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https://issues.apache.org/jira/browse/ROCKETMQ-335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16294821#comment-16294821
 ] 

ASF GitHub Bot commented on ROCKETMQ-335:
-----------------------------------------

zhouxinyu commented on a change in pull request #207: [ROCKETMQ-335] Reload 
server certificate, private key and root ca when these are changed
URL: https://github.com/apache/rocketmq/pull/207#discussion_r157457052
 
 

 ##########
 File path: 
broker/src/main/java/org/apache/rocketmq/broker/BrokerController.java
 ##########
 @@ -387,6 +391,45 @@ public void run() {
                     }
                 }, 1000 * 10, 1000 * 60, TimeUnit.MILLISECONDS);
             }
+
+            if (TlsSystemConfig.tlsMode != TlsMode.DISABLED) {
+                // Register a listener to reload SslContext
+                try {
+                    fileWatchService = new FileWatchService(
+                        new String[] {
+                            TlsSystemConfig.tlsServerCertPath,
+                            TlsSystemConfig.tlsServerKeyPath,
+                            TlsSystemConfig.tlsServerTrustCertPath
+                        },
+                        new FileWatchService.Listener() {
+                            boolean certChanged, keyChanged = false;
+                            @Override
+                            public void onChanged(String path) {
+                                if 
(path.equals(TlsSystemConfig.tlsServerTrustCertPath)) {
+                                    log.info("The trust certificate changed, 
reload the ssl context");
+                                    reloadServerSslContext();
+                                }
+                                if 
(path.equals(TlsSystemConfig.tlsServerCertPath)) {
+                                    certChanged = true;
+                                }
+                                if 
(path.equals(TlsSystemConfig.tlsServerKeyPath)) {
+                                    keyChanged = true;
+                                }
+                                if (certChanged && keyChanged) {
 
 Review comment:
   But if both certificate and private key are changed, there may have an 
inconsistent period which will result in server unavailable.
   
   And in most cases, certificate and private key will be refreshed at the same 
time. 
   
   BTW, there is a better solution that reloads only when certificate and 
private key are matched,  but it's more complicated, considering the various 
security algorithm.
   
   So, this is a tradeoff way, simple and effective.

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> Reload server certificate, private key and root ca when these are changed
> -------------------------------------------------------------------------
>
>                 Key: ROCKETMQ-335
>                 URL: https://issues.apache.org/jira/browse/ROCKETMQ-335
>             Project: Apache RocketMQ
>          Issue Type: Improvement
>          Components: rocketmq-broker, rocketmq-namesrv, rocketmq-remoting
>            Reporter: yukon
>            Assignee: yukon
>             Fix For: 4.3.0
>
>
> Tls is supported in 4.2.0, but it doesn't support reload server certificate, 
> private key and root ca when these are changed.
> This feature can allow us to update the TLS pem files without downtime.



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