HDFS-15496. Add UI for deleted snapshots (#2212)

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/SnapshotStatus.java

@@ -174,60 +174,6 @@ public class SnapshotStatus {
     return Math.max(n, String.valueOf(value).length());
   }
 
-  /**
-   * To be used to for collection of snapshot jmx.
-   */
-  public static class Bean {
-    private final String path;
-    private final int snapshotID;
-    private final long modificationTime;
-    private final short permission;
-    private final String owner;
-    private final String group;
-    private final boolean isDeleted;
-
-
-    public Bean(String path, int snapshotID, long
-        modificationTime, short permission, String owner, String group,
-                boolean isDeleted) {
-      this.path = path;
-      this.snapshotID = snapshotID;
-      this.modificationTime = modificationTime;
-      this.permission = permission;
-      this.owner = owner;
-      this.group = group;
-      this.isDeleted = isDeleted;
-    }
-
-    public String getPath() {
-      return path;
-    }
-
-    public int getSnapshotID() {
-      return snapshotID;
-    }
-
-    public long getModificationTime() {
-      return modificationTime;
-    }
-
-    public short getPermission() {
-      return permission;
-    }
-
-    public String getOwner() {
-      return owner;
-    }
-
-    public String getGroup() {
-      return group;
-    }
-
-    public boolean isDeleted() {
-      return isDeleted;
-    }
-  }
-
   static String getSnapshotPath(String snapshottableDir,
                                 String snapshotRelativePath) {
     String parentFullPathStr =

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/SnapshotInfo.java

@@ -82,18 +82,20 @@ public class SnapshotInfo {
   }
 
   public static class Bean {
-    private final String snapshotID;
+    private final int snapshotID;
     private final String snapshotDirectory;
     private final long modificationTime;
+    private final String status;
 
-    public Bean(String snapshotID, String snapshotDirectory,
-        long modificationTime) {
+    public Bean(int snapshotID, String snapshotDirectory,
+        long modificationTime, boolean isMarkedAsDeleted) {
       this.snapshotID = snapshotID;
       this.snapshotDirectory = snapshotDirectory;
       this.modificationTime = modificationTime;
+      this.status = isMarkedAsDeleted ? "DELETED" : "ACTIVE";
     }
 
-    public String getSnapshotID() {
+    public int getSnapshotID() {
       return snapshotID;
     }
 
@@ -104,5 +106,9 @@ public class SnapshotInfo {
     public long getModificationTime() {
       return modificationTime;
     }
+
+    public String getStatus() {
+      return status;
+    }
   }
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/SnapshotManager.java

@@ -746,16 +746,19 @@ public class SnapshotManager implements SnapshotStatsMXBean {
         d.getDirectorySnapshottableFeature().getNumSnapshots(),
         d.getDirectorySnapshottableFeature().getSnapshotQuota(),
         d.getModificationTime(),
-        Short.valueOf(Integer.toOctalString(
-            d.getFsPermissionShort())),
+        Short.parseShort(Integer.toOctalString(d.getFsPermissionShort())),
         d.getUserName(),
         d.getGroupName());
   }
 
   public static SnapshotInfo.Bean toBean(Snapshot s) {
+    Snapshot.Root dir = s.getRoot();
     return new SnapshotInfo.Bean(
-        s.getRoot().getLocalName(), s.getRoot().getFullPathName(),
-        s.getRoot().getModificationTime());
+        s.getId(),
+        dir.getFullPathName(),
+        dir.getModificationTime(),
+        dir.isMarkedAsDeleted()
+        );
   }
 
   private List<INodeDirectory> getSnapshottableDirsForGc() {

hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/dfshealth.html

@@ -287,6 +287,7 @@
       <th>Snapshot ID</th>
       <th>Snapshot Directory</th>
       <th>Modification Time</th>
+      <th>Status</th>
     </tr>
   </thead>
   {#Snapshots}
@@ -294,6 +295,7 @@
     <td>{snapshotID}</td>
     <td>{snapshotDirectory}</td>
     <td>{modificationTime|date_tostring}</td>
+    <td>{status}</td>
   </tr>
   {/Snapshots}
 </table>