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jinrongtong pushed a commit to branch 4.9.x
in repository https://gitbox.apache.org/repos/asf/rocketmq.git

commit c88686f13e6f4acef1f00c6d3e18589683ec3368
Author: tigerweili <[email protected]>
AuthorDate: Thu Jun 23 11:49:47 2022 +0800

    fix Namesrv auto discovery not work
---
 broker/src/main/java/org/apache/rocketmq/broker/out/BrokerOuterAPI.java | 2 +-
 .../src/main/java/org/apache/rocketmq/client/impl/MQClientAPIImpl.java  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git 
a/broker/src/main/java/org/apache/rocketmq/broker/out/BrokerOuterAPI.java 
b/broker/src/main/java/org/apache/rocketmq/broker/out/BrokerOuterAPI.java
index c5b53a777..df9b86649 100644
--- a/broker/src/main/java/org/apache/rocketmq/broker/out/BrokerOuterAPI.java
+++ b/broker/src/main/java/org/apache/rocketmq/broker/out/BrokerOuterAPI.java
@@ -86,7 +86,7 @@ public class BrokerOuterAPI {
     public String fetchNameServerAddr() {
         try {
             String addrs = this.topAddressing.fetchNSAddr();
-            if (addrs != null) {
+            if (addrs != null && !UtilAll.isBlank(addrs)) {
                 if (!addrs.equals(this.nameSrvAddr)) {
                     log.info("name server address changed, old: {} new: {}", 
this.nameSrvAddr, addrs);
                     this.updateNameServerAddressList(addrs);
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 5d7e1685e..bec1a5684 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
@@ -227,7 +227,7 @@ public class MQClientAPIImpl {
     public String fetchNameServerAddr() {
         try {
             String addrs = this.topAddressing.fetchNSAddr();
-            if (addrs != null) {
+            if (addrs != null && !UtilAll.isBlank(addrs)) {
                 if (!addrs.equals(this.nameSrvAddr)) {
                     log.info("name server address changed, old=" + 
this.nameSrvAddr + ", new=" + addrs);
                     this.updateNameServerAddressList(addrs);

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