turboFei commented on a change in pull request #27943: [SPARK-31179] Fast fail 
the connection while last connection failed in fast fail time window
URL: https://github.com/apache/spark/pull/27943#discussion_r398562861
 
 

 ##########
 File path: 
common/network-common/src/test/java/org/apache/spark/network/client/TransportClientFactorySuite.java
 ##########
 @@ -224,4 +226,23 @@ public void closeFactoryBeforeCreateClient() throws 
IOException, InterruptedExce
     factory.close();
     factory.createClient(TestUtils.getLocalHost(), server1.getPort());
   }
+
+  @Rule
+  public ExpectedException expectedException = ExpectedException.none();
+
+  @Test
+  public void fastFailConnectionInTimeWindow() throws IOException, 
InterruptedException {
+    TransportClientFactory factory = context.createClientFactory();
+    TransportServer server = context.createServer();
+    server.close();
+    int unreachablePort = server.getPort();
 
 Review comment:
   I think It is not necessary.
   I have checked the code, the port would only been set during init()

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