jiangphcn commented on a change in pull request #1370: [5/5] Clustered Purge 
Implementation
URL: https://github.com/apache/couchdb/pull/1370#discussion_r195009936
 
 

 ##########
 File path: src/couch_mrview/src/couch_mrview_util.erl
 ##########
 @@ -41,6 +43,27 @@
 -include_lib("couch_mrview/include/couch_mrview.hrl").
 
 
+get_local_purge_doc_id(Sig) ->
+    Version = "v" ++ config:get("purge", "version", "1") ++ "-",
+    ?l2b(?LOCAL_DOC_PREFIX ++ "purge-" ++ Version ++ "mrview-" ++ Sig).
+
+
+get_value_from_options(Key, Options) ->
+    case couch_util:get_value(Key, Options) of
+        undefined ->
+            Reason = binary_to_list(Key) ++ " must exist in Options.",
+            throw({bad_request, Reason});
+        Value -> Value
+    end.
+
+
+get_signature_from_filename(FileName) ->
+    FilePathList = filename:split(FileName),
+    [PureFN] = lists:nthtail(length(FilePathList) - 1, FilePathList),
 
 Review comment:
   Good suggestion, and changed in commit 3e95dcc 

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