ayushtkn commented on code in PR #5809:
URL: https://github.com/apache/hadoop/pull/5809#discussion_r1261357967


##########
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDirectoryScanner.java:
##########
@@ -1304,6 +1305,23 @@ public void testLocalReplicaUpdateWithReplica() throws 
Exception {
     assertEquals(realBlkFile, localReplica.getBlockFile());
   }
 
+  @Test(timeout = 60000)
+  public void testLastDirScannerFinishTimeIsUpdated() throws Exception {
+    Configuration conf = getConfiguration();
+    conf.setLong(DFSConfigKeys.DFS_DATANODE_DIRECTORYSCAN_INTERVAL_KEY, 3L);
+    cluster = new MiniDFSCluster.Builder(conf).build();
+    try {
+      cluster.waitActive();
+      bpid = cluster.getNamesystem().getBlockPoolId();
+      fds = DataNodeTestUtils.getFSDataset(cluster.getDataNodes().get(0));
+      assertEquals(fds.getLastDirScannerFinishTime(), 0L);
+      Thread.sleep(4000);
+      assertNotEquals(0L, fds.getLastDirScannerFinishTime());
+    } finally {
+      cluster.shutdown();
+    }
+  }
+

Review Comment:
   can we rather than doing this sleep thing, have a test like this
   ```
     @Test(timeout = 60000)
     public void testLastDirScannerFinishTimeIsUpdated() throws Exception {
       Configuration conf = getConfiguration();
       cluster = new MiniDFSCluster.Builder(conf).build();
       try {
         cluster.waitActive();
         bpid = cluster.getNamesystem().getBlockPoolId();
         final DataNode dn = cluster.getDataNodes().get(0);
         fds = DataNodeTestUtils.getFSDataset(dn);
         long lastDirScannerFinishTime = fds.getLastDirScannerFinishTime();
         dn.getDirectoryScanner().run();
         assertNotEquals(lastDirScannerFinishTime, 
fds.getLastDirScannerFinishTime());
       } finally {
         cluster.shutdown();
       }
     }
   ```



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