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Optimise Khepri for concurrent reads (backport #14530) #14532

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Sep 12, 2025
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Optimise Khepri for concurrent reads (backport #14530) #14532

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26 changes: 15 additions & 11 deletions deps/rabbit/src/rabbit_khepri.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -1344,36 +1344,36 @@ register_rabbit_exchange_projection() ->
_VHost = ?KHEPRI_WILDCARD_STAR,
_Name = ?KHEPRI_WILDCARD_STAR),
KeyPos = #exchange.name,
register_simple_projection(Name, PathPattern, KeyPos).
register_simple_projection(Name, PathPattern, KeyPos, true).

register_rabbit_queue_projection() ->
Name = rabbit_khepri_queue,
PathPattern = rabbit_db_queue:khepri_queue_path(
_VHost = ?KHEPRI_WILDCARD_STAR,
_Name = ?KHEPRI_WILDCARD_STAR),
KeyPos = 2, %% #amqqueue.name
register_simple_projection(Name, PathPattern, KeyPos).
register_simple_projection(Name, PathPattern, KeyPos, true).

register_rabbit_vhost_projection() ->
Name = rabbit_khepri_vhost,
PathPattern = rabbit_db_vhost:khepri_vhost_path(
_VHost = ?KHEPRI_WILDCARD_STAR),
KeyPos = 2, %% #vhost.virtual_host
register_simple_projection(Name, PathPattern, KeyPos).
register_simple_projection(Name, PathPattern, KeyPos, false).

register_rabbit_users_projection() ->
Name = rabbit_khepri_user,
PathPattern = rabbit_db_user:khepri_user_path(
_UserName = ?KHEPRI_WILDCARD_STAR),
KeyPos = 2, %% #internal_user.username
register_simple_projection(Name, PathPattern, KeyPos).
register_simple_projection(Name, PathPattern, KeyPos, false).

register_rabbit_global_runtime_parameters_projection() ->
Name = rabbit_khepri_global_rtparam,
PathPattern = rabbit_db_rtparams:khepri_global_rp_path(
_Key = ?KHEPRI_WILDCARD_STAR_STAR),
KeyPos = #runtime_parameters.key,
register_simple_projection(Name, PathPattern, KeyPos).
register_simple_projection(Name, PathPattern, KeyPos, false).

register_rabbit_per_vhost_runtime_parameters_projection() ->
Name = rabbit_khepri_per_vhost_rtparam,
Expand All @@ -1382,18 +1382,19 @@ register_rabbit_per_vhost_runtime_parameters_projection() ->
_Component = ?KHEPRI_WILDCARD_STAR_STAR,
_Name = ?KHEPRI_WILDCARD_STAR_STAR),
KeyPos = #runtime_parameters.key,
register_simple_projection(Name, PathPattern, KeyPos).
register_simple_projection(Name, PathPattern, KeyPos, false).

register_rabbit_user_permissions_projection() ->
Name = rabbit_khepri_user_permission,
PathPattern = rabbit_db_user:khepri_user_permission_path(
_UserName = ?KHEPRI_WILDCARD_STAR,
_VHost = ?KHEPRI_WILDCARD_STAR),
KeyPos = #user_permission.user_vhost,
register_simple_projection(Name, PathPattern, KeyPos).
register_simple_projection(Name, PathPattern, KeyPos, false).

register_simple_projection(Name, PathPattern, KeyPos) ->
Options = #{keypos => KeyPos},
register_simple_projection(Name, PathPattern, KeyPos, ReadConcurrency) ->
Options = #{keypos => KeyPos,
read_concurrency => ReadConcurrency},
Projection = khepri_projection:new(Name, copy, Options),
khepri:register_projection(?STORE_ID, PathPattern, Projection).

Expand Down Expand Up @@ -1429,7 +1430,9 @@ register_rabbit_index_route_projection() ->
destination = Destination}
end,
ProjectionFun = projection_fun_for_sets(MapFun),
Options = #{type => bag, keypos => #index_route.source_key},
Options = #{type => bag,
keypos => #index_route.source_key,
read_concurrency => true},
Projection = khepri_projection:new(
rabbit_khepri_index_route, ProjectionFun, Options),
DirectOrFanout = #if_data_matches{
Expand Down Expand Up @@ -1497,7 +1500,8 @@ register_rabbit_topic_graph_projection() ->
end,
Options = #{keypos => #topic_trie_edge.trie_edge,
standalone_fun_options =>
#{should_process_function => ShouldProcessFun}},
#{should_process_function => ShouldProcessFun},
read_concurrency => true},
ProjectionFun =
fun(Table, Path, OldProps, NewProps) ->
{
Expand Down
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