hfutatzhanghb commented on code in PR #5809:
URL: https://github.com/apache/hadoop/pull/5809#discussion_r1257219915


##########
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalDatasetImpl.java:
##########
@@ -477,4 +482,7 @@ public MountVolumeMap getMountVolumeMap() {
   public List<FsVolumeImpl> getVolumeList() {
     return null;
   }
+
+  @Override
+  public void setLastDirScannerFinishTime(long time) {}

Review Comment:
   @xinglin Hi, sir. I do not know why exacltly, but i think the 
SimulatedFSDataset is just for simplifing test. if we make both behave the same 
way, there is no need to have class SimulatedFSDataset. What's your idea?Thanks 
a lot.



##########
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalDatasetImpl.java:
##########
@@ -477,4 +482,7 @@ public MountVolumeMap getMountVolumeMap() {
   public List<FsVolumeImpl> getVolumeList() {
     return null;
   }
+
+  @Override
+  public void setLastDirScannerFinishTime(long time) {}

Review Comment:
   @xinglin Hi, sir. I do not know why exacltly, but i think the 
SimulatedFSDataset is just for simplifing test. if we make both behave the same 
way, there is no need to have class SimulatedFSDataset. What's your idea?Thanks 
a lot.



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