deniskuzZ commented on code in PR #4444:
URL: https://github.com/apache/hive/pull/4444#discussion_r1238217098


##########
ql/src/java/org/apache/hadoop/hive/ql/metadata/Hive.java:
##########
@@ -5700,11 +5701,26 @@ public HiveMetaHook getHook(
       }
     };
 
-    if (conf.getBoolVar(ConfVars.METASTORE_FASTPATH)) {
-      return new SessionHiveMetaStoreClient(conf, hookLoader, allowEmbedded);
-    } else {
-      return RetryingMetaStoreClient.getProxy(conf, hookLoader, 
metaCallTimeMap,
-          SessionHiveMetaStoreClient.class.getName(), allowEmbedded);
+    return createMetaStoreClientFactory(conf)
+        .createMetaStoreClient(conf, hookLoader, allowEmbedded, 
metaCallTimeMap);
+  }
+
+  private static HiveMetaStoreClientFactory 
createMetaStoreClientFactory(HiveConf conf) throws
+          MetaException {
+    String metaStoreClientFactoryClassName = MetastoreConf.getVar(conf,
+        MetastoreConf.ConfVars.METASTORE_CLIENT_FACTORY_CLASS);

Review Comment:
   I think instead of providing a custom factory, you need to supply the custom 
client impl (`SessionHiveMetaStoreClient`, `RetryingMetaStoreClient`, etc). 
Please take a look at 
https://github.com/apache/hive/pull/4257/files#diff-6561f3987ba0c11e6a8998efcdc862d3d3340d4babbe003ae8da98b1e4020faf
  
   cc @wecharyu 



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