[ISSUE #9807] Optimize log.warn Time Consumption in the send Method (#9808)

Author: yx9o

client/src/main/java/org/apache/rocketmq/client/impl/producer/DefaultMQProducerImpl.java

@@ -809,7 +809,9 @@ private SendResult sendDefaultImpl(
                         endTimestamp = System.currentTimeMillis();
                         this.updateFaultItem(mq.getBrokerName(), endTimestamp - beginTimestampPrev, false, true);
                         log.warn("sendKernelImpl exception, resend at once, InvokeID: {}, RT: {}ms, Broker: {}", invokeID, endTimestamp - beginTimestampPrev, mq, e);
-                        log.warn(msg.toString());
+                        if (log.isDebugEnabled()) {
+                            log.debug(msg.toString());
+                        }
                         exception = e;
                         continue;
                     } catch (RemotingException e) {