jiangphcn commented on a change in pull request #1370: [5/5] Clustered Purge 
Implementation
URL: https://github.com/apache/couchdb/pull/1370#discussion_r194951839
 
 

 ##########
 File path: src/couch/src/couch_db.erl
 ##########
 @@ -369,8 +379,145 @@ get_full_doc_info(Db, Id) ->
 get_full_doc_infos(Db, Ids) ->
     couch_db_engine:open_docs(Db, Ids).
 
-purge_docs(#db{main_pid=Pid}, IdsRevs) ->
-    gen_server:call(Pid, {purge_docs, IdsRevs}).
+purge_docs(Db, IdRevs) ->
+    purge_docs(Db, IdRevs, []).
+
+-spec purge_docs(#db{}, [{UUId, Id, [Rev]}], [PurgeOption]) ->
+    {ok, [Reply]} when
+    UUId :: binary(),
+    Id :: binary(),
+    Rev :: {non_neg_integer(), binary()},
+    PurgeOption :: interactive_edit | replicated_changes,
+    Reply :: {ok, []} | {ok, [Rev]}.
+purge_docs(#db{main_pid = Pid} = Db, UUIDsIdsRevs, Options) ->
+    % Check here if any UUIDs already exist when
+    % we're not replicating purge infos
+    IsRepl = lists:member(replicated_changes, Options),
+    if IsRepl -> ok; true ->
+        UUIDs = [UUID || {UUID, _, _} <- UUIDsIdsRevs],
+        lists:foreach(fun(Resp) ->
+            if Resp == not_found -> ok; true ->
+                Fmt = "Duplicate purge info UIUD: ~s",
+                Reason = io_lib:format(Fmt, [element(2, Resp)]),
+                throw({badreq, Reason})
+            end
+        end, get_purge_infos(Db, UUIDs))
+    end,
+    increment_stat(Db, [couchdb, database_purges]),
+    gen_server:call(Pid, {purge_docs, UUIDsIdsRevs, Options}).
+
+-spec get_purge_infos(#db{}, [UUId]) -> [PurgeInfo] when
+    UUId :: binary(),
+    PurgeInfo :: {PurgeSeq, UUId, Id, [Rev]} | not_found,
+    PurgeSeq :: non_neg_integer(),
+    Id :: binary(),
+    Rev :: {non_neg_integer(), binary()}.
+get_purge_infos(Db, UUIDs) ->
+    couch_db_engine:load_purge_infos(Db, UUIDs).
+
+
+get_minimum_purge_seq(#db{} = Db) ->
+    PurgeSeq = couch_db_engine:get_purge_seq(Db),
+    OldestPurgeSeq = couch_db_engine:get_oldest_purge_seq(Db),
+    PurgeInfosLimit = couch_db_engine:get_purge_infos_limit(Db),
+
+    FoldFun = fun(#doc{id = DocId, body = {Props}}, SeqAcc) ->
+        case DocId of
+            <<"_local/purge-", _/binary>> ->
+                ClientSeq = couch_util:get_value(<<"purge_seq">>, Props),
+                case ClientSeq of
+                    CS when is_integer(CS), CS >= PurgeSeq - PurgeInfosLimit ->
+                        {ok, SeqAcc};
+                    CS when is_integer(CS) ->
+                        case purge_client_exists(Db, DocId, Props) of
+                            true -> {ok, erlang:min(CS, SeqAcc)};
+                            false -> {ok, SeqAcc}
+                        end;
+                    _ ->
+                        % If there's a broken doc we have to keep every
+                        % purge info until the doc is fixed or removed.
+                        Fmt = "Invalid purge doc '~s' with purge_seq '~w'",
+                        couch_log:error(Fmt, [DocId, ClientSeq]),
+                        {ok, erlang:min(OldestPurgeSeq, SeqAcc)}
+                end;
+            _ ->
+                {stop, SeqAcc}
+        end
+    end,
+    InitMinSeq = PurgeSeq - PurgeInfosLimit,
+    Opts = [
+        {start_key, list_to_binary(?LOCAL_DOC_PREFIX ++ "purge-")}
 
 Review comment:
   Good suggestion. I changed code to use `?LOCAL_DOC_PREFIX` in `FoldFun` as 
well.

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