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ra_server: Add a new last_applied state query #462

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merged 2 commits into from
Jul 26, 2024
Merged

ra_server: Add a new last_applied state query #462

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6aaaaf8
ra_server: Add a new `last_applied` state query
dumbbell Jul 25, 2024
c287738
ra_server_proc: Defer a call to `determine_leader/2` to where it's ne…
dumbbell Jul 25, 2024
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2 changes: 2 additions & 0 deletions src/ra_server.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -2445,6 +2445,8 @@ state_query(initial_members, #{log := Log}) ->
_ ->
error
end;
state_query(last_applied, State) ->
maps:get(last_applied, State, undefined);
state_query(Query, _State) ->
{error, {unknown_query, Query}}.

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4 changes: 2 additions & 2 deletions src/ra_server_proc.erl
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Expand Up @@ -1188,9 +1188,9 @@ perform_or_delay_local_query(
%% If the condition is set to `{applied, {Index, Term}}', the query is
%% added to a list of pending queries. It will be evaluated once that
%% index is applied locally.
Leader = determine_leader(RaftState, State),
case maps:get(condition, Options, undefined) of
undefined ->
Leader = determine_leader(RaftState, State),
Reply = perform_local_query(QueryFun, Leader, ServerState, Conf),
{keep_state, State, [{reply, From, Reply}]};
Condition ->
Expand All @@ -1207,7 +1207,7 @@ perform_or_delay_local_query(
perform_pending_queries(_RaftState, #state{pending_queries = []} = State) ->
{State, []};
perform_pending_queries(RaftState, State) ->
#{last_applied := LastApplied} = do_state_query(overview, State),
LastApplied = do_state_query(last_applied, State),
perform_pending_queries(RaftState, LastApplied, State, []).

perform_pending_queries(RaftState, LastApplied,
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