Major Description
While looking at a customer issue where the number of ns_server to memcached "system" connections is exceeding the 5000 limit in memcached it was noticed the socket pool created by ns_server is larger than 5000. In ns_memcached_sockets_pool
start_link() ->
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Options = [{name, ?MODULE}, |
{connection_timeout, 30000},
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{pool_size_per_dest, 10000}],
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ns_connection_pool:start_link(Options). |
which calls
init(Options) -> |
process_flag(priority, high),
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case lists:member({seed,1}, ssl:module_info(exports)) of |
true ->
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%% Make sure that the ssl random number generator is seeded |
%% This was new in R13 (ssl-3.10.1 in R13B vs. ssl-3.10.0 in R12B-5) |
apply(ssl, seed, [crypto:strong_rand_bytes(255)]); |
false ->
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ok
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end, |
Timeout = proplists:get_value(connection_timeout, Options), |
Size = proplists:get_value(pool_size_per_dest, Options), |
{ok, #ns_connection_pool{timeout = Timeout, pool_size_per_dest = Size}}. |
And so ns_server allows 10,000 connections before it starts queuing them
handle_call({socket, Pid, Dest}, {Pid, _Ref} = From, |
#ns_connection_pool{pool_size_per_dest = MaxSize} = State) -> |
{Reply0, State2} = find_socket(Dest, Pid, State), |
case Reply0 of |
{ok, _Socket} -> |
State3 = monitor_client(Dest, From, State2), |
{reply, Reply0, State3}; |
no_socket ->
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case dest_clients_count(Dest, State2) >= MaxSize of |
true ->
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{noreply, add_to_queue(Dest, From, State2)}; <<<<<<<<<<<<<<<<<<< |
false ->
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{reply, no_socket, monitor_client(Dest, From, State2)} |
end |
end; |
The initial 10000 should be changed to 5000.