diff --git a/client/src/main/java/org/apache/rocketmq/client/impl/MQClientAPIImpl.java b/client/src/main/java/org/apache/rocketmq/client/impl/MQClientAPIImpl.java
index 6119e2483eb79c565b060874f5b103dbe5c2500a..ff25334fa9b41bc50fb6a2fe9676687874c24a27 100644
--- a/client/src/main/java/org/apache/rocketmq/client/impl/MQClientAPIImpl.java
+++ b/client/src/main/java/org/apache/rocketmq/client/impl/MQClientAPIImpl.java
@@ -593,12 +593,12 @@ public class MQClientAPIImpl {
                     }
                 } else {
                     if (!responseFuture.isSendRequestOK()) {
-                        pullCallback.onException(new MQClientException("send request failed", responseFuture.getCause()));
+                        pullCallback.onException(new MQClientException("send request failed to " + addr + ". Request: " + request, responseFuture.getCause()));
                     } else if (responseFuture.isTimeout()) {
-                        pullCallback.onException(new MQClientException("wait response timeout " + responseFuture.getTimeoutMillis() + "ms",
+                        pullCallback.onException(new MQClientException("wait response from " + addr + " timeout :" + responseFuture.getTimeoutMillis() + "ms" + ". Request: " + request,
                             responseFuture.getCause()));
                     } else {
-                        pullCallback.onException(new MQClientException("unknow reseaon", responseFuture.getCause()));
+                        pullCallback.onException(new MQClientException("unknown reason. addr: " + addr + ", timeoutMillis: " + timeoutMillis + ". Request: " + request, responseFuture.getCause()));
                     }
                 }
             }
diff --git a/client/src/main/java/org/apache/rocketmq/client/impl/factory/MQClientInstance.java b/client/src/main/java/org/apache/rocketmq/client/impl/factory/MQClientInstance.java
index 11266c4d154ff01c41812a117c0ec07e07e52eea..d7e02fe3ddcdb14d1907cb371bb707e803272034 100644
--- a/client/src/main/java/org/apache/rocketmq/client/impl/factory/MQClientInstance.java
+++ b/client/src/main/java/org/apache/rocketmq/client/impl/factory/MQClientInstance.java
@@ -596,7 +596,7 @@ public class MQClientInstance {
                                     }
                                 }
                             }
-                            log.info("topicRouteTable.put TopicRouteData[{}]", cloneTopicRouteData);
+                            log.info("topicRouteTable.put. Topic = {}, TopicRouteData[{}]", topic, cloneTopicRouteData);
                             this.topicRouteTable.put(topic, cloneTopicRouteData);
                             return true;
                         }
diff --git a/remoting/src/main/java/org/apache/rocketmq/remoting/netty/NettyRemotingClient.java b/remoting/src/main/java/org/apache/rocketmq/remoting/netty/NettyRemotingClient.java
index 85f9244d2d08e585efd4e0f9d81d693d0dd00d01..26088aa5a5b98aad899e4215e7e342e6037c41a6 100644
--- a/remoting/src/main/java/org/apache/rocketmq/remoting/netty/NettyRemotingClient.java
+++ b/remoting/src/main/java/org/apache/rocketmq/remoting/netty/NettyRemotingClient.java
@@ -321,6 +321,7 @@ public class NettyRemotingClient extends NettyRemotingAbstract implements Remoti
 
             if (update) {
                 Collections.shuffle(addrs);
+                log.info("name server address updated. NEW : {} , OLD: {}",addrs,old);
                 this.namesrvAddrList.set(addrs);
             }
         }
@@ -398,6 +399,7 @@ public class NettyRemotingClient extends NettyRemotingAbstract implements Remoti
                         String newAddr = addrList.get(index);
 
                         this.namesrvAddrChoosed.set(newAddr);
+                        log.info("new name server is chosen. OLD: {} , NEW: {}. namesrvIndex = {}", addr, newAddr, namesrvIndex);
                         Channel channelNew = this.createChannel(newAddr);
                         if (channelNew != null)
                             return channelNew;