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Posted to commits@couchdb.apache.org by fd...@apache.org on 2011/06/23 11:45:39 UTC
svn commit: r1138798 - in /couchdb/branches/1.1.x/src/couchdb: couch_db.hrl
couch_view_compactor.erl couch_view_group.erl couch_view_updater.erl
Author: fdmanana
Date: Thu Jun 23 09:45:39 2011
New Revision: 1138798
URL: http://svn.apache.org/viewvc?rev=1138798&view=rev
Log:
Merged revision 1138796 from trunk
Simpler and safer db open/closing in view group servers
This makes the opening and closing of databases in the view
group server to be more friendly with the db reference counting
system, avoiding more potential db file leaking after compaction,
as we currently open a database in one process and use it on
another process (view compactor, view updater).
This significantly reduces the chances of failure when compacting
very large views as discussed in COUCHDB-994.
This relates to COUCHDB-926 and COUCHDB-994.
Modified:
couchdb/branches/1.1.x/src/couchdb/couch_db.hrl
couchdb/branches/1.1.x/src/couchdb/couch_view_compactor.erl
couchdb/branches/1.1.x/src/couchdb/couch_view_group.erl
couchdb/branches/1.1.x/src/couchdb/couch_view_updater.erl
Modified: couchdb/branches/1.1.x/src/couchdb/couch_db.hrl
URL: http://svn.apache.org/viewvc/couchdb/branches/1.1.x/src/couchdb/couch_db.hrl?rev=1138798&r1=1138797&r2=1138798&view=diff
==============================================================================
--- couchdb/branches/1.1.x/src/couchdb/couch_db.hrl (original)
+++ couchdb/branches/1.1.x/src/couchdb/couch_db.hrl Thu Jun 23 09:45:39 2011
@@ -206,7 +206,6 @@
-record(group, {
sig=nil,
- db=nil,
fd=nil,
name,
def_lang,
Modified: couchdb/branches/1.1.x/src/couchdb/couch_view_compactor.erl
URL: http://svn.apache.org/viewvc/couchdb/branches/1.1.x/src/couchdb/couch_view_compactor.erl?rev=1138798&r1=1138797&r2=1138798&view=diff
==============================================================================
--- couchdb/branches/1.1.x/src/couchdb/couch_view_compactor.erl (original)
+++ couchdb/branches/1.1.x/src/couchdb/couch_view_compactor.erl Thu Jun 23 09:45:39 2011
@@ -20,14 +20,14 @@
%% @doc Compacts the views. GroupId must not include the _design/ prefix
start_compact(DbName, GroupId) ->
Pid = couch_view:get_group_server(DbName, <<"_design/",GroupId/binary>>),
- gen_server:cast(Pid, {start_compact, fun compact_group/2}).
+ gen_server:cast(Pid, {start_compact, fun compact_group/3}).
%%=============================================================================
%% internal functions
%%=============================================================================
%% @spec compact_group(Group, NewGroup) -> ok
-compact_group(Group, EmptyGroup) ->
+compact_group(Group, EmptyGroup, DbName) ->
#group{
current_seq = Seq,
id_btree = IdBtree,
@@ -36,15 +36,15 @@ compact_group(Group, EmptyGroup) ->
} = Group,
#group{
- db = Db,
id_btree = EmptyIdBtree,
views = EmptyViews
} = EmptyGroup,
+ {ok, Db} = couch_db:open_int(DbName, []),
{ok, {Count, _}} = couch_btree:full_reduce(Db#db.fulldocinfo_by_id_btree),
+ couch_db:close(Db),
<<"_design", ShortName/binary>> = GroupId,
- DbName = couch_db:name(Db),
TaskName = <<DbName/binary, ShortName/binary>>,
couch_task_status:add_task(<<"View Group Compaction">>, TaskName, <<"">>),
Modified: couchdb/branches/1.1.x/src/couchdb/couch_view_group.erl
URL: http://svn.apache.org/viewvc/couchdb/branches/1.1.x/src/couchdb/couch_view_group.erl?rev=1138798&r1=1138797&r2=1138798&view=diff
==============================================================================
--- couchdb/branches/1.1.x/src/couchdb/couch_view_group.erl (original)
+++ couchdb/branches/1.1.x/src/couchdb/couch_view_group.erl Thu Jun 23 09:45:39 2011
@@ -78,7 +78,7 @@ start_link(InitArgs) ->
init({{_, DbName, _} = InitArgs, ReturnPid, Ref}) ->
process_flag(trap_exit, true),
try prepare_group(InitArgs, false) of
- {ok, #group{db=Db, fd=Fd, current_seq=Seq}=Group} ->
+ {ok, Db, #group{fd=Fd, current_seq=Seq}=Group} ->
case Seq > couch_db:get_update_seq(Db) of
true ->
ReturnPid ! {Ref, self(), {error, invalid_view_seq}},
@@ -90,7 +90,7 @@ init({{_, DbName, _} = InitArgs, ReturnP
{ok, #group_state{
db_name=DbName,
init_args=InitArgs,
- group=Group#group{db=nil},
+ group=Group,
ref_counter=RefCounter}}
end;
Error ->
@@ -124,14 +124,11 @@ handle_call({request_group, RequestSeq},
updater_pid=nil,
waiting_list=WaitList
}=State) when RequestSeq > Seq ->
- {ok, Db} = couch_db:open_int(DbName, []),
- Group2 = Group#group{db=Db},
Owner = self(),
- Pid = spawn_link(fun()-> couch_view_updater:update(Owner, Group2) end),
+ Pid = spawn_link(fun()-> couch_view_updater:update(Owner, Group, DbName) end),
{noreply, State#group_state{
updater_pid=Pid,
- group=Group2,
waiting_list=[{From,RequestSeq}|WaitList]
}, infinity};
@@ -166,7 +163,8 @@ handle_cast({start_compact, CompactFun},
{ok, Db} = couch_db:open_int(DbName, []),
{ok, Fd} = open_index_file(compact, RootDir, DbName, GroupSig),
NewGroup = reset_file(Db, Fd, DbName, Group),
- Pid = spawn_link(fun() -> CompactFun(Group, NewGroup) end),
+ couch_db:close(Db),
+ Pid = spawn_link(fun() -> CompactFun(Group, NewGroup, DbName) end),
{noreply, State#group_state{compactor_pid = Pid}};
handle_cast({start_compact, _}, State) ->
%% compact already running, this is a no-op
@@ -176,7 +174,7 @@ handle_cast({compact_done, #group{curren
#group_state{group = #group{current_seq=OldSeq}} = State)
when NewSeq >= OldSeq ->
#group_state{
- group = #group{name=GroupId, fd=OldFd, sig=GroupSig} = Group,
+ group = #group{name=GroupId, fd=OldFd, sig=GroupSig},
init_args = {RootDir, DbName, _},
updater_pid = UpdaterPid,
compactor_pid = CompactorPid,
@@ -195,7 +193,7 @@ handle_cast({compact_done, #group{curren
unlink(UpdaterPid),
exit(UpdaterPid, view_compaction_complete),
Owner = self(),
- spawn_link(fun()-> couch_view_updater:update(Owner, NewGroup) end);
+ spawn_link(fun()-> couch_view_updater:update(Owner, NewGroup, DbName) end);
true ->
nil
end,
@@ -206,19 +204,10 @@ handle_cast({compact_done, #group{curren
unlink(OldFd),
couch_ref_counter:drop(RefCounter),
{ok, NewRefCounter} = couch_ref_counter:start([NewGroup#group.fd]),
- case Group#group.db of
- nil -> ok;
- Else -> couch_db:close(Else)
- end,
-
- case NewGroup#group.db of
- nil -> ok;
- _ -> couch_db:close(NewGroup#group.db)
- end,
self() ! delayed_commit,
{noreply, State#group_state{
- group=NewGroup#group{db = nil},
+ group=NewGroup,
ref_counter=NewRefCounter,
compactor_pid=nil,
updater_pid=NewUpdaterPid
@@ -230,18 +219,15 @@ handle_cast({compact_done, NewGroup}, St
} = State,
?LOG_INFO("View index compaction still behind for ~s ~s -- current: ~p " ++
"compact: ~p", [DbName, GroupId, CurrentSeq, NewGroup#group.current_seq]),
- couch_db:close(NewGroup#group.db),
Pid = spawn_link(fun() ->
- {ok, Db} = couch_db:open_int(DbName, []),
{_,Ref} = erlang:spawn_monitor(fun() ->
- couch_view_updater:update(nil, NewGroup#group{db = Db})
+ couch_view_updater:update(nil, NewGroup, DbName)
end),
receive
{'DOWN', Ref, _, _, {new_group, NewGroup2}} ->
- couch_db:close(Db),
#group{name=GroupId} = NewGroup2,
Pid2 = couch_view:get_group_server(DbName, GroupId),
- gen_server:cast(Pid2, {compact_done, NewGroup2#group{db = nil}})
+ gen_server:cast(Pid2, {compact_done, NewGroup2})
end
end),
{noreply, State#group_state{compactor_pid = Pid}};
@@ -283,13 +269,12 @@ handle_info(delayed_commit, #group_state
{noreply, State#group_state{waiting_commit=true}}
end;
-handle_info({'EXIT', FromPid, {new_group, #group{db=Db}=Group}},
+handle_info({'EXIT', FromPid, {new_group, Group}},
#group_state{db_name=DbName,
updater_pid=UpPid,
ref_counter=RefCounter,
waiting_list=WaitList,
waiting_commit=WaitingCommit}=State) when UpPid == FromPid ->
- ok = couch_db:close(Db),
if not WaitingCommit ->
erlang:send_after(1000, self(), delayed_commit);
true -> ok
@@ -297,30 +282,27 @@ handle_info({'EXIT', FromPid, {new_group
case reply_with_group(Group, WaitList, [], RefCounter) of
[] ->
{noreply, State#group_state{waiting_commit=true, waiting_list=[],
- group=Group#group{db=nil}, updater_pid=nil}};
+ group=Group, updater_pid=nil}};
StillWaiting ->
% we still have some waiters, reopen the database and reupdate the index
- {ok, Db2} = couch_db:open_int(DbName, []),
- Group2 = Group#group{db=Db2},
Owner = self(),
- Pid = spawn_link(fun() -> couch_view_updater:update(Owner, Group2) end),
+ Pid = spawn_link(fun() -> couch_view_updater:update(Owner, Group, DbName) end),
{noreply, State#group_state{waiting_commit=true,
- waiting_list=StillWaiting, group=Group2, updater_pid=Pid}}
+ waiting_list=StillWaiting, updater_pid=Pid}}
end;
handle_info({'EXIT', _, {new_group, _}}, State) ->
%% message from an old (probably pre-compaction) updater; ignore
{noreply, State};
-handle_info({'EXIT', FromPid, reset},
- #group_state{
- init_args=InitArgs,
- updater_pid=UpPid,
- group=Group}=State) when UpPid == FromPid ->
- ok = couch_db:close(Group#group.db),
+handle_info({'EXIT', UpPid, reset},
+ #group_state{init_args=InitArgs, updater_pid=UpPid} = State) ->
case prepare_group(InitArgs, true) of
- {ok, ResetGroup} ->
+ {ok, Db, ResetGroup} ->
Owner = self(),
- Pid = spawn_link(fun()-> couch_view_updater:update(Owner, ResetGroup) end),
+ couch_db:close(Db),
+ Pid = spawn_link(fun() ->
+ couch_view_updater:update(Owner, ResetGroup, Db#db.name)
+ end),
{noreply, State#group_state{
updater_pid=Pid,
group=ResetGroup}};
@@ -386,17 +368,17 @@ prepare_group({RootDir, DbName, #group{s
{ok, Fd} ->
if ForceReset ->
% this can happen if we missed a purge
- {ok, reset_file(Db, Fd, DbName, Group)};
+ {ok, Db, reset_file(Db, Fd, DbName, Group)};
true ->
% 09 UPGRADE CODE
ok = couch_file:upgrade_old_header(Fd, <<$r, $c, $k, 0>>),
case (catch couch_file:read_header(Fd)) of
{ok, {Sig, HeaderInfo}} ->
% sigs match!
- {ok, init_group(Db, Fd, Group, HeaderInfo)};
+ {ok, Db, init_group(Db, Fd, Group, HeaderInfo)};
_ ->
% this happens on a new file
- {ok, reset_file(Db, Fd, DbName, Group)}
+ {ok, Db, reset_file(Db, Fd, DbName, Group)}
end
end;
Error ->
@@ -582,7 +564,7 @@ design_doc_to_view_group(#doc{id=Id,body
reset_group(#group{views=Views}=Group) ->
Views2 = [View#view{btree=nil} || View <- Views],
- Group#group{db=nil,fd=nil,query_server=nil,current_seq=0,
+ Group#group{fd=nil,query_server=nil,current_seq=0,
id_btree=nil,views=Views2}.
reset_file(Db, Fd, DbName, #group{sig=Sig,name=Name} = Group) ->
@@ -598,7 +580,7 @@ init_group(Db, Fd, #group{views=Views}=G
init_group(Db, Fd, Group,
#index_header{seq=0, purge_seq=couch_db:get_purge_seq(Db),
id_btree_state=nil, view_states=[{nil, 0, 0} || _ <- Views]});
-init_group(Db, Fd, #group{def_lang=Lang,views=Views}=
+init_group(_Db, Fd, #group{def_lang=Lang,views=Views}=
Group, IndexHeader) ->
#index_header{seq=Seq, purge_seq=PurgeSeq,
id_btree_state=IdBtreeState, view_states=ViewStates} = IndexHeader,
@@ -638,5 +620,5 @@ init_group(Db, Fd, #group{def_lang=Lang,
View#view{btree=Btree, update_seq=USeq, purge_seq=PSeq}
end,
ViewStates2, Views),
- Group#group{db=Db, fd=Fd, current_seq=Seq, purge_seq=PurgeSeq,
+ Group#group{fd=Fd, current_seq=Seq, purge_seq=PurgeSeq,
id_btree=IdBtree, views=Views2}.
Modified: couchdb/branches/1.1.x/src/couchdb/couch_view_updater.erl
URL: http://svn.apache.org/viewvc/couchdb/branches/1.1.x/src/couchdb/couch_view_updater.erl?rev=1138798&r1=1138797&r2=1138798&view=diff
==============================================================================
--- couchdb/branches/1.1.x/src/couchdb/couch_view_updater.erl (original)
+++ couchdb/branches/1.1.x/src/couchdb/couch_view_updater.erl Thu Jun 23 09:45:39 2011
@@ -12,30 +12,31 @@
-module(couch_view_updater).
--export([update/2]).
+-export([update/3]).
-include("couch_db.hrl").
--spec update(_, #group{}) -> no_return().
+-spec update(_, #group{}, Dbname::binary()) -> no_return().
-update(Owner, Group) ->
+update(Owner, Group, DbName) ->
#group{
- db = #db{name=DbName} = Db,
name = GroupName,
current_seq = Seq,
purge_seq = PurgeSeq
} = Group,
couch_task_status:add_task(<<"View Group Indexer">>, <<DbName/binary," ",GroupName/binary>>, <<"Starting index update">>),
+ {ok, Db} = couch_db:open_int(DbName, []),
DbPurgeSeq = couch_db:get_purge_seq(Db),
Group2 =
if DbPurgeSeq == PurgeSeq ->
Group;
DbPurgeSeq == PurgeSeq + 1 ->
couch_task_status:update(<<"Removing purged entries from view index.">>),
- purge_index(Group);
+ purge_index(Group, Db);
true ->
couch_task_status:update(<<"Resetting view index due to lost purge entries.">>),
+ couch_db:close(Db),
exit(reset)
end,
{ok, MapQueue} = couch_work_queue:new(
@@ -73,13 +74,14 @@ update(Owner, Group) ->
couch_task_status:set_update_frequency(0),
couch_task_status:update("Finishing."),
couch_work_queue:close(MapQueue),
+ couch_db:close(Db),
receive {new_group, NewGroup} ->
exit({new_group,
NewGroup#group{current_seq=couch_db:get_update_seq(Db)}})
end.
-purge_index(#group{db=Db, views=Views, id_btree=IdBtree}=Group) ->
+purge_index(#group{views=Views, id_btree=IdBtree}=Group, Db) ->
{ok, PurgedIdsRevs} = couch_db:get_last_purged(Db),
Ids = [Id || {Id, _Revs} <- PurgedIdsRevs],
{ok, Lookups, IdBtree2} = couch_btree:query_modify(IdBtree, Ids, [], Ids),