?VIEW,
0+    create_view(Db, list_to_binary(Design), list_to_binary(View)).
0+
0+-spec create_view(couchbeam:db(), binary(), binary()) -> couchbeam:document().
0+create_view(Db, Design, View) ->
0+    DesignDoc = {[
0+        {<<"_id">>, <<"_design/",Design/binary>>},
0+        {<<"language">>,<<"javascript">>},
0+        {<<"views">>,
0+            {[{View,
0+                {[{<<"map">>,
0+                    <<"function (doc) {\n emit(doc._id, doc); \n}">>
0+                }]}
0+            }]}
0+        }
0+    ]},
0+    case couchbeam:save_doc(Db, DesignDoc) of
0+        {ok, DesignDoc1} ->
0+            io:format("Created view"),
0+            DesignDoc1;
0+        {error, conflict} ->
0+            io:format("View already exists"),
0+            ok;
0+        {error, Reason} ->
0+            io:format("Error creating view: ~p~n", [Reason]),
0+            error
0+    end.
0+
0+-spec start() -> ok.
0+start() ->
0+    application:start(inets),
0+    application:ensure_all_started(couchbeam),
0+    io:format("Everything started~n").
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--- Revision None
+++ Revision 353530393535
@@ -0,0 +1,136 @@
+%%%-------------------------------------------------------------------
+%% Reproduces CLOSE-WAIT conditions in CouchBeam.
+%% Observe in a terminal
+%%  > watch -n 1 "ss -p -o state close-wait '( dport = 5984 )' | wc -l "
+%% 
+%% Run couchbed:run() to reproduce the CLOSE-WAIT condition.
+%% The condition appears after about 60 secondes, one CLOSE-WAIT socket
+%% per killed couchbeam_view_stream process.
+%%%-------------------------------------------------------------------
+
+-module(couchbed).
+-export([run/0, start_client/0, start/0, get/0, generate_and_store_docs/2, create_view/1, query_view/2]).
+
+
+-define(DB_NAME, "close_wait").
+-define(VIEW, {"design", "view"}).
+-define(COUCH_URL, "http://localhost:5984").
+-define(OPTIONS, [{basic_auth, {"admin", "admin"}}]).
+
+-define(MAX, 50).
+-spec run() -> ok.
+run() ->
+    start(),
+    Db = ?MODULE:get(),
+    io:format("~p~n", [Db]),
+    %generate_and_store_docs(Db, 50),
+    Pid = start_client(),
+    create_view(Db),
+    query_view(Db, Pid),
+    io:format("~p~n", [hackney_pool:get_stats(default)]),
+    ok.
+
+
+-spec query_view(couchbeam:db(), pid()) -> ok.
+query_view(Db, Pid) ->
+    lists:foreach(fun(_N) ->
+        {ok, _Ref } = couchbeam_view:stream(Db, ?VIEW, [{stream_to, Pid}]),
+        ok
+    end, lists:seq(1, ?MAX)),
+    kill_view_stream_process(),
+    ok.
+
+-spec start_client() -> pid().
+start_client() ->
+    Pid = spawn(fun() -> loop() end),
+    Pid.
+
+-spec loop() -> no_return().
+loop() ->
+    receive
+        _Message ->
+            case rand:uniform(400) of
+            1 ->
+                io:format("~p~n", [hackney_pool:get_stats(default)]),
+                loop();
+            _ ->
+                loop()
+            end
+    end.
+
+-spec get() -> couchbeam:db().
+get() ->
+    S = couchbeam:server_connection(?COUCH_URL, ?OPTIONS),
+    DbName =  uri_string:quote(?DB_NAME),
+    {ok, Db} = case couchbeam:db_exists(S,DbName) of
+        true -> couchbeam:open_db(S, DbName, []);
+        false -> couchbeam:create_db(S,DbName),
+                    couchbeam:open_db(S, DbName, [])
+    end,
+
+    Db.
+
+
+-spec kill_view_stream_process() -> ok.
+kill_view_stream_process() ->
+    killall(ets:tab2list(couchbeam_view_streams)).
+
+-spec killall(list()) -> ok.
+killall([]) -> ok;
+killall([{_Ref, Pid} | Pids]) ->
+        % kill 10% of 
+        case rand:uniform(10) of
+        1 ->
+          io:format("killing ~p~n", [Pid]),
+          exit(Pid, kill);
+        _ ->
+          ok
+        end,
+    killall(Pids).
+
+-spec generate_and_store_docs(couchbeam:db(), non_neg_integer()) -> ok.
+generate_and_store_docs(Db, N) ->
+    io:format("creating ~p docs~n", [N]),
+    lists:foreach(fun(_) ->
+        Doc = {[{<<"type">>,<<"random_doc">>}, {<<"value">>, rand:uniform(1000)}]},
+        io:format("."),
+        {ok, _Doc} = couchbeam:save_doc(Db, Doc)
+    end, lists:seq(1, N)),
+    io:format("~n"),
+    ok.
+
+-spec create_view(couchbeam:db()) -> ok.
+create_view(Db) ->
+    {Design, View} = ?VIEW,
+    create_view(Db, list_to_binary(Design), list_to_binary(View)).
+
+-spec create_view(couchbeam:db(), binary(), binary()) -> couchbeam:document().
+create_view(Db, Design, View) ->
+    DesignDoc = {[
+        {<<"_id">>, <<"_design/",Design/binary>>},
+        {<<"language">>,<<"javascript">>},
+        {<<"views">>,
+            {[{View,
+                {[{<<"map">>,
+                    <<"function (doc) {\n emit(doc._id, doc); \n}">>
+                }]}
+            }]}
+        }
+    ]},
+    case couchbeam:save_doc(Db, DesignDoc) of
+        {ok, DesignDoc1} ->
+            io:format("Created view"),
+            DesignDoc1;
+        {error, conflict} ->
+            io:format("View already exists"),
+            ok;
+        {error, Reason} ->
+            io:format("Error creating view: ~p~n", [Reason]),
+            error
+    end.
+
+-spec start() -> ok.
+start() ->
+    application:start(inets),
+    application:ensure_all_started(couchbeam),
+    io:format("Everything started~n").