HDFS-16192: ViewDistributedFileSystem#rename wrongly using src in the place of dst.

Author: umagangumalla

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileUtil.java

@@ -1872,4 +1872,19 @@ public static FileContext write(final FileContext fileContext,
       final Path path, final CharSequence charseq) throws IOException {
     return write(fileContext, path, charseq, StandardCharsets.UTF_8);
   }
+
+  @InterfaceAudience.LimitedPrivate({"ViewDistributedFileSystem"})
+  @InterfaceStability.Unstable
+  /**
+   * Used in ViewDistributedFileSystem rename API to get access to the protected
+   * API of FileSystem interface. Even though Rename with options API
+   * deprecated, we are still using as part of trash. If any filesystem provided
+   * implementation to this protected FileSystem API, we can't invoke it with
+   * out casting to the specific filesystem. This util method is proposed to get
+   * the access to FileSystem#rename with options.
+   */
+  public static void rename(FileSystem srcFs, Path src, Path dst,
+      final Options.Rename... options) throws IOException {
+    srcFs.rename(src, dst, options);
+  }
 }

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

@@ -33,6 +33,7 @@
 import org.apache.hadoop.fs.FileEncryptionInfo;
 import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.FileUtil;
 import org.apache.hadoop.fs.FsServerDefaults;
 import org.apache.hadoop.fs.FsStatus;
 import org.apache.hadoop.fs.LocatedFileStatus;
@@ -537,14 +538,11 @@ public void rename(Path src, Path dst, final Options.Rename... options)
       return;
     }
 
-    // TODO: revisit
     ViewFileSystemOverloadScheme.MountPathInfo<FileSystem> mountSrcPathInfo =
         this.vfs.getMountPathInfo(src, getConf());
-    checkDFS(mountSrcPathInfo.getTargetFs(), "rename");
 
     ViewFileSystemOverloadScheme.MountPathInfo<FileSystem> mountDstPathInfo =
-        this.vfs.getMountPathInfo(src, getConf());
-    checkDFS(mountDstPathInfo.getTargetFs(), "rename");
+        this.vfs.getMountPathInfo(dst, getConf());
 
     //Check both in same cluster.
     if (!mountSrcPathInfo.getTargetFs().getUri()
@@ -553,9 +551,9 @@ public void rename(Path src, Path dst, final Options.Rename... options)
           "Can't rename across file systems.");
     }
 
-    ((DistributedFileSystem) mountSrcPathInfo.getTargetFs())
-        .rename(mountSrcPathInfo.getPathOnTarget(),
-            mountDstPathInfo.getPathOnTarget(), options);
+    FileUtil.rename(mountSrcPathInfo.getTargetFs(),
+        mountSrcPathInfo.getPathOnTarget(), mountDstPathInfo.getPathOnTarget(),
+        options);
   }
 
   @Override

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestViewDistributedFileSystem.java

@@ -20,11 +20,13 @@
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.CommonConfigurationKeys;
 import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Options;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.PathHandle;
 import org.apache.hadoop.fs.viewfs.ConfigUtil;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.test.Whitebox;
+import org.junit.Assert;
 import org.junit.Test;
 
 import java.io.IOException;
@@ -89,4 +91,29 @@ public void testEmptyDelegationToken() throws IOException {
       }
     }
   }
+
+  @Test
+  public void testRenameWithOptions() throws IOException {
+    Configuration conf = getTestConfiguration();
+    MiniDFSCluster cluster = null;
+    try {
+      cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
+      URI defaultUri =
+          URI.create(conf.get(CommonConfigurationKeys.FS_DEFAULT_NAME_KEY));
+      conf.set("fs.viewfs.mounttable." + defaultUri.getHost() + ".linkFallback",
+          defaultUri.toString());
+      conf.setLong(CommonConfigurationKeys.FS_TRASH_INTERVAL_KEY, 30000);
+      try (ViewDistributedFileSystem fileSystem = (ViewDistributedFileSystem) FileSystem.get(conf)) {
+        final Path testDir = new Path("/test");
+        final Path renameDir = new Path("/testRename");
+        fileSystem.mkdirs(testDir);
+        fileSystem.rename(testDir, renameDir, Options.Rename.TO_TRASH);
+        Assert.assertTrue(fileSystem.exists(renameDir));
+      }
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
 }