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Posted to commits@couchdb.apache.org by rn...@apache.org on 2023/06/29 14:57:35 UTC
[couchdb] branch out-of-disk-handler updated (b4acfddd2 -> 48abc5a12)
This is an automated email from the ASF dual-hosted git repository.
rnewson pushed a change to branch out-of-disk-handler
in repository https://gitbox.apache.org/repos/asf/couchdb.git
discard b4acfddd2 WIP Introduce countermeasures as we run out of disk space
new 48abc5a12 WIP Introduce countermeasures as we run out of disk space
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Summary of changes:
src/couch/src/couch_alarm_handler.erl | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
[couchdb] 01/01: WIP Introduce countermeasures as we run out of disk space
Posted by rn...@apache.org.
This is an automated email from the ASF dual-hosted git repository.
rnewson pushed a commit to branch out-of-disk-handler
in repository https://gitbox.apache.org/repos/asf/couchdb.git
commit 48abc5a1211f9a1f0e522af318ed15fef34aa410
Author: Robert Newson <rn...@apache.org>
AuthorDate: Tue Jun 20 11:52:46 2023 +0100
WIP Introduce countermeasures as we run out of disk space
---
rel/reltool.config | 1 +
src/chttpd/src/chttpd.erl | 2 +
src/couch/priv/stats_descriptions.cfg | 4 +
src/couch/src/couch_alarm_handler.erl | 167 +++++++++++++++++++++++++++++
src/couch/src/couch_app.erl | 3 +
src/couch_mrview/src/couch_mrview.erl | 8 +-
src/couch_mrview/src/couch_mrview_util.erl | 17 ++-
src/fabric/src/fabric_doc_update.erl | 2 +
src/fabric/src/fabric_rpc.erl | 44 +++++---
src/fabric/src/fabric_streams.erl | 4 +-
src/fabric/src/fabric_view.erl | 8 +-
src/fabric/src/fabric_view_map.erl | 4 +-
src/fabric/src/fabric_view_reduce.erl | 4 +
src/ken/src/ken_server.erl | 3 +-
14 files changed, 243 insertions(+), 28 deletions(-)
diff --git a/rel/reltool.config b/rel/reltool.config
index 0355a0b07..ebb15bb83 100644
--- a/rel/reltool.config
+++ b/rel/reltool.config
@@ -87,6 +87,7 @@
{app, sasl, [{incl_cond, include}]},
{app, ssl, [{incl_cond, include}]},
{app, stdlib, [{incl_cond, include}]},
+ {app, os_mon, [{incl_cond, include}]},
{app, syntax_tools, [{incl_cond, include}]},
{app, xmerl, [{incl_cond, include}]},
diff --git a/src/chttpd/src/chttpd.erl b/src/chttpd/src/chttpd.erl
index 53abc731f..c8e6fdc97 100644
--- a/src/chttpd/src/chttpd.erl
+++ b/src/chttpd/src/chttpd.erl
@@ -1138,6 +1138,8 @@ error_info(timeout) ->
>>};
error_info({service_unavailable, Reason}) ->
{503, <<"service unavailable">>, Reason};
+error_info({insufficient_storage, Reason}) ->
+ {507, <<"insufficent_storage">>, Reason};
error_info({timeout, _Reason}) ->
error_info(timeout);
error_info({'EXIT', {Error, _Stack}}) ->
diff --git a/src/couch/priv/stats_descriptions.cfg b/src/couch/priv/stats_descriptions.cfg
index 6c0d4dad2..1983eed9b 100644
--- a/src/couch/priv/stats_descriptions.cfg
+++ b/src/couch/priv/stats_descriptions.cfg
@@ -266,6 +266,10 @@
{type, counter},
{desc, <<"number of HTTP 503 Service unavailable responses">>}
]}.
+{[couchdb, httpd_status_codes, 507], [
+ {type, counter},
+ {desc, <<"number of HTTP 507 Insufficient Storage responses">>}
+]}.
{[couchdb, open_databases], [
{type, counter},
{desc, <<"number of open databases">>}
diff --git a/src/couch/src/couch_alarm_handler.erl b/src/couch/src/couch_alarm_handler.erl
new file mode 100644
index 000000000..b239ecc3f
--- /dev/null
+++ b/src/couch/src/couch_alarm_handler.erl
@@ -0,0 +1,167 @@
+% Licensed under the Apache License, Version 2.0 (the "License"); you may not
+% use this file except in compliance with the License. You may obtain a copy of
+% the License at
+%
+% http://www.apache.org/licenses/LICENSE-2.0
+%
+% Unless required by applicable law or agreed to in writing, software
+% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+% License for the specific language governing permissions and limitations under
+% the License.
+
+-module(couch_alarm_handler).
+-behaviour(gen_event).
+
+% public api
+-export([
+ database_dir_almost_full/0,
+ view_index_dir_almost_full/0
+]).
+
+% gen_event callbacks
+-export([
+ init/1,
+ handle_event/2,
+ handle_call/2,
+ handle_info/2
+]).
+
+-include_lib("kernel/include/file.hrl").
+
+-record(st, {
+ timer
+}).
+
+database_dir_almost_full() ->
+ {DatabaseDirAlmostFull, _ViewIndexDirAlmostFull} = get_almost_full(),
+ DatabaseDirAlmostFull.
+
+view_index_dir_almost_full() ->
+ {_DatabaseDirAlmostFull, ViewIndexDirAlmostFull} = get_almost_full(),
+ ViewIndexDirAlmostFull.
+
+init(_Args) ->
+ {ok, #st{}}.
+
+handle_event({set_alarm, Alarm}, St) ->
+ {ok, set_alarm(Alarm, St)};
+handle_event({clear_alarm, AlarmId}, St) ->
+ {ok, clear_alarm(AlarmId, St)};
+handle_event(_Event, St) ->
+ {ok, St}.
+
+handle_call(_Query, St) ->
+ {ok, {error, bad_query}, St}.
+
+handle_info({disk_almost_full, DatabaseDirAlmostFull, ViewIndexDirAlmostFull}, St) ->
+ set_almost_full(DatabaseDirAlmostFull, ViewIndexDirAlmostFull),
+ {ok, St#st{timer = undefined}};
+handle_info(_Msg, St) ->
+ {ok, St}.
+
+set_alarm({{disk_almost_full, MntOn}, []}, #st{} = St) ->
+ IsDatabaseDir = is_database_dir(MntOn),
+ IsViewIndexDir = is_view_index_dir(MntOn),
+ {DatabaseDirAlmostFull, ViewIndexDirAlmostFull} = get_almost_full(),
+ if
+ IsDatabaseDir andalso IsViewIndexDir ->
+ couch_log:warning(
+ "database_dir and view_index_dir almost full", []
+ ),
+ start_timer(true, true, St);
+ IsDatabaseDir ->
+ couch_log:warning("database_dir almost full", []),
+ start_timer(true, ViewIndexDirAlmostFull, St);
+ IsViewIndexDir ->
+ couch_log:warning("view_index_dir almost full", []),
+ start_timer(DatabaseDirAlmostFull, true, St);
+ true ->
+ St
+ end;
+set_alarm(Alarm, #st{} = St) ->
+ error_logger:info_report([{alarm_handler, {set, Alarm}}]),
+ St.
+
+clear_alarm({disk_almost_full, MntOn}, #st{} = St) ->
+ IsDatabaseDir = is_database_dir(MntOn),
+ IsViewIndexDir = is_view_index_dir(MntOn),
+ {DatabaseDirAlmostFull, ViewIndexDirAlmostFull} = get_almost_full(),
+ if
+ IsDatabaseDir andalso IsViewIndexDir ->
+ couch_log:notice(
+ "database_dir and view_index_dir no longer almost full",
+ []
+ ),
+ start_timer(false, false, St);
+ IsDatabaseDir ->
+ couch_log:notice("database_dir no longer almost full", []),
+ start_timer(false, ViewIndexDirAlmostFull, St);
+ IsViewIndexDir ->
+ couch_log:notice(
+ "view_index_dir no longer almost full", []
+ ),
+ start_timer(DatabaseDirAlmostFull, false, St);
+ true ->
+ St
+ end;
+clear_alarm(AlarmId, #st{} = St) ->
+ error_logger:info_report([{alarm_handler, {clear, AlarmId}}]),
+ St.
+
+start_timer(DatabaseDirAlmostFull, ViewIndexDirAlmostFull, #st{timer = undefined} = St) ->
+ case timer:send_after(5000, {disk_almost_full, DatabaseDirAlmostFull, DatabaseDirAlmostFull}) of
+ {ok, TRef} ->
+ St#st{timer = TRef};
+ {error, Reason} ->
+ couch_log:warning("failed to delay for reason ~p", [Reason]),
+ set_almost_full(DatabaseDirAlmostFull, ViewIndexDirAlmostFull),
+ St
+ end;
+start_timer(DatabaseDirAlmostFull, ViewIndexDirAlmostFull, #st{timer = TRef} = St) ->
+ timer:cancel(TRef),
+ start_timer(DatabaseDirAlmostFull, ViewIndexDirAlmostFull, St#st{timer = undefined}).
+
+is_database_dir(MntOn) ->
+ same_device(config:get("couchdb", "database_dir"), MntOn).
+
+is_view_index_dir(MntOn) ->
+ same_device(config:get("couchdb", "view_index_dir"), MntOn).
+
+same_device(DirA, DirB) ->
+ case {device_id(DirA), device_id(DirB)} of
+ {{ok, DeviceId}, {ok, DeviceId}} ->
+ true;
+ _Else ->
+ false
+ end.
+
+device_id(Dir) ->
+ case file:read_file_info(Dir) of
+ {ok, FileInfo} ->
+ {ok, {FileInfo#file_info.minor_device, FileInfo#file_info.major_device}};
+ {error, Reason} ->
+ {error, Reason}
+ end.
+
+get_almost_full() ->
+ <<DatabaseDirAlmostFull:1, ViewIndexDirAlmostFull:1>> = persistent_term:get(key(), <<0:2>>),
+ {DatabaseDirAlmostFull == 1, ViewIndexDirAlmostFull == 1}.
+
+%% keeping the term small so it finds in a single machine word
+%% is apparently better.
+set_almost_full(false, false) ->
+ couch_log:notice("Removing database_dir and view_index_dir full flag", []),
+ persistent_term:erase(key());
+set_almost_full(true, false) ->
+ couch_log:warning("Setting database_dir full flag", []),
+ persistent_term:put(key(), <<1:1, 0:1>>);
+set_almost_full(false, true) ->
+ couch_log:warning("Setting view_index_dir full flag", []),
+ persistent_term:put(key(), <<0:1, 1:1>>);
+set_almost_full(true, true) ->
+ couch_log:warning("Setting database_dir and view_index_dir full flag", []),
+ persistent_term:put(key(), <<1:1, 1:1>>).
+
+key() ->
+ {?MODULE, disk_almost_full}.
diff --git a/src/couch/src/couch_app.erl b/src/couch/src/couch_app.erl
index 8cd8c8482..1887d1451 100644
--- a/src/couch/src/couch_app.erl
+++ b/src/couch/src/couch_app.erl
@@ -21,6 +21,9 @@
]).
start(_Type, _) ->
+ %% register our alarm handler
+ gen_event:swap_handler(alarm_handler, {alarm_handler, swap}, {couch_alarm_handler, ok}),
+
case couch_sup:start_link() of
{ok, _} = Resp ->
{Time, _} = statistics(wall_clock),
diff --git a/src/couch_mrview/src/couch_mrview.erl b/src/couch_mrview/src/couch_mrview.erl
index 1a4a3ebcc..a50fcd670 100644
--- a/src/couch_mrview/src/couch_mrview.erl
+++ b/src/couch_mrview/src/couch_mrview.erl
@@ -291,8 +291,8 @@ query_view(Db, DDoc, VName, Args0, Callback, Acc0) ->
_ -> {ok, Acc0}
end,
query_view(Db, VInfo, Args, Callback, Acc1);
- ddoc_updated ->
- Callback(ok, ddoc_updated)
+ Error when Error == ddoc_updated; Error == insufficient_storage ->
+ Callback(ok, Error)
end.
get_view_index_pid(Db, DDoc, ViewName, Args0) ->
@@ -752,8 +752,8 @@ default_cb({final, Info}, []) ->
{ok, [Info]};
default_cb({final, _}, Acc) ->
{ok, Acc};
-default_cb(ok, ddoc_updated) ->
- {ok, ddoc_updated};
+default_cb(ok, Error) when Error == ddoc_updated; Error == insufficient_storage ->
+ {ok, Error};
default_cb(Row, Acc) ->
{ok, [Row | Acc]}.
diff --git a/src/couch_mrview/src/couch_mrview_util.erl b/src/couch_mrview/src/couch_mrview_util.erl
index 5913aa3d0..a6aa6edf0 100644
--- a/src/couch_mrview/src/couch_mrview_util.erl
+++ b/src/couch_mrview/src/couch_mrview_util.erl
@@ -158,8 +158,8 @@ get_view(Db, DDoc, ViewName, Args0) ->
check_range(Args3, view_cmp(View)),
Sig = view_sig(Db, State, View, Args3),
{ok, {Type, View, Ref}, Sig, Args3};
- ddoc_updated ->
- ddoc_updated
+ Error when Error == ddoc_updated; Error == insufficient_storage ->
+ Error
end.
get_view_index_pid(Db, DDoc, ViewName, Args0) ->
@@ -176,6 +176,7 @@ get_view_index_state(_, DDoc, _, _, RetryCount) when RetryCount < 0 ->
couch_log:warning("DDoc '~s' recreated too frequently", [DDoc#doc.id]),
throw({get_view_state, exceeded_retry_count});
get_view_index_state(Db, DDoc, ViewName, Args0, RetryCount) ->
+ ViewIndexDirAlmostFull = couch_alarm_handler:view_index_dir_almost_full(),
try
{ok, Pid, Args} = get_view_index_pid(Db, DDoc, ViewName, Args0),
UpdateSeq = couch_util:with_db(Db, fun(WDb) ->
@@ -190,12 +191,24 @@ get_view_index_state(Db, DDoc, ViewName, Args0, RetryCount) ->
couch_index:get_state(Pid, 0);
false ->
couch_index:get_state(Pid, 0);
+ _ when ViewIndexDirAlmostFull ->
+ %% if the view is already fresh enough, proceed.
+ %% otherwise it's an error until the view index alarm clears.
+ case couch_index:get_state(Pid, 0) of
+ {ok, #mrst{update_seq = MaybeSeq} = St} when MaybeSeq >= UpdateSeq ->
+ {ok, St};
+ {ok, #mrst{}} ->
+ insufficient_storage;
+ Else0 ->
+ Else0
+ end;
_ ->
couch_index:get_state(Pid, UpdateSeq)
end,
case State of
{ok, State0} -> {ok, State0, Args};
ddoc_updated -> ddoc_updated;
+ insufficient_storage -> insufficient_storage;
Else -> throw(Else)
end
catch
diff --git a/src/fabric/src/fabric_doc_update.erl b/src/fabric/src/fabric_doc_update.erl
index 77b424911..695ab07e9 100644
--- a/src/fabric/src/fabric_doc_update.erl
+++ b/src/fabric/src/fabric_doc_update.erl
@@ -112,6 +112,8 @@ handle_message({bad_request, Msg}, _, _) ->
throw({bad_request, Msg});
handle_message({forbidden, Msg}, _, _) ->
throw({forbidden, Msg});
+handle_message({insufficient_storage, Msg}, _, _) ->
+ throw({insufficient_storage, Msg});
handle_message({request_entity_too_large, Entity}, _, _) ->
throw({request_entity_too_large, Entity}).
diff --git a/src/fabric/src/fabric_rpc.erl b/src/fabric/src/fabric_rpc.erl
index b781eea99..e47e98b6f 100644
--- a/src/fabric/src/fabric_rpc.erl
+++ b/src/fabric/src/fabric_rpc.erl
@@ -274,21 +274,27 @@ get_missing_revs(DbName, IdRevsList, Options) ->
with_db(DbName, Options, {couch_db, get_missing_revs, [IdRevsList]}).
update_docs(DbName, Docs0, Options) ->
- {Docs1, Type} =
- case couch_util:get_value(read_repair, Options) of
- NodeRevs when is_list(NodeRevs) ->
- Filtered = read_repair_filter(DbName, Docs0, NodeRevs, Options),
- {Filtered, ?REPLICATED_CHANGES};
- undefined ->
- X =
- case proplists:get_value(?REPLICATED_CHANGES, Options) of
- true -> ?REPLICATED_CHANGES;
- _ -> ?INTERACTIVE_EDIT
- end,
- {Docs0, X}
- end,
- Docs2 = make_att_readers(Docs1),
- with_db(DbName, Options, {couch_db, update_docs, [Docs2, Options, Type]}).
+ %% only if there's room
+ case couch_alarm_handler:database_dir_almost_full() of
+ true ->
+ rexi:reply({insufficient_storage, <<"database_dir almost full">>});
+ false ->
+ {Docs1, Type} =
+ case couch_util:get_value(read_repair, Options) of
+ NodeRevs when is_list(NodeRevs) ->
+ Filtered = read_repair_filter(DbName, Docs0, NodeRevs, Options),
+ {Filtered, ?REPLICATED_CHANGES};
+ undefined ->
+ X =
+ case proplists:get_value(?REPLICATED_CHANGES, Options) of
+ true -> ?REPLICATED_CHANGES;
+ _ -> ?INTERACTIVE_EDIT
+ end,
+ {Docs0, X}
+ end,
+ Docs2 = make_att_readers(Docs1),
+ with_db(DbName, Options, {couch_db, update_docs, [Docs2, Options, Type]})
+ end.
get_purge_seq(DbName, Options) ->
with_db(DbName, Options, {couch_db, get_purge_seq, []}).
@@ -493,7 +499,9 @@ view_cb(complete, Acc) ->
ok = rexi:stream_last(complete),
{ok, Acc};
view_cb(ok, ddoc_updated) ->
- rexi:reply({ok, ddoc_updated}).
+ rexi:reply({ok, ddoc_updated});
+view_cb(ok, insufficient_storage) ->
+ rexi:reply({ok, insufficient_storage}).
reduce_cb({meta, Meta}, Acc) ->
% Map function starting
@@ -511,7 +519,9 @@ reduce_cb(complete, Acc) ->
ok = rexi:stream_last(complete),
{ok, Acc};
reduce_cb(ok, ddoc_updated) ->
- rexi:reply({ok, ddoc_updated}).
+ rexi:reply({ok, ddoc_updated});
+reduce_cb(ok, insufficient_storage) ->
+ rexi:reply({ok, insufficient_storage}).
changes_enumerator(#full_doc_info{} = FDI, Acc) ->
changes_enumerator(couch_doc:to_doc_info(FDI), Acc);
diff --git a/src/fabric/src/fabric_streams.erl b/src/fabric/src/fabric_streams.erl
index 2a3a2b004..318824814 100644
--- a/src/fabric/src/fabric_streams.erl
+++ b/src/fabric/src/fabric_streams.erl
@@ -144,11 +144,11 @@ handle_stream_start(rexi_STREAM_INIT, {Worker, From}, St) ->
{stop, St#stream_acc{workers = [], ready = Ready1}}
end
end;
-handle_stream_start({ok, ddoc_updated}, _, St) ->
+handle_stream_start({ok, Error}, _, St) when Error == ddoc_updated; Error == insufficient_storage ->
WaitingWorkers = [W || {W, _} <- St#stream_acc.workers],
ReadyWorkers = [W || {W, _} <- St#stream_acc.ready],
cleanup(WaitingWorkers ++ ReadyWorkers),
- {stop, ddoc_updated};
+ {stop, Error};
handle_stream_start(Else, _, _) ->
exit({invalid_stream_start, Else}).
diff --git a/src/fabric/src/fabric_view.erl b/src/fabric/src/fabric_view.erl
index 82f9c2bc6..15eb54353 100644
--- a/src/fabric/src/fabric_view.erl
+++ b/src/fabric/src/fabric_view.erl
@@ -415,7 +415,13 @@ maybe_update_others(
ViewName,
#mrargs{update = lazy} = Args
) ->
- ShardsNeedUpdated = mem3:shards(DbName) -- ShardsInvolved,
+ ViewIndexDirAlmostFull = couch_alarm_handler:view_index_dir_almost_full(),
+ ShardsNeedUpdated = case ViewIndexDirAlmostFull of
+ true ->
+ [];
+ false ->
+ mem3:shards(DbName) -- ShardsInvolved
+ end,
lists:foreach(
fun(#shard{node = Node, name = ShardName}) ->
rpc:cast(Node, fabric_rpc, update_mrview, [ShardName, DDoc, ViewName, Args])
diff --git a/src/fabric/src/fabric_view_map.erl b/src/fabric/src/fabric_view_map.erl
index 7b3b75863..b264ed5c4 100644
--- a/src/fabric/src/fabric_view_map.erl
+++ b/src/fabric/src/fabric_view_map.erl
@@ -56,6 +56,8 @@ go(Db, Options, DDoc, View, Args0, Callback, Acc, VInfo) ->
of
{ok, ddoc_updated} ->
Callback({error, ddoc_updated}, Acc);
+ {ok, insufficient_storage} ->
+ Callback({error, {insufficient_storage, <<"not enough room to update index">>}}, Acc);
{ok, Workers} ->
try
go(DbName, Workers, VInfo, CoordArgs, Callback, Acc)
@@ -206,7 +208,7 @@ handle_message({execution_stats, _} = Msg, {_, From}, St) ->
{Go, Acc} = Callback(Msg, AccIn),
rexi:stream_ack(From),
{Go, St#collector{user_acc = Acc}};
-handle_message(ddoc_updated, _Worker, State) ->
+handle_message(Error, _Worker, State) when Error == ddoc_updated; Error == insufficient_storage ->
{stop, State}.
merge_row(Dir, Collation, undefined, Row, Rows0) ->
diff --git a/src/fabric/src/fabric_view_reduce.erl b/src/fabric/src/fabric_view_reduce.erl
index 90fa523a1..d4d17d5e1 100644
--- a/src/fabric/src/fabric_view_reduce.erl
+++ b/src/fabric/src/fabric_view_reduce.erl
@@ -47,6 +47,8 @@ go(Db, DDoc, VName, Args, Callback, Acc, VInfo) ->
of
{ok, ddoc_updated} ->
Callback({error, ddoc_updated}, Acc);
+ {ok, insufficient_storage} ->
+ Callback({error, insufficient_storage}, Acc);
{ok, Workers} ->
try
go2(DbName, Workers, VInfo, CoordArgs, Callback, Acc)
@@ -175,6 +177,8 @@ handle_message(complete, Worker, #collector{counters = Counters0} = State) ->
C1 = fabric_dict:update_counter(Worker, 1, Counters0),
fabric_view:maybe_send_row(State#collector{counters = C1});
handle_message(ddoc_updated, _Worker, State) ->
+ {stop, State};
+handle_message(insufficient_storage, _Worker, State) ->
{stop, State}.
os_proc_needed(<<"_", _/binary>>) -> false;
diff --git a/src/ken/src/ken_server.erl b/src/ken/src/ken_server.erl
index 929ba47d7..5b8c3bb9f 100644
--- a/src/ken/src/ken_server.erl
+++ b/src/ken/src/ken_server.erl
@@ -487,6 +487,7 @@ should_start_job(#job{name = Name, seq = Seq, server = Pid}, State) ->
IncrementalChannels = list_to_integer(config("incremental_channels", "80")),
BatchChannels = list_to_integer(config("batch_channels", "20")),
TotalChannels = IncrementalChannels + BatchChannels,
+ ViewIndexDirAlmostFull = couch_alarm_handler:view_index_dir_almost_full(),
A = get_active_count(),
#state{delay = Delay, batch_size = BS} = State,
case ets:lookup(ken_workers, Name) of
@@ -506,7 +507,7 @@ should_start_job(#job{name = Name, seq = Seq, server = Pid}, State) ->
% spawn an index update.
{ok, MRSt} = couch_index:get_state(Pid, 0),
CurrentSeq = couch_mrview_index:get(update_seq, MRSt),
- (Seq - CurrentSeq) < Threshold;
+ not ViewIndexDirAlmostFull andalso (Seq - CurrentSeq) < Threshold;
% Nouveau has three elements
{_, Index, nouveau} ->
nouveau_index_updater:outdated(Index);