jiangphcn commented on a change in pull request #1187: [WIP] Couchdb 3326 
clustered purge
URL: https://github.com/apache/couchdb/pull/1187#discussion_r173440032
 
 

 ##########
 File path: src/couch_index/src/couch_index_plugin_couch_db.erl
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 @@ -0,0 +1,42 @@
+% 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_index_plugin_couch_db).
+
+-export([
+    before_copy_purge_info/1
+]).
+
+-include_lib("couch/include/couch_db.hrl").
+-include_lib("couch_mrview/include/couch_mrview.hrl").
+
+
+before_copy_purge_info(DbName) ->
+    {ok, DDocs} = design_docs(DbName),
+    lists:map(fun(DDoc) ->
+        JsonDDoc = couch_doc:from_json_obj(DDoc),
+        couch_mrview_index:maybe_create_local_purge_doc(DbName, JsonDDoc)
 
 Review comment:
   Understand that we had better not to use `couch_mrview_index` in 
`couch_index` repository. I also tried with different approach. But didn't find 
more graceful way. Alternatively, I can try to make it configurable and open to 
any suggestions.
   
   The difficulty here is that this was called from 
https://github.com/apache/couchdb/pull/1187/commits/c5eb57ba4929182d46cd23973b37d895441e71c6#diff-6b8890f55c19eb040b25463764ed0a05R64
 where there is no context information about `couch_mrview_index`.  This is 
different calls triggered from `couch_mrview` repository and couch_mrview_index 
can be passed as `Mod`.

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