[GitHub] [pinot] KKcorps commented on a diff in pull request #10326: Provide results in CompletableFuture for java clients and expose metrics

["KKcorps (via GitHub)" <gi...@apache.org>]

KKcorps commented on code in PR #10326:
URL: https://github.com/apache/pinot/pull/10326#discussion_r1117403802


##########
pinot-clients/pinot-java-client/src/main/java/org/apache/pinot/client/PinotClientTransport.java:
##########
@@ -18,28 +18,38 @@
  */
 package org.apache.pinot.client;
 
-import java.util.concurrent.Future;
+import java.util.concurrent.CompletableFuture;
 
 
 /**
  * Interface for plugging different client transports.
  */
-public interface PinotClientTransport {
+public interface PinotClientTransport<METRICS> {
 
   BrokerResponse executeQuery(String brokerAddress, String query)
       throws PinotClientException;
 
-  Future<BrokerResponse> executeQueryAsync(String brokerAddress, String query)
+  CompletableFuture<BrokerResponse> executeQueryAsync(String brokerAddress, String query)
       throws PinotClientException;
 
   @Deprecated
   BrokerResponse executeQuery(String brokerAddress, Request request)
       throws PinotClientException;
 
   @Deprecated
-  Future<BrokerResponse> executeQueryAsync(String brokerAddress, Request request)
+  CompletableFuture<BrokerResponse> executeQueryAsync(String brokerAddress, Request request)
       throws PinotClientException;
 
   void close()
       throws PinotClientException;
+
+  /**
+   * Access to the client metrics implementation if any.
+   * This may be useful for observability into the client implementation.
+   *
+   * @return underlying client metrics if any
+   */
+  default METRICS getClientMetrics() {
+    return null;

Review Comment:
   Better to throw `UnsupportedOperationException` here rather than returning null.



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