yifan-c commented on code in PR #1706:
URL: https://github.com/apache/cassandra/pull/1706#discussion_r1110196443


##########
test/distributed/org/apache/cassandra/distributed/test/InternodeEncryptionEnforcementTest.java:
##########
@@ -103,16 +100,12 @@ public void 
testOutboundConnectionsAreRejectedWhenAuthFails() throws IOException
             executorService.submit(() -> openConnections(cluster));
 
             /*
-             * instance (1) should not connect to instance (2) as 
authentication fails;
-             * instance (2) should not connect to instance (1) as 
authentication fails.
+             * Instance (1) should not be able to make outbound connections to 
instance (2) but Instance (2) should be
+             * accepting outbound connections from Instance (1)

Review Comment:
   The comment is confusing to me.. 
   If instance 1 can never make outbound connections, how can instance 2 expect 
connections _from_ instance 1? Do you mean instance 2 can make outbound 
connections _to_ instance 1?



##########
test/distributed/org/apache/cassandra/distributed/test/InternodeEncryptionEnforcementTest.java:
##########
@@ -134,19 +125,14 @@ public void 
testOutboundConnectionsAreRejectedWhenAuthFails() throws IOException
     public void testOutboundConnectionsAreInterruptedWhenAuthFails() throws 
IOException, TimeoutException
     {
         Cluster.Builder builder = 
createCluster(AllowFirstAndRejectOtherOutboundAuthenticator.class);
+        final ExecutorService executorService = 
Executors.newSingleThreadExecutor();
+
         try (Cluster cluster = builder.start())

Review Comment:
   nit: it is safer to close the `ExecutorService` along with `cluster`. 
Otherwise, if the body of `try` throws, only `cluster` is closed, but 
`executorService.shutdown()` will not be called. 
   
   You can have multiple `closable`s in the try-with-resources statement, and 
remove `executorService.shutdown()` at the end of the test.
   ```
   try (Cluster cluster = builder.start(); AutoCloseable es = 
executorService::shutdown)
   ```



##########
test/distributed/org/apache/cassandra/distributed/test/InternodeEncryptionEnforcementTest.java:
##########
@@ -86,8 +84,7 @@ public void testInboundConnectionsAreRejectedWhenAuthFails() 
throws IOException,
             // Wait for authentication to fail
             cluster.get(1).logs().watchFor("Unable to authenticate peer");
             cluster.get(1).runOnInstance(runnable);
-            cluster.get(2).logs().watchFor("Unable to authenticate peer");
-            cluster.get(2).runOnInstance(runnable);

Review Comment:
   nit: how about adding a watch for "Connection reset by peer" in instances 
2's log?
   
   ```
               cluster.get(2).logs().watchFor("Connection reset by peer");
   ```



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