virajjasani commented on a change in pull request #4028:
URL: https://github.com/apache/hadoop/pull/4028#discussion_r817419407



##########
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:
       @ayushtkn @tomscut There is nothing wrong with providing the utility as 
mentioned by Ayush above. I believe it is better to fail the test if we can not 
get 6 free ports for this UT. I will make the change.




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