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Merged
merged 4 commits into from
Dec 27, 2023
Merged

QQ: Avoid secondary process when repairing leader record. #10193

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0feaaab
QQ: Avoid secondary process when repairing leader record.
kjnilsson Dec 20, 2023
78fd5d8
QQ: wait for projections before starting Ra cluster
kjnilsson Dec 21, 2023
f1485c4
dialyzer
kjnilsson Dec 21, 2023
ac6690f
Fix dialyzer complaint
dcorbacho Dec 27, 2023
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77 changes: 52 additions & 25 deletions deps/rabbit/src/rabbit_quorum_queue.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -230,18 +230,23 @@ start_cluster(Q) ->
{error, {too_long, N}} ->
rabbit_data_coercion:to_atom(ra:new_uid(N))
end,
{Leader, Followers} = rabbit_queue_location:select_leader_and_followers(Q, QuorumSize),
LeaderId = {RaName, Leader},
{LeaderNode, FollowerNodes} =
rabbit_queue_location:select_leader_and_followers(Q, QuorumSize),
LeaderId = {RaName, LeaderNode},
NewQ0 = amqqueue:set_pid(Q, LeaderId),
NewQ1 = amqqueue:set_type_state(NewQ0, #{nodes => [Leader | Followers]}),
NewQ1 = amqqueue:set_type_state(NewQ0,
#{nodes => [LeaderNode | FollowerNodes]}),

rabbit_log:debug("Will start up to ~w replicas for quorum ~ts with leader on node '~ts'",
[QuorumSize, rabbit_misc:rs(QName), Leader]),
[QuorumSize, rabbit_misc:rs(QName), LeaderNode]),
case rabbit_amqqueue:internal_declare(NewQ1, false) of
{created, NewQ} ->
RaConfs = [make_ra_conf(NewQ, ServerId)
|| ServerId <- members(NewQ)],
try erpc_call(Leader, ra, start_cluster,

%% khepri projections on remote nodes are eventually consistent
wait_for_projections(LeaderNode, QName),
try erpc_call(LeaderNode, ra, start_cluster,
[?RA_SYSTEM, RaConfs, ?START_CLUSTER_TIMEOUT],
?START_CLUSTER_RPC_TIMEOUT) of
{ok, _, _} ->
Expand All @@ -266,10 +271,10 @@ start_cluster(Q) ->
ActingUser}]),
{new, NewQ};
{error, Error} ->
declare_queue_error(Error, NewQ, Leader, ActingUser)
declare_queue_error(Error, NewQ, LeaderNode, ActingUser)
catch
error:Error ->
declare_queue_error(Error, NewQ, Leader, ActingUser)
declare_queue_error(Error, NewQ, LeaderNode, ActingUser)
end;
{existing, _} = Ex ->
Ex
Expand Down Expand Up @@ -359,26 +364,28 @@ local_or_remote_handler(ChPid, Module, Function, Args) ->
end.

become_leader(QName, Name) ->
%% as this function is called synchronously when a ra node becomes leader
%% we need to ensure there is no chance of blocking as else the ra node
%% may not be able to establish its leadership
spawn(fun () -> become_leader0(QName, Name) end).

become_leader0(QName, Name) ->
Fun = fun (Q1) ->
amqqueue:set_state(
amqqueue:set_pid(Q1, {Name, node()}),
live)
end,
%% as this function is called synchronously when a ra node becomes leader
%% we need to ensure there is no chance of blocking as else the ra node
%% may not be able to establish its leadership
spawn(fun() ->
_ = rabbit_amqqueue:update(QName, Fun),
case rabbit_amqqueue:lookup(QName) of
{ok, Q0} when ?is_amqqueue(Q0) ->
Nodes = get_nodes(Q0),
[_ = erpc_call(Node, ?MODULE, rpc_delete_metrics,
[QName], ?RPC_TIMEOUT)
|| Node <- Nodes, Node =/= node()];
_ ->
ok
end
end).
_ = rabbit_amqqueue:update(QName, Fun),
case rabbit_amqqueue:lookup(QName) of
{ok, Q0} when ?is_amqqueue(Q0) ->
Nodes = get_nodes(Q0),
_ = [_ = erpc_call(Node, ?MODULE, rpc_delete_metrics,
[QName], ?RPC_TIMEOUT)
|| Node <- Nodes, Node =/= node()],
ok;
_ ->
ok
end.

-spec all_replica_states() -> {node(), #{atom() => atom()}}.
all_replica_states() ->
Expand Down Expand Up @@ -550,7 +557,7 @@ handle_tick(QName,
catch
_:Err ->
rabbit_log:debug("~ts: handle tick failed with ~p",
[rabbit_misc:rs(QName), Err]),
[rabbit_misc:rs(QName), Err]),
ok
end
end).
Expand All @@ -566,7 +573,7 @@ repair_leader_record(QName, Self) ->
rabbit_log:debug("~ts: repairing leader record",
[rabbit_misc:rs(QName)]),
{_, Name} = erlang:process_info(Self, registered_name),
become_leader(QName, Name),
ok = become_leader0(QName, Name),
ok
end,
ok.
Expand Down Expand Up @@ -633,7 +640,7 @@ recover(_Vhost, Queues) ->
Err1 == name_not_registered ->
rabbit_log:warning("Quorum queue recovery: configured member of ~ts was not found on this node. Starting member as a new one. "
"Context: ~s",
[rabbit_misc:rs(QName), Err1]),
[rabbit_misc:rs(QName), Err1]),
% queue was never started on this node
% so needs to be started from scratch.
case start_server(make_ra_conf(Q0, ServerId)) of
Expand Down Expand Up @@ -1901,3 +1908,23 @@ force_all_queues_shrink_member_to_current_member() ->
is_minority(All, Up) ->
MinQuorum = length(All) div 2 + 1,
length(Up) < MinQuorum.

wait_for_projections(Node, QName) ->
case rabbit_feature_flags:is_enabled(khepri_db) andalso
Node =/= node() of
true ->
wait_for_projections(Node, QName, 256);
false ->
ok
end.

wait_for_projections(Node, QName, 0) ->
exit({wait_for_projections_timed_out, Node, QName});
wait_for_projections(Node, QName, N) ->
case erpc_call(Node, rabbit_amqqueue, lookup, [QName], 100) of
{ok, _} ->
ok;
_ ->
timer:sleep(100),
wait_for_projections(Node, QName, N - 1)
end.
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