[GitHub] [couchdb] nickva commented on a change in pull request #1972: Introduce Shard Splitting To CouchDB

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nickva commented on a change in pull request #1972: Introduce Shard Splitting To CouchDB
URL: https://github.com/apache/couchdb/pull/1972#discussion_r265677665
 
 

 ##########
 File path: src/couch/src/couch_db_engine.erl
 ##########
 @@ -465,6 +474,13 @@
         {ok, NewDbHandle::db_handle()}.
 
 
+% This function should be called from a single threaded context and
+% should be used to copy purge infos from on database to another
+% when copying a database
+-callback copy_purge_infos(DbHandle::db_handle(), [purge_info()]) ->
+        {ok, NewDbHandle::db_handle()}.
 
 Review comment:
   It's two level to match match existing indentation for callbacks specs. (Two levels for the response to break it up from one level indentation for when the function head is too long).

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