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-rw-r--r--lib/mnesia/src/mnesia_tm.erl74
1 files changed, 62 insertions, 12 deletions
diff --git a/lib/mnesia/src/mnesia_tm.erl b/lib/mnesia/src/mnesia_tm.erl
index d42109c3da..f62f7cb7c8 100644
--- a/lib/mnesia/src/mnesia_tm.erl
+++ b/lib/mnesia/src/mnesia_tm.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1996-2010. All Rights Reserved.
+%% Copyright Ericsson AB 1996-2011. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
@@ -64,7 +64,8 @@
prev_tab = [], % initiate to a non valid table name
prev_types,
prev_snmp,
- types
+ types,
+ majority = []
}).
-record(participant, {tid, pid, commit, disc_nodes = [],
@@ -1100,9 +1101,12 @@ t_commit(Type) ->
case arrange(Tid, Store, Type) of
{N, Prep} when N > 0 ->
multi_commit(Prep#prep.protocol,
+ majority_attr(Prep),
Tid, Prep#prep.records, Store);
{0, Prep} ->
- multi_commit(read_only, Tid, Prep#prep.records, Store)
+ multi_commit(read_only,
+ majority_attr(Prep),
+ Tid, Prep#prep.records, Store)
end;
true ->
%% nested commit
@@ -1117,6 +1121,10 @@ t_commit(Type) ->
do_commit_nested
end.
+majority_attr(#prep{majority = M}) ->
+ M.
+
+
%% This function arranges for all objects we shall write in S to be
%% in a list of {Node, CommitRecord}
%% Important function for the performance of mnesia.
@@ -1222,11 +1230,13 @@ prepare_items(Tid, Tab, Key, Items, Prep) ->
{blocked, _} ->
unblocked = req({unblock_me, Tab}),
prepare_items(Tid, Tab, Key, Items, Prep);
- _ ->
+ _ ->
+ Majority = needs_majority(Tab, Prep),
Snmp = val({Tab, snmp}),
Recs2 = do_prepare_items(Tid, Tab, Key, Types,
Snmp, Items, Prep#prep.records),
Prep2 = Prep#prep{records = Recs2, prev_tab = Tab,
+ majority = Majority,
prev_types = Types, prev_snmp = Snmp},
check_prep(Prep2, Types)
end.
@@ -1235,6 +1245,33 @@ do_prepare_items(Tid, Tab, Key, Types, Snmp, Items, Recs) ->
Recs2 = prepare_snmp(Tid, Tab, Key, Types, Snmp, Items, Recs), % May exit
prepare_nodes(Tid, Types, Items, Recs2, normal).
+
+needs_majority(Tab, #prep{majority = M}) ->
+ case lists:keymember(Tab, 1, M) of
+ true ->
+ M;
+ false ->
+ case ?catch_val({Tab, majority}) of
+ {'EXIT', _} ->
+ M;
+ false ->
+ M;
+ true ->
+ CopyHolders = val({Tab, all_nodes}),
+ [{Tab, CopyHolders} | M]
+ end
+ end.
+
+have_majority([], _) ->
+ ok;
+have_majority([{Tab, AllNodes} | Rest], Nodes) ->
+ case mnesia_lib:have_majority(Tab, AllNodes, Nodes) of
+ true ->
+ have_majority(Rest, Nodes);
+ false ->
+ {error, Tab}
+ end.
+
prepare_snmp(Tab, Key, Items) ->
case val({Tab, snmp}) of
[] ->
@@ -1261,10 +1298,15 @@ prepare_snmp(Tid, Tab, Key, Types, Us, Items, Recs) ->
prepare_nodes(Tid, Types, [{clear_table, Tab}], Recs, snmp)
end.
-check_prep(Prep, Types) when Prep#prep.types == Types ->
+check_prep(#prep{majority = [], types = Types} = Prep, Types) ->
Prep;
-check_prep(Prep, Types) when Prep#prep.types == undefined ->
- Prep#prep{types = Types};
+check_prep(#prep{majority = M, types = undefined} = Prep, Types) ->
+ Protocol = if M == [] ->
+ Prep#prep.protocol;
+ true ->
+ asym_trans
+ end,
+ Prep#prep{protocol = Protocol, types = Types};
check_prep(Prep, _Types) ->
Prep#prep{protocol = asym_trans}.
@@ -1311,7 +1353,7 @@ prepare_node(_Node, _Storage, [], Rec, _Kind) ->
%% multi_commit((Protocol, Tid, CommitRecords, Store)
%% Local work is always performed in users process
-multi_commit(read_only, Tid, CR, _Store) ->
+multi_commit(read_only, _Maj = [], Tid, CR, _Store) ->
%% This featherweight commit protocol is used when no
%% updates has been performed in the transaction.
@@ -1324,7 +1366,7 @@ multi_commit(read_only, Tid, CR, _Store) ->
?MODULE ! {delete_transaction, Tid},
do_commit;
-multi_commit(sym_trans, Tid, CR, Store) ->
+multi_commit(sym_trans, _Maj = [], Tid, CR, Store) ->
%% This lightweight commit protocol is used when all
%% the involved tables are replicated symetrically.
%% Their storage types must match on each node.
@@ -1376,7 +1418,7 @@ multi_commit(sym_trans, Tid, CR, Store) ->
[{tid, Tid}, {outcome, Outcome}]),
Outcome;
-multi_commit(sync_sym_trans, Tid, CR, Store) ->
+multi_commit(sync_sym_trans, _Maj = [], Tid, CR, Store) ->
%% This protocol is the same as sym_trans except that it
%% uses syncronized calls to disk_log and syncronized commits
%% when several nodes are involved.
@@ -1408,7 +1450,7 @@ multi_commit(sync_sym_trans, Tid, CR, Store) ->
[{tid, Tid}, {outcome, Outcome}]),
Outcome;
-multi_commit(asym_trans, Tid, CR, Store) ->
+multi_commit(asym_trans, Majority, Tid, CR, Store) ->
%% This more expensive commit protocol is used when
%% table definitions are changed (schema transactions).
%% It is also used when the involved tables are
@@ -1469,6 +1511,10 @@ multi_commit(asym_trans, Tid, CR, Store) ->
{D2, CR2} = commit_decision(D, CR, [], []),
DiscNs = D2#decision.disc_nodes,
RamNs = D2#decision.ram_nodes,
+ case have_majority(Majority, DiscNs ++ RamNs) of
+ ok -> ok;
+ {error, Tab} -> mnesia:abort({no_majority, Tab})
+ end,
Pending = mnesia_checkpoint:tm_enter_pending(Tid, DiscNs, RamNs),
?ets_insert(Store, Pending),
{WaitFor, Local} = ask_commit(asym_trans, Tid, CR2, DiscNs, RamNs),
@@ -1604,6 +1650,7 @@ tell_participants([Pid | Pids], Msg) ->
tell_participants([], _Msg) ->
ok.
+-spec commit_participant(_, _, _, _, _) -> no_return().
%% Trap exit because we can get a shutdown from application manager
commit_participant(Coord, Tid, Bin, DiscNs, RamNs) when is_binary(Bin) ->
process_flag(trap_exit, true),
@@ -1733,7 +1780,9 @@ do_commit(Tid, C, DumperMode) ->
R = do_snmp(Tid, C#commit.snmp),
R2 = do_update(Tid, ram_copies, C#commit.ram_copies, R),
R3 = do_update(Tid, disc_copies, C#commit.disc_copies, R2),
- do_update(Tid, disc_only_copies, C#commit.disc_only_copies, R3).
+ R4 = do_update(Tid, disc_only_copies, C#commit.disc_only_copies, R3),
+ mnesia_subscr:report_activity(Tid),
+ R4.
%% Update the items
do_update(Tid, Storage, [Op | Ops], OldRes) ->
@@ -2277,6 +2326,7 @@ fixtable(Tab, Lock, Me) ->
system_continue(_Parent, _Debug, State) ->
doit_loop(State).
+-spec system_terminate(_, _, _, _) -> no_return().
system_terminate(_Reason, _Parent, _Debug, State) ->
do_stop(State).
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-11 13:34:46 +0000