Do not send heartbeat for every pull request

client/src/main/java/org/apache/rocketmq/client/impl/factory/MQClientInstance.java

@@ -1046,20 +1046,8 @@ public class MQClientInstance {
             if (this.brokerVersionTable.get(brokerName).containsKey(brokerAddr)) {
                 return this.brokerVersionTable.get(brokerName).get(brokerAddr);
             }
-        } else {
-            HeartbeatData heartbeatData = prepareHeartbeatData();
-            try {
-                int version = this.mQClientAPIImpl.sendHearbeat(brokerAddr, heartbeatData, 3000);
-                return version;
-            } catch (Exception e) {
-                if (this.isBrokerInNameServer(brokerAddr)) {
-                    log.info("send heart beat to broker[{} {}] failed", brokerName, brokerAddr);
-                } else {
-                    log.info("send heart beat to broker[{} {}] exception, because the broker not up, forget it", brokerName,
-                        brokerAddr);
-                }
-            }
         }
+        //To do need to fresh the version
         return 0;
     }