[GitHub] [couchdb] jiangphcn commented on a change in pull request #2707: Set DbPrefix with value allocated by erlfdb_hca

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jiangphcn commented on a change in pull request #2707: Set DbPrefix with value allocated by erlfdb_hca
URL: https://github.com/apache/couchdb/pull/2707#discussion_r396870210
 
 

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 File path: src/fabric/src/fabric2_fdb.erl
 ##########
 @@ -177,10 +177,13 @@ create(#{} = Db0, Options) ->
         layer_prefix := LayerPrefix
     } = Db = ensure_current(Db0, false),
 
-    % Eventually DbPrefix will be HCA allocated. For now
-    % we're just using the DbName so that debugging is easier.
     DbKey = erlfdb_tuple:pack({?ALL_DBS, DbName}, LayerPrefix),
-    DbPrefix = erlfdb_tuple:pack({?DBS, DbName}, LayerPrefix),
+    DefDbPref = ?DEFAULT_DB_PREFIX,
+    AllDbPrefix = erlfdb_util:get(Options, db_prefix, DefDbPref),
+    DbId = erlfdb_tuple:pack({AllDbPrefix}, AllDbPrefix),
+    DbPrefixAllocator = erlfdb_hca:create(erlfdb_tuple:pack({DbId}, <<"hca">>)),
+    AllocPrefix = erlfdb_hca:allocate(DbPrefixAllocator, Tx),
+    DbPrefix = erlfdb_tuple:pack({?DBS, AllocPrefix}, LayerPrefix),
 
 Review comment:
   thanks @nickva and @davisp. I simplified creation of HCA according to your suggestion.

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