| % 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_mrview_updater). |
| |
| -export([start_update/4, purge/4, process_doc/3, finish_update/1]). |
| |
| -include_lib("couch/include/couch_db.hrl"). |
| -include_lib("couch_mrview/include/couch_mrview.hrl"). |
| |
| -define(REM_VAL, removed). |
| |
| start_update(Partial, State, NumChanges, NumChangesDone) -> |
| MaxSize = config:get_integer("view_updater", "queue_memory_cap", 100000), |
| MaxItems = config:get_integer("view_updater", "queue_item_cap", 500), |
| QueueOpts = [{max_size, MaxSize}, {max_items, MaxItems}], |
| {ok, DocQueue} = couch_work_queue:new(QueueOpts), |
| {ok, WriteQueue} = couch_work_queue:new(QueueOpts), |
| InitState = State#mrst{ |
| first_build=State#mrst.update_seq==0, |
| partial_resp_pid=Partial, |
| doc_acc=[], |
| doc_queue=DocQueue, |
| write_queue=WriteQueue |
| }, |
| |
| Self = self(), |
| |
| MapFun = fun() -> |
| erlang:put(io_priority, |
| {view_update, State#mrst.db_name, State#mrst.idx_name}), |
| Progress = case NumChanges of |
| 0 -> 0; |
| _ -> (NumChangesDone * 100) div NumChanges |
| end, |
| couch_task_status:add_task([ |
| {indexer_pid, ?l2b(pid_to_list(Partial))}, |
| {type, indexer}, |
| {database, State#mrst.db_name}, |
| {design_document, State#mrst.idx_name}, |
| {progress, Progress}, |
| {changes_done, NumChangesDone}, |
| {total_changes, NumChanges} |
| ]), |
| couch_task_status:set_update_frequency(500), |
| map_docs(Self, InitState) |
| end, |
| WriteFun = fun() -> |
| erlang:put(io_priority, |
| {view_update, State#mrst.db_name, State#mrst.idx_name}), |
| write_results(Self, InitState) |
| end, |
| spawn_link(MapFun), |
| spawn_link(WriteFun), |
| |
| {ok, InitState}. |
| |
| |
| purge(_Db, PurgeSeq, PurgedIdRevs, State) -> |
| #mrst{ |
| id_btree=IdBtree, |
| views=Views, |
| partitioned=Partitioned |
| } = State, |
| |
| Ids = [Id || {Id, _Revs} <- PurgedIdRevs], |
| {ok, Lookups, IdBtree2} = couch_btree:query_modify(IdBtree, Ids, [], Ids), |
| |
| MakeDictFun = fun |
| ({ok, {DocId, ViewNumRowKeys}}, DictAcc) -> |
| FoldFun = fun |
| ({ViewNum, {Key, Seq, _Op}}, DictAcc2) -> |
| dict:append(ViewNum, {Key, Seq, DocId}, DictAcc2); |
| ({ViewNum, RowKey0}, DictAcc2) -> |
| RowKey = if not Partitioned -> RowKey0; true -> |
| [{RK, _}] = inject_partition([{RowKey0, DocId}]), |
| RK |
| end, |
| dict:append(ViewNum, {RowKey, DocId}, DictAcc2) |
| end, |
| lists:foldl(FoldFun, DictAcc, ViewNumRowKeys); |
| ({not_found, _}, DictAcc) -> |
| DictAcc |
| end, |
| KeysToRemove = lists:foldl(MakeDictFun, dict:new(), Lookups), |
| |
| RemKeysFun = fun(#mrview{id_num=ViewId}=View) -> |
| ToRem = couch_util:dict_find(ViewId, KeysToRemove, []), |
| {ok, VBtree2} = couch_btree:add_remove(View#mrview.btree, [], ToRem), |
| NewPurgeSeq = case VBtree2 =/= View#mrview.btree of |
| true -> PurgeSeq; |
| _ -> View#mrview.purge_seq |
| end, |
| View#mrview{btree=VBtree2, purge_seq=NewPurgeSeq} |
| end, |
| |
| Views2 = lists:map(RemKeysFun, Views), |
| {ok, State#mrst{ |
| id_btree=IdBtree2, |
| views=Views2, |
| purge_seq=PurgeSeq |
| }}. |
| |
| |
| process_doc(Doc, Seq, #mrst{doc_acc=Acc}=State) when length(Acc) > 100 -> |
| couch_work_queue:queue(State#mrst.doc_queue, lists:reverse(Acc)), |
| process_doc(Doc, Seq, State#mrst{doc_acc=[]}); |
| process_doc(nil, Seq, #mrst{doc_acc=Acc}=State) -> |
| {ok, State#mrst{doc_acc=[{nil, Seq, nil} | Acc]}}; |
| process_doc(#doc{id=Id, deleted=true}, Seq, #mrst{doc_acc=Acc}=State) -> |
| {ok, State#mrst{doc_acc=[{Id, Seq, deleted} | Acc]}}; |
| process_doc(#doc{id=Id}=Doc, Seq, #mrst{doc_acc=Acc}=State) -> |
| {ok, State#mrst{doc_acc=[{Id, Seq, Doc} | Acc]}}. |
| |
| |
| finish_update(#mrst{doc_acc=Acc}=State) -> |
| if Acc /= [] -> |
| couch_work_queue:queue(State#mrst.doc_queue, Acc); |
| true -> ok |
| end, |
| couch_work_queue:close(State#mrst.doc_queue), |
| receive |
| {new_state, NewState} -> |
| {ok, NewState#mrst{ |
| first_build=undefined, |
| partial_resp_pid=undefined, |
| doc_acc=undefined, |
| doc_queue=undefined, |
| write_queue=undefined, |
| qserver=nil |
| }} |
| end. |
| |
| |
| map_docs(Parent, #mrst{db_name = DbName, idx_name = IdxName} = State0) -> |
| erlang:put(io_priority, {view_update, DbName, IdxName}), |
| case couch_work_queue:dequeue(State0#mrst.doc_queue) of |
| closed -> |
| couch_query_servers:stop_doc_map(State0#mrst.qserver), |
| couch_work_queue:close(State0#mrst.write_queue); |
| {ok, Dequeued} -> |
| % Run all the non deleted docs through the view engine and |
| % then pass the results on to the writer process. |
| State1 = case State0#mrst.qserver of |
| nil -> start_query_server(State0); |
| _ -> State0 |
| end, |
| QServer = State1#mrst.qserver, |
| DocFun = fun |
| ({nil, Seq, _}, {SeqAcc, Results}) -> |
| {erlang:max(Seq, SeqAcc), Results}; |
| ({Id, Seq, deleted}, {SeqAcc, Results}) -> |
| {erlang:max(Seq, SeqAcc), [{Id, []} | Results]}; |
| ({Id, Seq, Doc}, {SeqAcc, Results}) -> |
| couch_stats:increment_counter([couchdb, mrview, map_doc]), |
| {ok, Res} = couch_query_servers:map_doc_raw(QServer, Doc), |
| {erlang:max(Seq, SeqAcc), [{Id, Res} | Results]} |
| end, |
| FoldFun = fun(Docs, Acc) -> |
| update_task(length(Docs)), |
| lists:foldl(DocFun, Acc, Docs) |
| end, |
| Results = lists:foldl(FoldFun, {0, []}, Dequeued), |
| couch_work_queue:queue(State1#mrst.write_queue, Results), |
| map_docs(Parent, State1) |
| end. |
| |
| |
| write_results(Parent, #mrst{} = State) -> |
| case accumulate_writes(State, State#mrst.write_queue, nil) of |
| stop -> |
| Parent ! {new_state, State}; |
| {Go, {Seq, ViewKVs, DocIdKeys}} -> |
| NewState = write_kvs(State, Seq, ViewKVs, DocIdKeys), |
| if Go == stop -> |
| Parent ! {new_state, NewState}; |
| true -> |
| send_partial(NewState#mrst.partial_resp_pid, NewState), |
| write_results(Parent, NewState) |
| end |
| end. |
| |
| |
| start_query_server(State) -> |
| #mrst{ |
| language=Language, |
| lib=Lib, |
| views=Views |
| } = State, |
| Defs = [View#mrview.def || View <- Views], |
| {ok, QServer} = couch_query_servers:start_doc_map(Language, Defs, Lib), |
| State#mrst{qserver=QServer}. |
| |
| |
| accumulate_writes(State, W, Acc0) -> |
| {Seq, ViewKVs, DocIdKVs} = case Acc0 of |
| nil -> {0, [{V#mrview.id_num, []} || V <- State#mrst.views], []}; |
| _ -> Acc0 |
| end, |
| case couch_work_queue:dequeue(W) of |
| closed when Seq == 0 -> |
| stop; |
| closed -> |
| {stop, {Seq, ViewKVs, DocIdKVs}}; |
| {ok, Info} -> |
| {_, _, NewIds} = Acc = merge_results(Info, Seq, ViewKVs, DocIdKVs), |
| case accumulate_more(length(NewIds), Acc) of |
| true -> accumulate_writes(State, W, Acc); |
| false -> {ok, Acc} |
| end |
| end. |
| |
| |
| accumulate_more(NumDocIds, Acc) -> |
| % check if we have enough items now |
| MinItems = config:get("view_updater", "min_writer_items", "100"), |
| MinSize = config:get("view_updater", "min_writer_size", "16777216"), |
| CurrMem = ?term_size(Acc), |
| NumDocIds < list_to_integer(MinItems) |
| andalso CurrMem < list_to_integer(MinSize). |
| |
| |
| merge_results([], SeqAcc, ViewKVs, DocIdKeys) -> |
| {SeqAcc, ViewKVs, DocIdKeys}; |
| merge_results([{Seq, Results} | Rest], SeqAcc, ViewKVs, DocIdKeys) -> |
| Fun = fun(RawResults, {VKV, DIK}) -> |
| merge_results(RawResults, VKV, DIK) |
| end, |
| {ViewKVs1, DocIdKeys1} = lists:foldl(Fun, {ViewKVs, DocIdKeys}, Results), |
| merge_results(Rest, erlang:max(Seq, SeqAcc), ViewKVs1, DocIdKeys1). |
| |
| |
| merge_results({DocId, []}, ViewKVs, DocIdKeys) -> |
| {ViewKVs, [{DocId, []} | DocIdKeys]}; |
| merge_results({DocId, RawResults}, ViewKVs, DocIdKeys) -> |
| JsonResults = couch_query_servers:raw_to_ejson(RawResults), |
| Results = [[list_to_tuple(Res) || Res <- FunRs] || FunRs <- JsonResults], |
| case lists:flatten(Results) of |
| [] -> |
| {ViewKVs, [{DocId, []} | DocIdKeys]}; |
| _ -> |
| {ViewKVs1, ViewIdKeys} = insert_results(DocId, Results, ViewKVs, [], []), |
| {ViewKVs1, [ViewIdKeys | DocIdKeys]} |
| end. |
| |
| |
| insert_results(DocId, [], [], ViewKVs, ViewIdKeys) -> |
| {lists:reverse(ViewKVs), {DocId, ViewIdKeys}}; |
| insert_results(DocId, [KVs | RKVs], [{Id, VKVs} | RVKVs], VKVAcc, VIdKeys) -> |
| CombineDupesFun = fun |
| ({Key, Val}, {[{Key, {dups, Vals}} | Rest], IdKeys}) -> |
| {[{Key, {dups, [Val | Vals]}} | Rest], IdKeys}; |
| ({Key, Val1}, {[{Key, Val2} | Rest], IdKeys}) -> |
| {[{Key, {dups, [Val1, Val2]}} | Rest], IdKeys}; |
| ({Key, Value}, {Rest, IdKeys}) -> |
| {[{Key, Value} | Rest], [{Id, Key} | IdKeys]} |
| end, |
| InitAcc = {[], VIdKeys}, |
| couch_stats:increment_counter([couchdb, mrview, emits], length(KVs)), |
| {Duped, VIdKeys0} = lists:foldl(CombineDupesFun, InitAcc, |
| lists:sort(KVs)), |
| FinalKVs = [{{Key, DocId}, Val} || {Key, Val} <- Duped] ++ VKVs, |
| insert_results(DocId, RKVs, RVKVs, [{Id, FinalKVs} | VKVAcc], VIdKeys0). |
| |
| |
| write_kvs(State, UpdateSeq, ViewKVs, DocIdKeys) -> |
| #mrst{ |
| id_btree=IdBtree, |
| first_build=FirstBuild, |
| partitioned=Partitioned |
| } = State, |
| |
| {ok, ToRemove, IdBtree2} = update_id_btree(IdBtree, DocIdKeys, FirstBuild), |
| ToRemByView = collapse_rem_keys(ToRemove, dict:new()), |
| |
| UpdateView = fun(#mrview{id_num=ViewId}=View, {ViewId, KVs0}) -> |
| ToRem0 = couch_util:dict_find(ViewId, ToRemByView, []), |
| {KVs, ToRem} = case Partitioned of |
| true -> |
| KVs1 = inject_partition(KVs0), |
| ToRem1 = inject_partition(ToRem0), |
| {KVs1, ToRem1}; |
| false -> |
| {KVs0, ToRem0} |
| end, |
| {ok, VBtree2} = couch_btree:add_remove(View#mrview.btree, KVs, ToRem), |
| NewUpdateSeq = case VBtree2 =/= View#mrview.btree of |
| true -> UpdateSeq; |
| _ -> View#mrview.update_seq |
| end, |
| |
| View2 = View#mrview{btree=VBtree2, update_seq=NewUpdateSeq}, |
| maybe_notify(State, View2, KVs, ToRem), |
| View2 |
| end, |
| |
| State#mrst{ |
| views=lists:zipwith(UpdateView, State#mrst.views, ViewKVs), |
| update_seq=UpdateSeq, |
| id_btree=IdBtree2 |
| }. |
| |
| |
| inject_partition(Rows) -> |
| lists:map(fun |
| ({{Key, DocId}, Value}) -> |
| % Adding a row to the view |
| {Partition, _} = couch_partition:extract(DocId), |
| {{{p, Partition, Key}, DocId}, Value}; |
| ({Key, DocId}) -> |
| % Removing a row based on values in id_tree |
| {Partition, _} = couch_partition:extract(DocId), |
| {{p, Partition, Key}, DocId} |
| end, Rows). |
| |
| |
| update_id_btree(Btree, DocIdKeys, true) -> |
| ToAdd = [{Id, DIKeys} || {Id, DIKeys} <- DocIdKeys, DIKeys /= []], |
| couch_btree:query_modify(Btree, [], ToAdd, []); |
| update_id_btree(Btree, DocIdKeys, _) -> |
| ToFind = [Id || {Id, _} <- DocIdKeys], |
| ToAdd = [{Id, DIKeys} || {Id, DIKeys} <- DocIdKeys, DIKeys /= []], |
| ToRem = [Id || {Id, DIKeys} <- DocIdKeys, DIKeys == []], |
| couch_btree:query_modify(Btree, ToFind, ToAdd, ToRem). |
| |
| |
| collapse_rem_keys([], Acc) -> |
| Acc; |
| collapse_rem_keys([{ok, {DocId, ViewIdKeys}} | Rest], Acc) -> |
| NewAcc = lists:foldl(fun({ViewId, Key}, Acc2) -> |
| dict:append(ViewId, {Key, DocId}, Acc2) |
| end, Acc, ViewIdKeys), |
| collapse_rem_keys(Rest, NewAcc); |
| collapse_rem_keys([{not_found, _} | Rest], Acc) -> |
| collapse_rem_keys(Rest, Acc). |
| |
| |
| send_partial(Pid, State) when is_pid(Pid) -> |
| gen_server:cast(Pid, {new_state, State}); |
| send_partial(_, _) -> |
| ok. |
| |
| |
| update_task(NumChanges) -> |
| [Changes, Total] = couch_task_status:get([changes_done, total_changes]), |
| Changes2 = Changes + NumChanges, |
| Progress = case Total of |
| 0 -> |
| % updater restart after compaction finishes |
| 0; |
| _ -> |
| (Changes2 * 100) div Total |
| end, |
| couch_task_status:update([{progress, Progress}, {changes_done, Changes2}]). |
| |
| |
| maybe_notify(State, View, KVs, ToRem) -> |
| Updated = fun() -> |
| [Key || {{Key, _}, _} <- KVs] |
| end, |
| Removed = fun() -> |
| [Key || {Key, _DocId} <- ToRem] |
| end, |
| couch_index_plugin:index_update(State, View, Updated, Removed). |