/
stats_collector.erl
502 lines (452 loc) · 20.4 KB
/
stats_collector.erl
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%% @author Northscale <info@northscale.com>
%% @copyright 2009 NorthScale, Inc.
%%
%% 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(stats_collector).
-include_lib("eunit/include/eunit.hrl").
-include("ns_common.hrl").
-behaviour(gen_server).
-define(LOG_FREQ, 100). % Dump every n collections to the log
-define(WIDTH, 30). % Width of the key part of the formatted logs
%% API
-export([start_link/1]).
-export([format_stats/1]).
-record(state, {bucket,
last_plain_counters,
last_tap_counters,
last_timings_counters,
count = ?LOG_FREQ,
last_ts}).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2,
handle_info/2, terminate/2, code_change/3]).
-define(NEED_TAP_STREAM_STATS_CODE, 1).
-include("ns_stats.hrl").
start_link(Bucket) ->
gen_server:start_link(?MODULE, Bucket, []).
init(Bucket) ->
ns_pubsub:subscribe_link(ns_tick_event),
{ok, #state{bucket=Bucket}}.
handle_call(unhandled, unhandled, unhandled) ->
unhandled.
handle_cast(unhandled, unhandled) ->
unhandled.
interesting_timing_key(<<"disk_update_", _/binary>>) -> true;
interesting_timing_key(<<"disk_commit_", _/binary>>) -> true;
interesting_timing_key(<<"bg_wait_", _/binary>>) -> true;
interesting_timing_key(_) -> false.
%% drops irrelevant keys from proplist for performance
prefilter_timings(RawTimings) ->
[KV || {K, _} = KV <- RawTimings,
interesting_timing_key(K)].
grab_all_stats(Bucket) ->
{ok, Stats} = ns_memcached:stats(Bucket),
TapStats = case ns_memcached:stats(Bucket, <<"tapagg _">>) of
{ok, Values} -> Values;
{memcached_error, key_enoent, _} -> []
end,
Timings = case ns_memcached:stats(Bucket, <<"timings">>) of
{ok, ValuesK} ->
prefilter_timings(ValuesK);
{memcached_error, key_enoent, _} -> []
end,
{Stats, TapStats, Timings}.
handle_info({tick, TS}, #state{bucket=Bucket} = State) ->
GrabFreq = misc:get_env_default(grab_stats_every_n_ticks, 1),
GrabNow = 0 =:= (State#state.count rem GrabFreq),
case GrabNow of
true ->
try grab_all_stats(Bucket) of
GrabbedStats ->
TS1 = latest_tick(TS),
State1 = process_grabbed_stats(TS1, GrabbedStats, State),
PlainStats = element(1, GrabbedStats),
State2 = maybe_log_stats(TS1, State1, PlainStats),
{noreply, State2}
catch T:E ->
?stats_error("Exception in stats collector: ~p~n",
[{T,E, erlang:get_stacktrace()}]),
{noreply, State#state{count = State#state.count + 1}}
end;
false ->
{noreply, State#state{count = State#state.count + 1}}
end;
handle_info(_Msg, State) -> % Don't crash on delayed responses to calls
{noreply, State}.
maybe_log_stats(TS, State, RawStats) ->
OldCount = State#state.count,
case OldCount >= ?LOG_FREQ of
true ->
case misc:get_env_default(dont_log_stats, false) of
false ->
TSMicros = TS rem 1000000,
TSSec0 = TS div 1000000,
TSMega = TSSec0 div 1000000,
TSSec = TSSec0 rem 1000000,
?stats_debug("(at ~p) Stats for bucket ~p:~n~s",
[calendar:now_to_local_time({TSMega, TSSec, TSMicros}),
State#state.bucket, format_stats(RawStats)]);
_ -> ok
end,
State#state{count = 1};
false ->
State#state{count = OldCount + 1}
end.
process_grabbed_stats(TS,
{PlainStats, TapStats, Timings},
#state{bucket = Bucket,
last_plain_counters = LastPlainCounters,
last_tap_counters = LastTapCounters,
last_timings_counters = LastTimingsCounters,
last_ts = LastTS} = State) ->
{PlainValues, PlainCounters} = parse_plain_stats(TS, PlainStats, LastTS, LastPlainCounters),
{TapValues, TapCounters} = parse_tapagg_stats(TS, TapStats, LastTS, LastTapCounters),
{TimingValues, TimingsCounters} = parse_timings(TS, Timings, LastTS, LastTimingsCounters),
%% Don't send event with undefined values
case lists:member(undefined, [LastTapCounters, LastTapCounters, LastTimingsCounters]) of
false ->
Values = lists:merge([PlainValues, TapValues, TimingValues]),
Entry = #stat_entry{timestamp = TS,
values = Values},
gen_event:notify(ns_stats_event, {stats, Bucket, Entry});
true ->
ok
end,
State#state{last_plain_counters = PlainCounters,
last_tap_counters = TapCounters,
last_timings_counters = TimingsCounters,
last_ts = TS}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%% Internal functions
format_stats(Stats) ->
erlang:list_to_binary(
[[K, lists:duplicate(erlang:max(1, ?WIDTH - byte_size(K)), $\s), V, $\n]
|| {K, V} <- lists:sort(Stats)]).
latest_tick(TS) ->
latest_tick(TS, 0).
latest_tick(TS, NumDropped) ->
receive
{tick, TS1} ->
latest_tick(TS1, NumDropped + 1)
after 0 ->
if NumDropped > 0 ->
?stats_warning("Dropped ~b ticks", [NumDropped]);
true ->
ok
end,
TS
end.
translate_stat(bytes) -> % memcached calls it bytes
mem_used;
translate_stat(Stat) ->
Stat.
sum_stat_values(Dict, [FirstName | RestNames]) ->
lists:foldl(fun (Name, Acc) ->
orddict:fetch(Name, Dict) + Acc
end, orddict:fetch(FirstName, Dict), RestNames).
extract_agg_tap_stats(KVs) ->
lists:foldl(fun ({K, V}, Acc) -> extract_agg_stat(K, V, Acc) end,
#tap_stream_stats{}, KVs).
mk_stats_dict_get(Dict) ->
fun (K) ->
case orddict:find(K, Dict) of
{ok, V} -> list_to_integer(binary_to_list(V));
%% Some stats don't exist in some bucket types
error -> 0
end
end.
parse_stats_raw(TS, Stats, LastCounters, LastTS, KnownGauges, KnownCounters) ->
Dict = orddict:from_list([{translate_stat(binary_to_atom(K, latin1)), V}
|| {K, V} <- Stats]),
diff_stats_counters(TS, LastCounters, LastTS, KnownGauges, KnownCounters,
mk_stats_dict_get(Dict)).
diff_stats_counters(TS, LastCounters, LastTS, KnownGauges, KnownCounters, GetValue) ->
Gauges = [GetValue(K) || K <- KnownGauges],
Counters = [GetValue(K) || K <- KnownCounters],
Deltas = case LastCounters of
undefined ->
lists:duplicate(length(KnownCounters), 0);
_ ->
Delta = TS - LastTS,
if Delta > 0 ->
lists:zipwith(
fun (A, B) ->
Res = (A - B) * 1000.0/Delta,
if Res < 0 -> 0;
true -> Res
end
end, Counters, LastCounters);
true ->
lists:duplicate(length(KnownCounters),
0)
end
end,
Values0 = orddict:merge(fun (_, _, _) -> erlang:error(cannot_happen) end,
lists:sort(lists:zip(KnownGauges, Gauges)),
lists:sort(lists:zip(KnownCounters, Deltas))),
{Values0, Counters}.
parse_aggregate_tap_stats(AggTap) ->
ReplicaStats = extract_agg_tap_stats([{K, V} || {<<"replication:", K/binary>>, V} <- AggTap]),
RebalanceStats = extract_agg_tap_stats([{K, V} || {<<"rebalance:", K/binary>>, V} <- AggTap]),
NonUserStats = add_tap_stream_stats(ReplicaStats, RebalanceStats),
TotalStats = extract_agg_tap_stats([{K, V} || {<<"_total:", K/binary>>, V} <- AggTap]),
UserStats = sub_tap_stream_stats(TotalStats, NonUserStats),
lists:append([tap_stream_stats_to_kvlist(<<"ep_tap_rebalance_">>, RebalanceStats),
tap_stream_stats_to_kvlist(<<"ep_tap_replica_">>, ReplicaStats),
tap_stream_stats_to_kvlist(<<"ep_tap_user_">>, UserStats),
tap_stream_stats_to_kvlist(<<"ep_tap_total_">>, TotalStats)]).
parse_plain_stats(TS, PlainStats, LastTS, LastPlainCounters) ->
{Values0, Counters} = parse_stats_raw(TS, PlainStats, LastPlainCounters, LastTS,
[?STAT_GAUGES], [?STAT_COUNTERS]),
AggregateValues = [{ops, sum_stat_values(Values0, [cmd_get, cmd_set,
incr_misses, incr_hits,
decr_misses, decr_hits,
delete_misses, delete_hits])},
{misses, sum_stat_values(Values0, [get_misses, delete_misses,
incr_misses, decr_misses,
cas_misses])},
{disk_write_queue, sum_stat_values(Values0, [ep_queue_size, ep_flusher_todo])},
{ep_ht_memory, sum_stat_values(Values0, [vb_active_ht_memory,
vb_replica_ht_memory,
vb_pending_ht_memory])},
{ep_ops_create, sum_stat_values(Values0, [vb_active_ops_create,
vb_replica_ops_create,
vb_pending_ops_create])},
{ep_ops_update, sum_stat_values(Values0, [vb_active_ops_update,
vb_replica_ops_update,
vb_pending_ops_update])},
{vb_total_queue_age, sum_stat_values(Values0, [vb_active_queue_age,
vb_replica_queue_age,
vb_pending_queue_age])}
],
Values = orddict:merge(fun (_K, _V1, _V2) -> erlang:error(cannot_happen) end,
Values0,
lists:sort(AggregateValues)),
{Values, Counters}.
parse_tapagg_stats(TS, TapStats, LastTS, LastTapCounters) ->
parse_stats_raw(TS, parse_aggregate_tap_stats(TapStats),
LastTapCounters, LastTS,
[?TAP_STAT_GAUGES], [?TAP_STAT_COUNTERS]).
parse_timing_range(Rest) ->
{Begin, End} = misc:split_binary_at_char(Rest, $,),
{list_to_integer(binary_to_list(Begin)),
list_to_integer(binary_to_list(End))}.
parse_timing_key(Prefix, Key) ->
case (catch erlang:split_binary(Key, erlang:size(Prefix))) of
{Prefix, Suffix} ->
parse_timing_range(Suffix);
_ ->
nothing
end.
aggregate_timings(_Prefix, [], TotalCount, TotalAggregate) ->
{TotalCount, TotalAggregate};
aggregate_timings(Prefix, [{K, V} | TimingsRest], TotalCount, TotalAggregate) ->
case parse_timing_key(Prefix, K) of
{Start, End} ->
ThisSeeks = list_to_integer(binary_to_list(V)),
NewSeeks = TotalCount + ThisSeeks,
NewDistance = TotalAggregate + (End + Start) * 0.5 * ThisSeeks,
aggregate_timings(Prefix, TimingsRest, NewSeeks, NewDistance);
nothing ->
aggregate_timings(Prefix, TimingsRest, TotalCount, TotalAggregate)
end.
parse_timings(TS, Timings, LastTS, LastTimingCounters) ->
{BGWaitCount, BGWaitTotal} = aggregate_timings(<<"bg_wait_">>, Timings, 0, 0),
{DiskCommitCount, DiskCommitTotal} = aggregate_timings(<<"disk_commit_">>, Timings, 0, 0),
{DiskUpdateCount, DiskUpdateTotal} = aggregate_timings(<<"disk_update_">>, Timings, 0, 0),
diff_stats_counters(TS, LastTimingCounters, LastTS,
[], [bg_wait_count, bg_wait_total,
disk_commit_count, disk_commit_total,
disk_update_count, disk_update_total],
fun (bg_wait_count) -> BGWaitCount;
(bg_wait_total) -> BGWaitTotal;
(disk_commit_count) -> DiskCommitCount;
(disk_commit_total) -> DiskCommitTotal;
(disk_update_count) -> DiskUpdateCount;
(disk_update_total) -> DiskUpdateTotal
end).
%% Tests
parse_stats_test() ->
Now = misc:time_to_epoch_ms_int(now()),
Input =
[{<<"conn_yields">>,<<"0">>},
{<<"threads">>,<<"4">>},
{<<"rejected_conns">>,<<"0">>},
{<<"limit_maxbytes">>,<<"67108864">>},
{<<"bytes_written">>,<<"823281">>},
{<<"bytes_read">>,<<"37610">>},
{<<"cas_badval">>,<<"0">>},
{<<"cas_hits">>,<<"0">>},
{<<"cas_misses">>,<<"0">>},
{<<"decr_hits">>,<<"0">>},
{<<"decr_misses">>,<<"0">>},
{<<"incr_hits">>,<<"0">>},
{<<"incr_misses">>,<<"0">>},
{<<"delete_hits">>,<<"0">>},
{<<"delete_misses">>,<<"0">>},
{<<"get_misses">>,<<"0">>},
{<<"get_hits">>,<<"0">>},
{<<"auth_errors">>,<<"0">>},
{<<"auth_cmds">>,<<"0">>},
{<<"cmd_flush">>,<<"0">>},
{<<"cmd_set">>,<<"0">>},
{<<"cmd_get">>,<<"0">>},
{<<"connection_structures">>,<<"11">>},
{<<"total_connections">>,<<"11">>},
{<<"curr_connections">>,<<"11">>},
{<<"daemon_connections">>,<<"10">>},
{<<"rusage_system">>,<<"0.067674">>},
{<<"rusage_user">>,<<"0.149256">>},
{<<"pointer_size">>,<<"64">>},
{<<"libevent">>,<<"1.4.14b-stable">>},
{<<"version">>,<<"1.4.4_209_g7b9e75f">>},
{<<"time">>,<<"1285969960">>},
{<<"uptime">>,<<"103">>},
{<<"pid">>,<<"56368">>},
{<<"bucket_conns">>,<<"1">>},
{<<"ep_num_non_resident">>,<<"0">>},
{<<"ep_pending_ops_max_duration">>,<<"0">>},
{<<"ep_pending_ops_max">>,<<"0">>},
{<<"ep_pending_ops_total">>,<<"0">>},
{<<"ep_pending_ops">>,<<"0">>},
{<<"ep_io_write_bytes">>,<<"0">>},
{<<"ep_io_read_bytes">>,<<"0">>},
{<<"ep_io_num_write">>,<<"0">>},
{<<"ep_io_num_read">>,<<"0">>},
{<<"ep_warmup">>,<<"true">>},
{<<"ep_dbinit">>,<<"0">>},
{<<"ep_dbname">>,<<"./data/n_0/default">>},
{<<"ep_tap_keepalive">>,<<"0">>},
{<<"ep_warmup_time">>,<<"0">>},
{<<"ep_warmup_oom">>,<<"0">>},
{<<"ep_warmup_dups">>,<<"0">>},
{<<"ep_warmed_up">>,<<"0">>},
{<<"ep_warmup_thread">>,<<"complete">>},
{<<"ep_num_not_my_vbuckets">>,<<"0">>},
{<<"ep_num_eject_failures">>,<<"0">>},
{<<"ep_num_value_ejects">>,<<"5">>},
{<<"ep_num_expiry_pager_runs">>,<<"0">>},
{<<"ep_num_pager_runs">>,<<"0">>},
{<<"ep_bg_fetched">>,<<"0">>},
{<<"ep_storage_type">>,<<"featured">>},
{<<"ep_tmp_oom_errors">>,<<"0">>},
{<<"ep_oom_errors">>,<<"0">>},
{<<"ep_total_cache_size">>,<<"0">>},
{<<"ep_mem_high_wat">>,<<"2394685440">>},
{<<"ep_mem_low_wat">>,<<"1915748352">>},
{<<"ep_max_data_size">>,<<"3192913920">>},
{<<"ep_overhead">>,<<"25937168">>},
{<<"ep_kv_size">>,<<"0">>},
{<<"mem_used">>,<<"25937168">>},
{<<"curr_items_tot">>,<<"0">>},
{<<"curr_items">>,<<"0">>},
{<<"ep_flush_duration_highwat">>,<<"0">>},
{<<"ep_flush_duration_total">>,<<"0">>},
{<<"ep_flush_duration">>,<<"0">>},
{<<"ep_flush_preempts">>,<<"0">>},
{<<"ep_vbucket_del_fail">>,<<"0">>},
{<<"ep_vbucket_del">>,<<"0">>},
{<<"ep_commit_time_total">>,<<"0">>},
{<<"ep_commit_time">>,<<"0">>},
{<<"ep_commit_num">>,<<"0">>},
{<<"ep_flusher_state">>,<<"running">>},
{<<"ep_flusher_todo">>,<<"0">>},
{<<"ep_queue_size">>,<<"0">>},
{<<"ep_item_flush_expired">>,<<"0">>},
{<<"ep_expired">>,<<"0">>},
{<<"ep_item_commit_failed">>,<<"0">>},
{<<"ep_item_flush_failed">>,<<"0">>},
{<<"ep_total_persisted">>,<<"0">>},
{<<"ep_total_del_items">>,<<"0">>},
{<<"ep_total_new_items">>,<<"0">>},
{<<"ep_total_enqueued">>,<<"0">>},
{<<"ep_too_old">>,<<"0">>},
{<<"ep_too_young">>,<<"0">>},
{<<"ep_data_age_highwat">>,<<"0">>},
{<<"ep_data_age">>,<<"0">>},
{<<"ep_max_txn_size">>,<<"50000">>},
{<<"ep_queue_age_cap">>,<<"900">>},
{<<"ep_min_data_age">>,<<"0">>},
{<<"ep_storage_age_highwat">>,<<"0">>},
{<<"ep_storage_age">>,<<"0">>},
{<<"ep_num_not_my_vbuckets">>,<<"0">>},
{<<"ep_oom_errors">>,<<"0">>},
{<<"ep_tmp_oom_errors">>,<<"0">>},
{<<"ep_version">>,<<"1.6.0beta3a_166_g24a1637">>}],
TestGauges = [curr_connections,
curr_items,
ep_flusher_todo,
ep_queue_size,
mem_used],
TestCounters = [bytes_read,
bytes_written,
cas_badval,
cas_hits,
cas_misses,
cmd_get,
cmd_set,
decr_hits,
decr_misses,
delete_hits,
delete_misses,
get_hits,
get_misses,
incr_hits,
incr_misses,
ep_io_num_read,
ep_total_persisted,
ep_num_value_ejects,
ep_num_not_my_vbuckets,
ep_oom_errors,
ep_tmp_oom_errors],
ExpectedPropList = [{bytes_read,37610},
{bytes_written,823281},
{cas_badval,0},
{cas_hits,0},
{cas_misses,0},
{cmd_get,0},
{cmd_set,0},
{curr_connections,11},
{curr_items,0},
{decr_hits,0},
{decr_misses,0},
{delete_hits,0},
{delete_misses,0},
{ep_flusher_todo,0},
{ep_io_num_read,0},
{ep_num_not_my_vbuckets,0},
{ep_oom_errors,0},
{ep_queue_size,0},
{ep_tmp_oom_errors,0},
{ep_total_persisted,0},
{ep_num_value_ejects,5},
{get_hits,0},
{get_misses,0},
{incr_hits,0},
{incr_misses,0},
{mem_used,25937168}],
{ActualValues,
ActualCounters} = parse_stats_raw(
Now, Input,
lists:duplicate(length(TestCounters), 0),
Now - 1000,
TestGauges, TestCounters),
?assertEqual([37610,823281,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,0,0,0],
ActualCounters),
E = lists:keysort(1, ExpectedPropList),
A = lists:keysort(1, ActualValues),
?log_debug("Expected: ~p~nActual:~p", [E, A]),
true = (E == A).