bereng commented on a change in pull request #870:
URL: https://github.com/apache/cassandra/pull/870#discussion_r572602851



##########
File path: 
test/unit/org/apache/cassandra/cql3/validation/operations/AlterTest.java
##########
@@ -269,6 +276,63 @@ public void testCreateAlterKeyspaces() throws Throwable
                                   "max_threshold", "32")));
     }
 
+    @Test
+    public void testCreateAlterKeyspacesRFWarnings() throws Throwable
+    {
+        requireNetwork();
+        Thread.sleep(1000); // Hack: requireNetwork() will clear warnings 
async so give some time to complete

Review comment:
       I disagree here. A person debugging the test will be under the 
impression the poll guarantees the 0 warnings which is not true. A sleep 
signals a _best effort_ to workaround an async issue as in other tests. The 
'expected 0 warnings at the start of the test' is implicit in the assert 
expecting only 1 warning.




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