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authorHans Bolinder <[email protected]>2010-10-19 16:13:19 +0200
committerHans Bolinder <[email protected]>2010-10-21 08:56:31 +0200
commit74af6abf8fe889f04f9fcfc70d5a5facf0aa7053 (patch)
treee7dd745a096538cf26229187d92f283eb58bf521 /lib
parentdc7d2319691fa599717c066460cce53ce97b6b18 (diff)
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Fix a bug concerning truncated Dets files
When several clients accessed a Dets table simultaneously, inserted or updated objects were sometimes lost due to the Dets file being truncated.
Diffstat (limited to 'lib')
-rw-r--r--lib/stdlib/src/dets.erl34
-rw-r--r--lib/stdlib/test/dets_SUITE.erl29
2 files changed, 42 insertions, 21 deletions
diff --git a/lib/stdlib/src/dets.erl b/lib/stdlib/src/dets.erl
index 4584b8184f..79bebada4d 100644
--- a/lib/stdlib/src/dets.erl
+++ b/lib/stdlib/src/dets.erl
@@ -1363,37 +1363,35 @@ start_auto_save_timer(Head) ->
%% lookup requests in parallel. Evalute delete_object, delete and
%% insert as well.
stream_op(Op, Pid, Pids, Head, N) ->
- stream_op(Head, Pids, [], N, Pid, Op, Head#head.fixed).
+ #head{fixed = Fxd, update_mode = M} = Head,
+ stream_op(Head, Pids, [], N, Pid, Op, Fxd, M).
-stream_loop(Head, Pids, C, N, false = Fxd) ->
+stream_loop(Head, Pids, C, N, false = Fxd, M) ->
receive
?DETS_CALL(From, Message) ->
- stream_op(Head, Pids, C, N, From, Message, Fxd)
+ stream_op(Head, Pids, C, N, From, Message, Fxd, M)
after 0 ->
stream_end(Head, Pids, C, N, no_more)
end;
-stream_loop(Head, Pids, C, N, _Fxd) ->
+stream_loop(Head, Pids, C, N, _Fxd, _M) ->
stream_end(Head, Pids, C, N, no_more).
-stream_op(Head, Pids, C, N, Pid, {lookup_keys,Keys}, Fxd) ->
+stream_op(Head, Pids, C, N, Pid, {lookup_keys,Keys}, Fxd, M) ->
NC = [{{lookup,Pid},Keys} | C],
- stream_loop(Head, Pids, NC, N, Fxd);
-stream_op(Head, Pids, C, N, Pid, {insert, _Objects} = Op, Fxd) ->
+ stream_loop(Head, Pids, NC, N, Fxd, M);
+stream_op(Head, Pids, C, N, Pid, {insert, _Objects} = Op, Fxd, dirty = M) ->
NC = [Op | C],
- stream_loop(Head, [Pid | Pids], NC, N, Fxd);
-stream_op(Head, Pids, C, N, Pid, {insert_new, _Objects} = Op, Fxd) ->
+ stream_loop(Head, [Pid | Pids], NC, N, Fxd, M);
+stream_op(Head, Pids, C, N, Pid, {delete_key, _Keys} = Op, Fxd, dirty = M) ->
NC = [Op | C],
- stream_loop(Head, [Pid | Pids], NC, N, Fxd);
-stream_op(Head, Pids, C, N, Pid, {delete_key, _Keys} = Op, Fxd) ->
+ stream_loop(Head, [Pid | Pids], NC, N, Fxd, M);
+stream_op(Head, Pids, C, N, Pid, {delete_object, _Os} = Op, Fxd, dirty = M) ->
NC = [Op | C],
- stream_loop(Head, [Pid | Pids], NC, N, Fxd);
-stream_op(Head, Pids, C, N, Pid, {delete_object, _Objects} = Op, Fxd) ->
- NC = [Op | C],
- stream_loop(Head, [Pid | Pids], NC, N, Fxd);
-stream_op(Head, Pids, C, N, Pid, {member, Key}, Fxd) ->
+ stream_loop(Head, [Pid | Pids], NC, N, Fxd, M);
+stream_op(Head, Pids, C, N, Pid, {member, Key}, Fxd, M) ->
NC = [{{lookup,[Pid]},[Key]} | C],
- stream_loop(Head, Pids, NC, N, Fxd);
-stream_op(Head, Pids, C, N, Pid, Op, _Fxd) ->
+ stream_loop(Head, Pids, NC, N, Fxd, M);
+stream_op(Head, Pids, C, N, Pid, Op, _Fxd, _M) ->
stream_end(Head, Pids, C, N, {Pid,Op}).
stream_end(Head, Pids0, C, N, Next) ->
diff --git a/lib/stdlib/test/dets_SUITE.erl b/lib/stdlib/test/dets_SUITE.erl
index 760e610e00..82684000bb 100644
--- a/lib/stdlib/test/dets_SUITE.erl
+++ b/lib/stdlib/test/dets_SUITE.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1996-2009. All Rights Reserved.
+%% Copyright Ericsson AB 1996-2010. 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
@@ -50,7 +50,7 @@
otp_4208/1, otp_4989/1, many_clients/1, otp_4906/1, otp_5402/1,
simultaneous_open/1, insert_new/1, repair_continuation/1,
otp_5487/1, otp_6206/1, otp_6359/1, otp_4738/1, otp_7146/1,
- otp_8070/1]).
+ otp_8070/1, otp_8898/1]).
-export([dets_dirty_loop/0]).
@@ -108,7 +108,7 @@ all(suite) ->
cache_duplicate_bags_v9, otp_4208, otp_4989, many_clients,
otp_4906, otp_5402, simultaneous_open, insert_new,
repair_continuation, otp_5487, otp_6206, otp_6359, otp_4738,
- otp_7146, otp_8070]}
+ otp_7146, otp_8070, otp_8898]}
end.
not_run(suite) -> [];
@@ -2935,6 +2935,29 @@ ets_init(Tab, N) ->
ets:insert(Tab, {N,N}),
ets_init(Tab, N - 1).
+otp_8898(doc) ->
+ ["OTP-8898. Truncated Dets file."];
+otp_8898(suite) ->
+ [];
+otp_8898(Config) when is_list(Config) ->
+ Tab = otp_8898,
+ ?line FName = filename(Tab, Config),
+
+ Server = self(),
+
+ ?line file:delete(FName),
+ ?line {ok, _} = dets:open_file(Tab,[{file, FName}]),
+ ?line [P1,P2,P3] = new_clients(3, Tab),
+
+ Seq = [{P1,[sync]},{P2,[{lookup,1,[]}]},{P3,[{insert,{1,b}}]}],
+ ?line atomic_requests(Server, Tab, [[]], Seq),
+ ?line true = get_replies([{P1,ok},{P2,ok},{P3,ok}]),
+ ?line ok = dets:close(Tab),
+ ?line {ok, _} = dets:open_file(Tab,[{file, FName}]),
+ ?line file:delete(FName),
+
+ ok.
+
many_clients(doc) ->
["Several clients accessing a table simultaneously."];
many_clients(suite) ->