diff options
author | Simon MacMullen <simon@rabbitmq.com> | 2013-03-20 17:28:29 +0000 |
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committer | Simon MacMullen <simon@rabbitmq.com> | 2013-03-20 17:28:29 +0000 |
commit | b15b247899318309bc75840f2b37dde3f548d255 (patch) | |
tree | f43764194ab766fc3120c5d3d21372856d6bf416 | |
parent | e5a86b2fd17a316327975ce99bb9a6e81aadef37 (diff) | |
parent | 23e11ed50ee7fbb5406d349e0bb8c85696ea9611 (diff) | |
download | rabbitmq-server-b15b247899318309bc75840f2b37dde3f548d255.tar.gz |
First attempt at merging these two bugs; this compiles at least.
-rw-r--r-- | packaging/debs/apt-repository/distributions | 2 | ||||
-rw-r--r-- | src/rabbit_alarm.erl | 14 | ||||
-rw-r--r-- | src/rabbit_amqqueue.erl | 18 | ||||
-rw-r--r-- | src/rabbit_amqqueue_process.erl | 132 | ||||
-rw-r--r-- | src/rabbit_channel.erl | 50 | ||||
-rw-r--r-- | src/rabbit_limiter.erl | 84 | ||||
-rw-r--r-- | src/rabbit_misc.erl | 51 | ||||
-rw-r--r-- | src/rabbit_node_monitor.erl | 37 | ||||
-rw-r--r-- | src/rabbit_tests.erl | 24 |
9 files changed, 362 insertions, 50 deletions
diff --git a/packaging/debs/apt-repository/distributions b/packaging/debs/apt-repository/distributions index 61fd778a..75b9fe46 100644 --- a/packaging/debs/apt-repository/distributions +++ b/packaging/debs/apt-repository/distributions @@ -2,6 +2,6 @@ Origin: RabbitMQ Label: RabbitMQ Repository for Debian / Ubuntu etc Suite: testing Codename: kitten -Architectures: AVR32 alpha amd64 arm armel armhf hppa hurd-i386 i386 ia64 kfreebsd-amd64 kfreebsd-i386 m32 m68k mips mipsel netbsd-alpha netbsd-i386 powerpc s390 s390x sh sparc +Architectures: AVR32 alpha amd64 arm armel armhf hppa hurd-i386 i386 ia64 kfreebsd-amd64 kfreebsd-i386 m32 m68k mips mipsel netbsd-alpha netbsd-i386 powerpc s390 s390x sh sparc source Components: main Description: RabbitMQ Repository for Debian / Ubuntu etc diff --git a/src/rabbit_alarm.erl b/src/rabbit_alarm.erl index 362b11aa..6d24d130 100644 --- a/src/rabbit_alarm.erl +++ b/src/rabbit_alarm.erl @@ -208,11 +208,19 @@ internal_register(Pid, {M, F, A} = AlertMFA, State#alarms{alertees = NewAlertees}. handle_set_alarm({{resource_limit, Source, Node}, []}, State) -> - rabbit_log:warning("~s resource limit alarm set on node ~p~n", - [Source, Node]), + rabbit_log:warning( + "~s resource limit alarm set on node ~p.~n~n" + "**********************************************************~n" + "*** Publishers will be blocked until this alarm clears ***~n" + "**********************************************************~n", + [Source, Node]), {ok, maybe_alert(fun dict:append/3, Node, Source, State)}; handle_set_alarm({file_descriptor_limit, []}, State) -> - rabbit_log:warning("file descriptor limit alarm set~n"), + rabbit_log:warning( + "file descriptor limit alarm set.~n~n" + "********************************************************************~n" + "*** New connections will not be accepted until this alarm clears ***~n" + "********************************************************************~n"), {ok, State}; handle_set_alarm(Alarm, State) -> rabbit_log:warning("alarm '~p' set~n", [Alarm]), diff --git a/src/rabbit_amqqueue.erl b/src/rabbit_amqqueue.erl index 3f0a7f9c..2dfed21d 100644 --- a/src/rabbit_amqqueue.erl +++ b/src/rabbit_amqqueue.erl @@ -26,9 +26,9 @@ -export([list/0, list/1, info_keys/0, info/1, info/2, info_all/1, info_all/2]). -export([force_event_refresh/0, wake_up/1]). -export([consumers/1, consumers_all/1, consumer_info_keys/0]). --export([basic_get/4, basic_consume/8, basic_cancel/4]). +-export([basic_get/4, basic_consume/9, basic_cancel/4]). -export([notify_sent/2, notify_sent_queue_down/1, resume/2, flush_all/2]). --export([notify_down_all/2, activate_limit_all/2]). +-export([notify_down_all/2, activate_limit_all/2, credit/5]). -export([on_node_down/1]). -export([update/2, store_queue/1, policy_changed/2]). -export([start_mirroring/1, stop_mirroring/1, sync_mirrors/1, @@ -147,9 +147,11 @@ -spec(activate_limit_all/2 :: (qpids(), pid()) -> ok_or_errors()). -spec(basic_get/4 :: (rabbit_types:amqqueue(), pid(), boolean(), pid()) -> {'ok', non_neg_integer(), qmsg()} | 'empty'). --spec(basic_consume/8 :: +-spec(credit/5 :: (rabbit_types:amqqueue(), pid(), rabbit_types:ctag(), + non_neg_integer(), boolean()) -> 'ok'). +-spec(basic_consume/9 :: (rabbit_types:amqqueue(), boolean(), pid(), pid(), boolean(), - rabbit_types:ctag(), boolean(), any()) + rabbit_types:ctag(), boolean(), {non_neg_integer(), boolean()} | 'none', any()) -> rabbit_types:ok_or_error('exclusive_consume_unavailable')). -spec(basic_cancel/4 :: (rabbit_types:amqqueue(), pid(), rabbit_types:ctag(), any()) -> 'ok'). @@ -540,13 +542,17 @@ notify_down_all(QPids, ChPid) -> activate_limit_all(QPids, ChPid) -> delegate:cast(QPids, {activate_limit, ChPid}). +credit(#amqqueue{pid = QPid}, ChPid, CTag, Credit, Drain) -> + delegate:cast(QPid, {credit, ChPid, CTag, Credit, Drain}). + basic_get(#amqqueue{pid = QPid}, ChPid, NoAck, LimiterPid) -> delegate:call(QPid, {basic_get, ChPid, NoAck, LimiterPid}). + basic_consume(#amqqueue{pid = QPid}, NoAck, ChPid, LimiterPid, LimiterActive, - ConsumerTag, ExclusiveConsume, OkMsg) -> + ConsumerTag, ExclusiveConsume, CreditArgs, OkMsg) -> delegate:call(QPid, {basic_consume, NoAck, ChPid, LimiterPid, LimiterActive, - ConsumerTag, ExclusiveConsume, OkMsg}). + ConsumerTag, ExclusiveConsume, CreditArgs, OkMsg}). basic_cancel(#amqqueue{pid = QPid}, ChPid, ConsumerTag, OkMsg) -> delegate:call(QPid, {basic_cancel, ChPid, ConsumerTag, OkMsg}). diff --git a/src/rabbit_amqqueue_process.erl b/src/rabbit_amqqueue_process.erl index 6fc79dca..8f325e5c 100644 --- a/src/rabbit_amqqueue_process.erl +++ b/src/rabbit_amqqueue_process.erl @@ -66,8 +66,14 @@ monitor_ref, acktags, consumer_count, + %% Queue of {ChPid, #consumer{}} for consumers which have + %% been blocked for any reason blocked_consumers, + %% The limiter itself limiter, + %% Has the limiter imposed a channel-wide block, either + %% because of qos or channel flow? + %% Internal flow control for queue -> writer unsent_message_count}). %%---------------------------------------------------------------------------- @@ -404,6 +410,21 @@ block_consumer(C = #cr{blocked_consumers = Blocked}, QEntry) -> is_ch_blocked(#cr{unsent_message_count = Count, limiter = Limiter}) -> Count >= ?UNSENT_MESSAGE_LIMIT orelse rabbit_limiter:is_suspended(Limiter). +maybe_send_drained(WasEmpty, State) -> + case (not WasEmpty) andalso is_empty(State) of + true -> [send_drained(C) || C <- all_ch_record()]; + false -> ok + end, + State. + +send_drained(C = #cr{ch_pid = ChPid, limiter = Limiter}) -> + case rabbit_limiter:drained(Limiter) of + {[], Limiter} -> ok; + {CTagCredit, Limiter2} -> rabbit_channel:send_drained( + ChPid, CTagCredit), + update_ch_record(C#cr{limiter = Limiter2}) + end. + deliver_msgs_to_consumers(_DeliverFun, true, State) -> {true, State}; deliver_msgs_to_consumers(DeliverFun, false, @@ -424,14 +445,18 @@ deliver_msg_to_consumer(DeliverFun, E = {ChPid, Consumer}, State) -> true -> block_consumer(C, E), {false, State}; false -> case rabbit_limiter:can_send(C#cr.limiter, - Consumer#consumer.ack_required) of - {suspend, Limiter} -> - block_consumer(C#cr{limiter = Limiter}, E), + Consumer#consumer.ack_required, + Consumer#consumer.tag) of + consumer_blocked -> + block_consumer(C, E), {false, State}; - {continue, Limiter} -> + channel_blocked -> + block_consumer(C, E), + {false, State}; + Limiter2 -> AC1 = queue:in(E, State#q.active_consumers), deliver_msg_to_consumer( - DeliverFun, Consumer, C#cr{limiter = Limiter}, + DeliverFun, Consumer, C#cr{limiter = Limiter2}, State#q{active_consumers = AC1}) end end. @@ -583,14 +608,16 @@ maybe_drop_head(State = #q{max_length = MaxLen, requeue_and_run(AckTags, State = #q{backing_queue = BQ, backing_queue_state = BQS}) -> + WasEmpty = BQ:is_empty(BQS), {_MsgIds, BQS1} = BQ:requeue(AckTags, BQS), {_Dropped, State1} = maybe_drop_head(State#q{backing_queue_state = BQS1}), - run_message_queue(drop_expired_msgs(State1)). + run_message_queue(maybe_send_drained(WasEmpty, drop_expired_msgs(State1))). fetch(AckRequired, State = #q{backing_queue = BQ, backing_queue_state = BQS}) -> {Result, BQS1} = BQ:fetch(AckRequired, BQS), - {Result, drop_expired_msgs(State#q{backing_queue_state = BQS1})}. + State1 = drop_expired_msgs(State#q{backing_queue_state = BQS1}), + {Result, maybe_send_drained(Result =:= empty, State1)}. ack(AckTags, ChPid, State) -> subtract_acks(ChPid, AckTags, State, @@ -619,20 +646,29 @@ remove_consumers(ChPid, Queue, QName) -> possibly_unblock(State, ChPid, Update) -> case lookup_ch(ChPid) of - not_found -> - State; - C -> - C1 = Update(C), - case is_ch_blocked(C) andalso not is_ch_blocked(C1) of - false -> update_ch_record(C1), + not_found -> State; + C -> possibly_unblock(State, Update(C)) + end. + +possibly_unblock(State, C = #cr{limiter = Limiter}) -> + case is_ch_blocked(C) of + true -> update_ch_record(C), + State; + false -> case lists:partition( + fun({_ChPid, #consumer{tag = CTag}}) -> + rabbit_limiter:is_consumer_blocked( + Limiter, CTag) + end, queue:to_list(C#cr.blocked_consumers)) of + {_, []} -> + update_ch_record(C), State; - true -> #cr{blocked_consumers = Consumers} = C1, - update_ch_record( - C1#cr{blocked_consumers = queue:new()}), - AC1 = queue:join(State#q.active_consumers, - Consumers), + {Blocked, Unblocked} -> + BlockedQ = queue:from_list(Blocked), + UnblockedQ = queue:from_list(Unblocked), + update_ch_record(C#cr{blocked_consumers = BlockedQ}), + AC1 = queue:join(State#q.active_consumers, UnblockedQ), run_message_queue(State#q{active_consumers = AC1}) - end + end end. should_auto_delete(#q{q = #amqqueue{auto_delete = false}}) -> false; @@ -729,6 +765,11 @@ calculate_msg_expiry(#basic_message{content = Content}, TTL) -> T -> now_micros() + T * 1000 end. +%% Logically this function should invoke maybe_send_drained/2. +%% However, that is expensive. Since some frequent callers of +%% drop_expired_msgs/1, in particular deliver_or_enqueue/3, cannot +%% possibly cause the queue to become empty, we push the +%% responsibility to the callers. So be cautious when adding new ones. drop_expired_msgs(State) -> case is_empty(State) of true -> State; @@ -1111,7 +1152,7 @@ handle_call({basic_get, ChPid, NoAck, LimiterPid}, _From, end; handle_call({basic_consume, NoAck, ChPid, LimiterPid, LimiterActive, - ConsumerTag, ExclusiveConsume, OkMsg}, + ConsumerTag, ExclusiveConsume, CreditArgs, OkMsg}, _From, State = #q{exclusive_consumer = Holder}) -> case check_exclusive_access(Holder, ExclusiveConsume, State) of in_use -> @@ -1119,12 +1160,23 @@ handle_call({basic_consume, NoAck, ChPid, LimiterPid, LimiterActive, ok -> C = #cr{consumer_count = Count, limiter = Limiter} = ch_record(ChPid, LimiterPid), - Limiter1 = case LimiterActive of - true -> rabbit_limiter:activate(Limiter); - false -> Limiter + Limiter1 = case CreditArgs of + none -> + Limiter; + {Credit, Drain} -> + rabbit_limiter:credit( + Limiter, ConsumerTag, Credit, Drain) + end, + Limiter2 = case LimiterActive of + true -> rabbit_limiter:activate(Limiter1); + false -> Limiter1 end, - update_ch_record(C#cr{consumer_count = Count + 1, - limiter = Limiter1}), + C1 = update_ch_record(C#cr{consumer_count = Count + 1, + limiter = Limiter2}), + case is_empty(State) of + true -> send_drained(C1); + false -> ok + end, Consumer = #consumer{tag = ConsumerTag, ack_required = not NoAck}, ExclusiveConsumer = if ExclusiveConsume -> {ChPid, ConsumerTag}; @@ -1149,13 +1201,14 @@ handle_call({basic_cancel, ChPid, ConsumerTag, OkMsg}, From, limiter = Limiter, blocked_consumers = Blocked} -> emit_consumer_deleted(ChPid, ConsumerTag, qname(State)), + Limiter1 = rabbit_limiter:forget_consumer(Limiter, ConsumerTag), Blocked1 = remove_consumer(ChPid, ConsumerTag, Blocked), - Limiter1 = case Count of - 1 -> rabbit_limiter:deactivate(Limiter); - _ -> Limiter + Limiter2 = case Count of + 1 -> rabbit_limiter:deactivate(Limiter1); + _ -> Limiter1 end, update_ch_record(C#cr{consumer_count = Count - 1, - limiter = Limiter1, + limiter = Limiter2, blocked_consumers = Blocked1}), State1 = State#q{ exclusive_consumer = case Holder of @@ -1189,7 +1242,8 @@ handle_call({delete, IfUnused, IfEmpty}, From, handle_call(purge, _From, State = #q{backing_queue = BQ, backing_queue_state = BQS}) -> {Count, BQS1} = BQ:purge(BQS), - reply({ok, Count}, State#q{backing_queue_state = BQS1}); + State1 = State#q{backing_queue_state = BQS1}, + reply({ok, Count}, maybe_send_drained(Count =:= 0, State1)); handle_call({requeue, AckTags, ChPid}, From, State) -> gen_server2:reply(From, ok), @@ -1335,6 +1389,20 @@ handle_cast(stop_mirroring, State = #q{backing_queue = BQ, noreply(State#q{backing_queue = BQ1, backing_queue_state = BQS1}); +handle_cast({credit, ChPid, CTag, Credit, Drain}, + State = #q{backing_queue = BQ, + backing_queue_state = BQS}) -> + Len = BQ:len(BQS), + rabbit_channel:send_credit_reply(ChPid, Len), + C = #cr{limiter = Lim} = lookup_ch(ChPid), + C1 = C#cr{limiter = rabbit_limiter:credit(Lim, CTag, Credit, Drain)}, + noreply(case Drain andalso Len == 0 of + true -> update_ch_record(C1), + send_drained(C1), + State; + false -> possibly_unblock(State, C1) + end); + handle_cast(wake_up, State) -> noreply(State). @@ -1354,7 +1422,9 @@ handle_info(maybe_expire, State) -> end; handle_info(drop_expired, State) -> - noreply(drop_expired_msgs(State#q{ttl_timer_ref = undefined})); + WasEmpty = is_empty(State), + State1 = drop_expired_msgs(State#q{ttl_timer_ref = undefined}), + noreply(maybe_send_drained(WasEmpty, State1)); handle_info(emit_stats, State) -> emit_stats(State), diff --git a/src/rabbit_channel.erl b/src/rabbit_channel.erl index 1787d688..5af112e2 100644 --- a/src/rabbit_channel.erl +++ b/src/rabbit_channel.erl @@ -21,7 +21,8 @@ -behaviour(gen_server2). -export([start_link/11, do/2, do/3, do_flow/3, flush/1, shutdown/1]). --export([send_command/2, deliver/4, flushed/2]). +-export([send_command/2, deliver/4, send_credit_reply/2, send_drained/2, + flushed/2]). -export([list/0, info_keys/0, info/1, info/2, info_all/0, info_all/1]). -export([refresh_config_local/0, ready_for_close/1]). -export([force_event_refresh/0]). @@ -94,6 +95,9 @@ -spec(deliver/4 :: (pid(), rabbit_types:ctag(), boolean(), rabbit_amqqueue:qmsg()) -> 'ok'). +-spec(send_credit_reply/2 :: (pid(), non_neg_integer()) -> 'ok'). +-spec(send_drained/2 :: (pid(), [{rabbit_types:ctag(), non_neg_integer()}]) + -> 'ok'). -spec(flushed/2 :: (pid(), pid()) -> 'ok'). -spec(list/0 :: () -> [pid()]). -spec(list_local/0 :: () -> [pid()]). @@ -138,6 +142,12 @@ send_command(Pid, Msg) -> deliver(Pid, ConsumerTag, AckRequired, Msg) -> gen_server2:cast(Pid, {deliver, ConsumerTag, AckRequired, Msg}). +send_credit_reply(Pid, Len) -> + gen_server2:cast(Pid, {send_credit_reply, Len}). + +send_drained(Pid, CTagCredit) -> + gen_server2:cast(Pid, {send_drained, CTagCredit}). + flushed(Pid, QPid) -> gen_server2:cast(Pid, {flushed, QPid}). @@ -315,6 +325,19 @@ handle_cast({deliver, ConsumerTag, AckRequired, Content), noreply(record_sent(ConsumerTag, AckRequired, Msg, State)); +handle_cast({send_credit_reply, Len}, State = #ch{writer_pid = WriterPid}) -> + ok = rabbit_writer:send_command( + WriterPid, #'basic.credit_ok'{available = Len}), + noreply(State); + +handle_cast({send_drained, CTagCredit}, + State = #ch{writer_pid = WriterPid}) -> + [ok = rabbit_writer:send_command( + WriterPid, #'basic.credit_drained'{consumer_tag = ConsumerTag, + credit_drained = CreditDrained}) + || {ConsumerTag, CreditDrained} <- CTagCredit], + noreply(State); + handle_cast(force_event_refresh, State) -> rabbit_event:notify(channel_created, infos(?CREATION_EVENT_KEYS, State)), noreply(State); @@ -709,7 +732,8 @@ handle_method(#'basic.consume'{queue = QueueNameBin, no_local = _, % FIXME: implement no_ack = NoAck, exclusive = ExclusiveConsume, - nowait = NoWait}, + nowait = NoWait, + arguments = Arguments}, _, State = #ch{conn_pid = ConnPid, limiter = Limiter, consumer_mapping = ConsumerMapping}) -> @@ -735,6 +759,7 @@ handle_method(#'basic.consume'{queue = QueueNameBin, rabbit_limiter:pid(Limiter), rabbit_limiter:is_active(Limiter), ActualConsumerTag, ExclusiveConsume, + parse_credit_args(Arguments), ok_msg(NoWait, #'basic.consume_ok'{ consumer_tag = ActualConsumerTag})), Q} @@ -1110,6 +1135,17 @@ handle_method(#'channel.flow'{active = false}, _, State1#ch{blocking = sets:from_list(QPids)})} end; +handle_method(#'basic.credit'{consumer_tag = CTag, + credit = Credit, + drain = Drain}, _, + State = #ch{consumer_mapping = Consumers}) -> + case dict:find(CTag, Consumers) of + {ok, Q} -> ok = rabbit_amqqueue:credit( + Q, self(), CTag, Credit, Drain), + {noreply, State}; + error -> precondition_failed("unknown consumer tag '~s'", [CTag]) + end; + handle_method(_MethodRecord, _Content, _State) -> rabbit_misc:protocol_error( command_invalid, "unimplemented method", []). @@ -1176,6 +1212,16 @@ handle_consuming_queue_down(QPid, handle_delivering_queue_down(QPid, State = #ch{delivering_queues = DQ}) -> State#ch{delivering_queues = sets:del_element(QPid, DQ)}. +parse_credit_args(Arguments) -> + case rabbit_misc:table_lookup(Arguments, <<"x-credit">>) of + {table, T} -> case {rabbit_misc:table_lookup(T, <<"credit">>), + rabbit_misc:table_lookup(T, <<"drain">>)} of + {{long, Credit}, {boolean, Drain}} -> {Credit, Drain}; + _ -> none + end; + undefined -> none + end. + binding_action(Fun, ExchangeNameBin, DestinationType, DestinationNameBin, RoutingKey, Arguments, ReturnMethod, NoWait, State = #ch{virtual_host = VHostPath, diff --git a/src/rabbit_limiter.erl b/src/rabbit_limiter.erl index 430c2716..71ed2e73 100644 --- a/src/rabbit_limiter.erl +++ b/src/rabbit_limiter.erl @@ -117,10 +117,14 @@ -export([init/1, terminate/2, code_change/3, handle_call/3, handle_cast/2, handle_info/2, prioritise_call/3]). +-export([is_consumer_blocked/2, credit/4, drained/1, forget_consumer/2]). + +-import(rabbit_misc, [serial_add/2, serial_diff/2]). + %%---------------------------------------------------------------------------- -record(lstate, {pid, prefetch_limited, blocked}). --record(qstate, {pid, state}). +-record(qstate, {pid, state, credits}). -ifdef(use_specs). @@ -137,6 +141,8 @@ -> lstate()). -spec(unlimit_prefetch/1 :: (lstate()) -> lstate()). -spec(block/1 :: (lstate()) -> lstate()). +-spec(can_send/4 :: (qstate(), pid(), boolean(), rabbit_types:ctag()) + -> qstate() | 'consumer_blocked' | 'channel_blocked'). -spec(unblock/1 :: (lstate()) -> lstate()). -spec(is_prefetch_limited/1 :: (lstate()) -> boolean()). -spec(is_blocked/1 :: (lstate()) -> boolean()). @@ -152,6 +158,12 @@ -spec(resume/1 :: (qstate()) -> qstate()). -spec(deactivate/1 :: (qstate()) -> qstate()). -spec(is_suspended/1 :: (qstate()) -> boolean()). +-spec(is_consumer_blocked/2 :: (qstate(), rabbit_types:ctag()) -> boolean()). +-spec(credit/4 :: (qstate(), rabbit_types:ctag(), non_neg_integer(), boolean()) + -> qstate()). +-spec(drained/1 :: (qstate()) + -> {[{rabbit_types:ctag(), non_neg_integer()}], qstate()}). +-spec(forget_consumer/2 :: (qstate(), rabbit_types:ctag()) -> qstate()). -endif. @@ -166,6 +178,8 @@ %% notified of a change in the limit or volume that may allow it to %% deliver more messages via the limiter's channel. +-record(credit, {credit = 0, drain = false}). + %%---------------------------------------------------------------------------- %% API %%---------------------------------------------------------------------------- @@ -196,6 +210,24 @@ unblock(L) -> is_prefetch_limited(#lstate{prefetch_limited = Limited}) -> Limited. +can_send(Token = #qstate{pid = Pid, state = State, credits = Credits}, + QPid, AckReq, CTag) -> + case is_consumer_blocked(Token, CTag) of + false -> case State =/= active orelse call_can_send(Pid, QPid, AckReq) of + true -> Token#qstate{ + credits = record_send_q(CTag, Credits)}; + false -> channel_blocked + end; + true -> consumer_blocked + end. + +call_can_send(Pid, QPid, AckRequired) -> + rabbit_misc:with_exit_handler( + fun () -> true end, + fun () -> + gen_server2:call(Pid, {can_send, QPid, AckRequired}, infinity) + end). + is_blocked(#lstate{blocked = Blocked}) -> Blocked. is_active(L) -> is_prefetch_limited(L) orelse is_blocked(L). @@ -208,7 +240,7 @@ ack(L, AckCount) -> gen_server:cast(L#lstate.pid, {ack, AckCount}). pid(#lstate{pid = Pid}) -> Pid. -client(Pid) -> #qstate{pid = Pid, state = dormant}. +client(Pid) -> #qstate{pid = Pid, state = dormant, credits = gb_trees:empty()}. activate(L = #qstate{state = dormant}) -> ok = gen_server:cast(L#qstate.pid, {register, self()}), @@ -236,6 +268,54 @@ deactivate(L) -> is_suspended(#qstate{state = suspended}) -> true; is_suspended(#qstate{}) -> false. +is_consumer_blocked(#qstate{credits = Credits}, CTag) -> + case gb_trees:lookup(CTag, Credits) of + {value, #credit{credit = C}} when C > 0 -> false; + {value, #credit{}} -> true; + none -> false + end. + + +credit(Limiter = #qstate{credits = Credits}, CTag, Credit, Drain) -> + Limiter#qstate{credits = update_credit(CTag, Credit, Drain, Credits)}. + +drained(Limiter = #qstate{credits = Credits}) -> + {CTagCredits, Credits2} = + rabbit_misc:gb_trees_fold( + fun (CTag, #credit{credit = C, drain = true}, {Acc, Creds0}) -> + {[{CTag, C} | Acc], update_credit(CTag, 0, false, Creds0)}; + (_CTag, #credit{credit = _C, drain = false}, {Acc, Creds0}) -> + {Acc, Creds0} + end, {[], Credits}, Credits), + {CTagCredits, Limiter#qstate{credits = Credits2}}. + +forget_consumer(Limiter = #qstate{credits = Credits}, CTag) -> + Limiter#qstate{credits = gb_trees:delete_any(CTag, Credits)}. + +%%---------------------------------------------------------------------------- +%% Queue-local code +%%---------------------------------------------------------------------------- + +%% We want to do all the AMQP 1.0-ish link level credit calculations +%% in the queue (to do them elsewhere introduces a ton of +%% races). However, it's a big chunk of code that is conceptually very +%% linked to the limiter concept. So we get the queue to hold a bit of +%% state for us (#qstate.credits), and maintain a fiction that the +%% limiter is making the decisions... + +record_send_q(CTag, Credits) -> + case gb_trees:lookup(CTag, Credits) of + {value, #credit{credit = Credit, drain = Drain}} -> + update_credit(CTag, Credit - 1, Drain, Credits); + none -> + Credits + end. + +update_credit(CTag, Credit, Drain, Credits) -> + %% Using up all credit implies no need to send a 'drained' event + Drain1 = Drain andalso Credit > 0, + gb_trees:enter(CTag, #credit{credit = Credit, drain = Drain1}, Credits). + %%---------------------------------------------------------------------------- %% gen_server callbacks %%---------------------------------------------------------------------------- diff --git a/src/rabbit_misc.erl b/src/rabbit_misc.erl index c36fb147..135f6443 100644 --- a/src/rabbit_misc.erl +++ b/src/rabbit_misc.erl @@ -69,6 +69,7 @@ -export([interval_operation/4]). -export([ensure_timer/4, stop_timer/2]). -export([get_parent/0]). +-export([serial_add/2, serial_compare/2, serial_diff/2]). %% Horrible macro to use in guards -define(IS_BENIGN_EXIT(R), @@ -83,6 +84,7 @@ -ifdef(use_specs). -export_type([resource_name/0, thunk/1]). +-export_type([serial_number/0]). -type(ok_or_error() :: rabbit_types:ok_or_error(any())). -type(thunk(T) :: fun(() -> T)). @@ -95,6 +97,8 @@ fun ((atom(), [term()]) -> [{digraph:vertex(), digraph_label()}])). -type(graph_edge_fun() :: fun ((atom(), [term()]) -> [{digraph:vertex(), digraph:vertex()}])). +-type(serial_number() :: non_neg_integer()). +-type(serial_compare_result() :: 'equal' | 'less' | 'greater'). -spec(method_record_type/1 :: (rabbit_framing:amqp_method_record()) -> rabbit_framing:amqp_method_name()). @@ -246,6 +250,12 @@ -spec(ensure_timer/4 :: (A, non_neg_integer(), non_neg_integer(), any()) -> A). -spec(stop_timer/2 :: (A, non_neg_integer()) -> A). -spec(get_parent/0 :: () -> pid()). +-spec(serial_add/2 :: (serial_number(), non_neg_integer()) -> + serial_number()). +-spec(serial_compare/2 :: (serial_number(), serial_number()) -> + serial_compare_result()). +-spec(serial_diff/2 :: (serial_number(), serial_number()) -> + integer()). -endif. %%---------------------------------------------------------------------------- @@ -1099,3 +1109,44 @@ whereis_name(Name) -> %% End copypasta from gen_server2.erl %% ------------------------------------------------------------------------- + +%% Serial arithmetic for unsigned ints. +%% http://www.faqs.org/rfcs/rfc1982.html +%% SERIAL_BITS = 32 + +%% 2 ^ SERIAL_BITS +-define(SERIAL_MAX, 16#100000000). +%% 2 ^ (SERIAL_BITS - 1) - 1 +-define(SERIAL_MAX_ADDEND, 16#7fffffff). + +serial_add(S, N) when N =< ?SERIAL_MAX_ADDEND -> + (S + N) rem ?SERIAL_MAX; +serial_add(S, N) -> + exit({out_of_bound_serial_addition, S, N}). + +serial_compare(A, B) -> + if A =:= B -> + equal; + (A < B andalso B - A < ?SERIAL_MAX_ADDEND) orelse + (A > B andalso A - B > ?SERIAL_MAX_ADDEND) -> + less; + (A < B andalso B - A > ?SERIAL_MAX_ADDEND) orelse + (A > B andalso B - A < ?SERIAL_MAX_ADDEND) -> + greater; + true -> exit({indeterminate_serial_comparison, A, B}) + end. + +-define(SERIAL_DIFF_BOUND, 16#80000000). + +serial_diff(A, B) -> + Diff = A - B, + if Diff > (?SERIAL_DIFF_BOUND) -> + %% B is actually greater than A + - (?SERIAL_MAX - Diff); + Diff < - (?SERIAL_DIFF_BOUND) -> + ?SERIAL_MAX + Diff; + Diff < ?SERIAL_DIFF_BOUND andalso Diff > -?SERIAL_DIFF_BOUND -> + Diff; + true -> + exit({indeterminate_serial_diff, A, B}) + end. diff --git a/src/rabbit_node_monitor.erl b/src/rabbit_node_monitor.erl index 98e26a6a..de53b7f0 100644 --- a/src/rabbit_node_monitor.erl +++ b/src/rabbit_node_monitor.erl @@ -249,7 +249,8 @@ handle_info({'DOWN', _MRef, process, {rabbit, Node}, _Reason}, write_cluster_status({AllNodes, DiscNodes, del_node(Node, RunningNodes)}), ok = handle_dead_rabbit(Node), [P ! {node_down, Node} || P <- pmon:monitored(Subscribers)], - {noreply, State#state{monitors = pmon:erase({rabbit, Node}, Monitors)}}; + {noreply, handle_dead_rabbit_state( + State#state{monitors = pmon:erase({rabbit, Node}, Monitors)})}; handle_info({'DOWN', _MRef, process, Pid, _Reason}, State = #state{subscribers = Subscribers}) -> @@ -257,10 +258,19 @@ handle_info({'DOWN', _MRef, process, Pid, _Reason}, handle_info({mnesia_system_event, {inconsistent_database, running_partitioned_network, Node}}, - State = #state{partitions = Partitions}) -> + State = #state{partitions = Partitions, + monitors = Monitors}) -> + %% We will not get a node_up from this node - yet we should treat it as + %% up (mostly). + State1 = case pmon:is_monitored({rabbit, Node}, Monitors) of + true -> State; + false -> State#state{ + monitors = pmon:monitor({rabbit, Node}, Monitors)} + end, + ok = handle_live_rabbit(Node), Partitions1 = ordsets:to_list( ordsets:add_element(Node, ordsets:from_list(Partitions))), - {noreply, State#state{partitions = Partitions1}}; + {noreply, State1#state{partitions = Partitions1}}; handle_info(_Info, State) -> {noreply, State}. @@ -299,9 +309,14 @@ handle_dead_rabbit(Node) -> ok. majority() -> + length(alive_nodes()) / length(rabbit_mnesia:cluster_nodes(all)) > 0.5. + +%% mnesia:system_info(db_nodes) (and hence +%% rabbit_mnesia:cluster_nodes(running)) does not give reliable results +%% when partitioned. +alive_nodes() -> Nodes = rabbit_mnesia:cluster_nodes(all), - Alive = [N || N <- Nodes, pong =:= net_adm:ping(N)], - length(Alive) / length(Nodes) > 0.5. + [N || N <- Nodes, pong =:= net_adm:ping(N)]. await_cluster_recovery() -> rabbit_log:warning("Cluster minority status detected - awaiting recovery~n", @@ -325,6 +340,18 @@ wait_for_cluster_recovery(Nodes) -> wait_for_cluster_recovery(Nodes) end. +handle_dead_rabbit_state(State = #state{partitions = Partitions}) -> + %% If we have been partitioned, and we are now in the only remaining + %% partition, we no longer care about partitions - forget them. Note + %% that we do not attempt to deal with individual (other) partitions + %% going away. It's only safe to forget anything about partitions when + %% there are no partitions. + Partitions1 = case Partitions -- (Partitions -- alive_nodes()) of + [] -> []; + _ -> Partitions + end, + State#state{partitions = Partitions1}. + handle_live_rabbit(Node) -> ok = rabbit_alarm:on_node_up(Node), ok = rabbit_mnesia:on_node_up(Node). diff --git a/src/rabbit_tests.erl b/src/rabbit_tests.erl index d1ae38be..f56fe8ee 100644 --- a/src/rabbit_tests.erl +++ b/src/rabbit_tests.erl @@ -50,6 +50,7 @@ all_tests() -> passed = test_table_codec(), passed = test_content_framing(), passed = test_content_transcoding(), + passed = test_serial_arithmetic(), passed = test_topic_matching(), passed = test_log_management(), passed = test_app_management(), @@ -559,6 +560,29 @@ sequence_with_content(Sequence) -> rabbit_framing_amqp_0_9_1), Sequence). +test_serial_arithmetic() -> + 1 = rabbit_misc:serial_add(0, 1), + 16#7fffffff = rabbit_misc:serial_add(0, 16#7fffffff), + 0 = rabbit_misc:serial_add(16#ffffffff, 1), + %% Cannot add more than 2 ^ 31 - 1 + case catch rabbit_misc:serial_add(200, 16#80000000) of + {'EXIT', {out_of_bound_serial_addition, _, _}} -> ok; + _ -> exit(fail_out_of_bound_serial_addition) + end, + + 1 = rabbit_misc:serial_diff(1, 0), + 2 = rabbit_misc:serial_diff(1, 16#ffffffff), + -2 = rabbit_misc:serial_diff(16#ffffffff, 1), + case catch rabbit_misc:serial_diff(0, 16#80000000) of + {'EXIT', {indeterminate_serial_diff, _, _}} -> ok; + _ -> exit(fail_indeterminate_serial_difference) + end, + case catch rabbit_misc:serial_diff(16#ffffffff, 16#7fffffff) of + {'EXIT', {indeterminate_serial_diff, _, _}} -> ok; + _ -> exit(fail_indeterminate_serial_difference) + end, + passed. + test_topic_matching() -> XName = #resource{virtual_host = <<"/">>, kind = exchange, |