xinglin commented on code in PR #5809:
URL: https://github.com/apache/hadoop/pull/5809#discussion_r1257544818
##########
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/extdataset/ExternalDatasetImpl.java:
##########
@@ -53,6 +53,7 @@ public class ExternalDatasetImpl implements
FsDatasetSpi<ExternalVolumeImpl> {
private final DatanodeStorage storage = new DatanodeStorage(
DatanodeStorage.generateUuid(), DatanodeStorage.State.NORMAL,
StorageType.DEFAULT);
+ private long lastDirScannerFinishTime;
Review Comment:
A lot of functions in this class are not implemented. I think we should
following the same pattern here.
getLastDirScannerFinishTime() -> return 0.
setLastDirScannerFinishTime() -> do nothing.
Below are functions related with Trash.
```
@Override
public void enableTrash(String bpid) {
}
@Override
public void clearTrash(String bpid) {
}
@Override
public boolean trashEnabled(String bpid) {
return false;
}
```
`SimulatedFSDataset.java `has a different implementation for enableTrash().
So, I guess we don't have to enforce the same implementation between
`SimulatedFSDataset` and `ExternalDatasetImpl`. I am fine with the current
change.
```
@Override
public void enableTrash(String bpid) {
throw new UnsupportedOperationException();
}
```
cc @Hexiaoqiao
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