zentol commented on code in PR #21719:
URL: https://github.com/apache/flink/pull/21719#discussion_r1073586212


##########
flink-tests/src/test/java/org/apache/flink/test/runtime/IPv6HostnamesITCase.java:
##########
@@ -146,15 +145,13 @@ private Inet6Address getLocalIPv6Address() {
 
                             // test whether Akka's netty can bind to the 
address
                             log.info("Testing whether Akka can use " + addr);
-                            try (NetUtils.Port port = 
NetUtils.getAvailablePort()) {
-                                final RpcService rpcService =
-                                        RpcSystem.load()
-                                                .localServiceBuilder(new 
Configuration())
-                                                
.withBindAddress(addr.getHostAddress())
-                                                .withBindPort(port.getPort())
-                                                .createAndStart();
-                                rpcService.closeAsync().get();
-                            }
+                            final RpcService rpcService =
+                                    RpcSystem.load()
+                                            .remoteServiceBuilder(new 
Configuration(), null, "8081")

Review Comment:
   the external port doesnt really matter here since we explicitly set a bind 
port, due to which the external port is only used for advertising.



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