virajjasani commented on a change in pull request #4028:
URL: https://github.com/apache/hadoop/pull/4028#discussion_r816932592



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/qjournal/TestMiniJournalCluster.java
##########
@@ -52,4 +59,82 @@ public void testStartStop() throws IOException {
       c.shutdown();
     }
   }
+
+  @Test
+  public void testStartStopWithPorts() throws Exception {
+    Configuration conf = new Configuration();
+
+    LambdaTestUtils.intercept(
+        IllegalArgumentException.class,
+        "Num of http ports (1) should match num of JournalNodes (3)",
+        "MiniJournalCluster port validation failed",
+        () -> {
+          new MiniJournalCluster.Builder(conf).setHttpPorts(8481).build();
+        });
+
+    LambdaTestUtils.intercept(
+        IllegalArgumentException.class,
+        "Num of rpc ports (2) should match num of JournalNodes (3)",
+        "MiniJournalCluster port validation failed",
+        () -> {
+          new MiniJournalCluster.Builder(conf).setRpcPorts(8481, 8482).build();
+        });
+
+    LambdaTestUtils.intercept(
+        IllegalArgumentException.class,
+        "Num of rpc ports (1) should match num of JournalNodes (3)",
+        "MiniJournalCluster port validation failed",
+        () -> {
+          new MiniJournalCluster.Builder(conf).setHttpPorts(800, 9000, 
10000).setRpcPorts(8481)
+              .build();
+        });
+
+    LambdaTestUtils.intercept(
+        IllegalArgumentException.class,
+        "Num of http ports (4) should match num of JournalNodes (3)",
+        "MiniJournalCluster port validation failed",
+        () -> {
+          new MiniJournalCluster.Builder(conf).setHttpPorts(800, 9000, 1000, 
2000)
+              .setRpcPorts(8481, 8482, 8483).build();
+        });
+
+    final int[] httpPorts = new int[] { NetUtils.getFreeSocketPort(), 
NetUtils.getFreeSocketPort(),
+        NetUtils.getFreeSocketPort() };
+    final int[] rpcPorts = new int[] { NetUtils.getFreeSocketPort(), 
NetUtils.getFreeSocketPort(),
+        NetUtils.getFreeSocketPort() };

Review comment:
       I see the exact increments in the ports as per the logs:
   
   ```
   2022-03-01 20:08:22,504 [Listener at localhost/58862] INFO  
qjournal.TestMiniJournalCluster 
(TestMiniJournalCluster.java:testStartStopWithPorts(106)) - Http ports 
selected: [58873, 58874, 58875]
   2022-03-01 20:08:22,504 [Listener at localhost/58862] INFO  
qjournal.TestMiniJournalCluster 
(TestMiniJournalCluster.java:testStartStopWithPorts(107)) - Rpc ports selected: 
[58876, 58877, 58878]
   
   
   2022-03-01 21:53:55,768 [Listener at localhost/59292] INFO  
qjournal.TestMiniJournalCluster 
(TestMiniJournalCluster.java:testStartStopWithPorts(106)) - Http ports 
selected: [59302, 59303, 59304]
   2022-03-01 21:53:55,768 [Listener at localhost/59292] INFO  
qjournal.TestMiniJournalCluster 
(TestMiniJournalCluster.java:testStartStopWithPorts(107)) - Rpc ports selected: 
[59305, 59306, 59307]
   
   ```
   And so on..




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