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% 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(mem3_reshard_index).
-export([
design_docs/1,
target_indices/2,
spawn_builders/1,
build_index/2
]).
-define(MRVIEW, mrview).
-define(DREYFUS, dreyfus).
-define(HASTINGS, hastings).
-define(NOUVEAU, nouveau).
-include_lib("mem3/include/mem3.hrl").
%% Public API
design_docs(DbName) ->
try
case fabric_design_docs(mem3:dbname(DbName)) of
{error, {maintenance_mode, _, _Node}} ->
{ok, []};
{ok, DDocs} ->
JsonDocs = [couch_doc:from_json_obj(DDoc) || DDoc <- DDocs],
{ok, JsonDocs};
Else ->
Else
end
catch
error:database_does_not_exist ->
{ok, []}
end.
target_indices(Docs, Targets) ->
Indices = [[indices(N, D) || D <- Docs] || #shard{name = N} <- Targets],
lists:flatten(Indices).
spawn_builders(Indices) ->
Retries = max_retries(),
[spawn_link(?MODULE, build_index, [Idx, Retries]) || Idx <- Indices].
%% Private API
fabric_design_docs(DbName) ->
case couch_util:with_proc(fabric, design_docs, [DbName], infinity) of
{ok, Resp} -> Resp;
{error, Error} -> Error
end.
indices(DbName, Doc) ->
mrview_indices(DbName, Doc) ++
nouveau_indices(DbName, Doc) ++
[dreyfus_indices(DbName, Doc) || has_app(dreyfus)] ++
[hastings_indices(DbName, Doc) || has_app(hastings)].
mrview_indices(DbName, Doc) ->
try
{ok, MRSt} = couch_mrview_util:ddoc_to_mrst(DbName, Doc),
Views = couch_mrview_index:get(views, MRSt),
case Views =/= [] of
true ->
[{?MRVIEW, DbName, MRSt}];
false ->
[]
end
catch
Tag:Err ->
Msg = "~p couldn't get mrview index ~p ~p ~p:~p",
couch_log:error(Msg, [?MODULE, DbName, Doc, Tag, Err]),
[]
end.
nouveau_indices(DbName, Doc) ->
case nouveau:enabled() of
false ->
[];
true ->
try
Indices = nouveau_util:design_doc_to_indexes(DbName, Doc),
[{?NOUVEAU, DbName, Index} || Index <- Indices]
catch
Tag:Err ->
Msg = "~p couldn't get nouveau indices ~p ~p ~p:~p",
couch_log:error(Msg, [?MODULE, DbName, Doc, Tag, Err]),
[]
end
end.
dreyfus_indices(DbName, Doc) ->
try
Indices = dreyfus_index:design_doc_to_indexes(Doc),
[{?DREYFUS, DbName, Index} || Index <- Indices]
catch
Tag:Err ->
Msg = "~p couldn't get dreyfus indices ~p ~p ~p:~p",
couch_log:error(Msg, [?MODULE, DbName, Doc, Tag, Err]),
[]
end.
hastings_indices(DbName, Doc) ->
try
Indices = hastings_index:design_doc_to_indexes(Doc),
[{?HASTINGS, DbName, Index} || Index <- Indices]
catch
Tag:Err ->
Msg = "~p couldn't get hasting indices ~p ~p ~p:~p",
couch_log:error(Msg, [?MODULE, DbName, Doc, Tag, Err]),
[]
end.
build_index({?MRVIEW, DbName, MRSt} = Ctx, Try) ->
ioq:set_io_priority({reshard, DbName}),
await_retry(
couch_index_server:get_index(couch_mrview_index, MRSt),
fun couch_index:get_state/2,
Ctx,
Try
);
build_index({?NOUVEAU, _DbName, DIndex} = Ctx, Try) ->
UpdateFun = fun() -> nouveau_index_updater:update(DIndex) end,
retry_loop(Ctx, UpdateFun, Try);
build_index({?DREYFUS, DbName, DIndex} = Ctx, Try) ->
await_retry(
dreyfus_index_manager:get_index(DbName, DIndex),
fun dreyfus_index:await/2,
Ctx,
Try
);
build_index({?HASTINGS, DbName, HIndex} = Ctx, Try) ->
await_retry(
hastings_index_manager:get_index(DbName, HIndex),
fun hastings_index:await/2,
Ctx,
Try
).
await_retry({ok, Pid}, AwaitIndex, {_, DbName, _} = Ctx, Try) ->
UpdateFun = fun() ->
case AwaitIndex(Pid, get_update_seq(DbName)) of
{ok, _} -> ok;
{ok, _, _} -> ok;
AwaitError -> AwaitError
end
end,
retry_loop(Ctx, UpdateFun, Try);
await_retry(OpenError, _AwaitIndex, Ctx, Try) ->
maybe_retry(Ctx, OpenError, Try).
retry_loop(Ctx, UpdateFun, Try) ->
try UpdateFun() of
ok -> ok;
UpdateError -> maybe_retry(Ctx, UpdateError, Try)
catch
_:CatchError ->
maybe_retry(Ctx, CatchError, Try)
end.
maybe_retry(Ctx, killed = Error, Try) ->
retry(Ctx, Error, Try);
maybe_retry(Ctx, {killed, _} = Error, Try) ->
retry(Ctx, Error, Try);
maybe_retry(Ctx, shutdown = Error, Try) ->
retry(Ctx, Error, Try);
maybe_retry(Ctx, Error, 0) ->
fail(Ctx, Error);
maybe_retry(Ctx, Error, Try) when is_integer(Try), Try > 0 ->
retry(Ctx, Error, Try - 1).
retry(Ctx, Error, Try) ->
IndexInfo = index_info(Ctx),
LogMsg = "~p : error ~p when building ~p, retrying (~p)",
couch_log:warning(LogMsg, [?MODULE, Error, IndexInfo, Try]),
timer:sleep(retry_interval_sec() * 1000),
build_index(Ctx, Try).
fail(Ctx, Error) ->
IndexInfo = index_info(Ctx),
LogMsg = "~p : error ~p when building ~p, max tries exceeded, failing",
couch_log:error(LogMsg, [?MODULE, Error, IndexInfo]),
exit({error_building_index, IndexInfo}).
index_info({?MRVIEW, DbName, MRSt}) ->
GroupName = couch_mrview_index:get(idx_name, MRSt),
{DbName, GroupName};
index_info({?DREYFUS, DbName, Index}) ->
{DbName, Index};
index_info({?HASTINGS, DbName, Index}) ->
{DbName, Index}.
has_app(App) ->
code:lib_dir(App) /= {error, bad_name}.
get_update_seq(DbName) ->
couch_util:with_db(DbName, fun(Db) ->
couch_db:get_update_seq(Db)
end).
max_retries() ->
config:get_integer("reshard", "index_max_retries", 5).
retry_interval_sec() ->
config:get_integer("reshard", "index_retry_interval_sec", 10).
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