dengzhhu653 commented on a change in pull request #2441:
URL: https://github.com/apache/hive/pull/2441#discussion_r683080884



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File path: 
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/RetryingHMSHandler.java
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@@ -61,6 +66,7 @@ public Result(Object result, int numRetries) {
 
   private final Configuration origConf;            // base configuration
   private final Configuration activeConf;  // active configuration
+  private final List<MetaStoreEndFunctionListener> endFunctionListeners; // 
the end function listener

Review comment:
       Thank you for the comments!
   The `startFunctions` could be eliminated for the reasons listing above, 
leaving the `MetaStoreEndFunctionListener` on `endFunction` that should be 
taken care of. Introducing a `MetaStoreFunctionListener` makes things much 
better and straightforward. A user can monitor the input or output of the 
method, or implement his own audit logics.
   This change also introduce some incompatibility in 
[MetaStoreEndFunctionContext](https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/MetaStoreEndFunctionContext.java#L55-L57),
 the `getInputTableName` would return null for the old implemention.
   




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