HDFS-16024. RBF: Rename data to the Trash should be based on src location (#4962)

(cherry picked from commit e18d806212)

Reviewed-by: Dinesh Chitlangia <dineshc@apache.org>
Signed-off-by: Akira Ajisaka <aajisaka@apache.org>

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/resolver/MountTableResolver.java

@@ -45,11 +45,15 @@ import java.util.concurrent.ExecutionException;
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReadWriteLock;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
+import java.util.regex.Pattern;
+import java.util.ArrayList;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.hdfs.server.federation.resolver.order.DestinationOrder;
 import org.apache.hadoop.hdfs.server.federation.router.Router;
+import org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer;
 import org.apache.hadoop.hdfs.server.federation.store.MountTableStore;
 import org.apache.hadoop.hdfs.server.federation.store.StateStoreCache;
 import org.apache.hadoop.hdfs.server.federation.store.StateStoreService;
@@ -104,6 +108,8 @@ public class MountTableResolver
   private final Lock readLock = readWriteLock.readLock();
   private final Lock writeLock = readWriteLock.writeLock();
 
+  /** Trash Current matching pattern. */
+  private static final String TRASH_PATTERN = "/(Current|[0-9]+)";
 
   @VisibleForTesting
   public MountTableResolver(Configuration conf) {
@@ -337,6 +343,52 @@ public class MountTableResolver
     this.init = true;
   }
 
+  /**
+   * Check if PATH is the trail associated with the Trash.
+   *
+   * @param path A path.
+   */
+  @VisibleForTesting
+  public static boolean isTrashPath(String path) throws IOException {
+    Pattern pattern = Pattern.compile(
+        "^" + getTrashRoot() + TRASH_PATTERN + "/");
+    return pattern.matcher(path).find();
+  }
+
+  @VisibleForTesting
+  public static String getTrashRoot() throws IOException {
+    // Gets the Trash directory for the current user.
+    return FileSystem.USER_HOME_PREFIX + "/" +
+        RouterRpcServer.getRemoteUser().getUserName() + "/" +
+        FileSystem.TRASH_PREFIX;
+  }
+
+  /**
+   * Subtract a TrashCurrent to get a new path.
+   *
+   * @param path A path.
+   */
+  @VisibleForTesting
+  public static String subtractTrashCurrentPath(String path)
+      throws IOException {
+    return path.replaceAll("^" +
+        getTrashRoot() + TRASH_PATTERN, "");
+  }
+
+  /**
+   * If path is a path related to the trash can,
+   * subtract TrashCurrent to return a new path.
+   *
+   * @param path A path.
+   */
+  private static String processTrashPath(String path) throws IOException {
+    if (isTrashPath(path)) {
+      return subtractTrashCurrentPath(path);
+    } else {
+      return path;
+    }
+  }
+
   /**
    * Replaces the current in-memory cached of the mount table with a new
    * version fetched from the data store.
@@ -381,18 +433,26 @@ public class MountTableResolver
   public PathLocation getDestinationForPath(final String path)
       throws IOException {
     verifyMountTable();
+    PathLocation res;
     readLock.lock();
     try {
       if (this.locationCache == null) {
-        return lookupLocation(path);
+        res = lookupLocation(processTrashPath(path));
+      } else {
+        Callable<? extends PathLocation> meh = (Callable<PathLocation>) () ->
+            lookupLocation(processTrashPath(path));
+        res = this.locationCache.get(processTrashPath(path), meh);
       }
-      Callable<? extends PathLocation> meh = new Callable<PathLocation>() {
-        @Override
-        public PathLocation call() throws Exception {
-          return lookupLocation(path);
+      if (isTrashPath(path)) {
+        List<RemoteLocation> remoteLocations = new ArrayList<>();
+        for (RemoteLocation remoteLocation : res.getDestinations()) {
+          remoteLocations.add(new RemoteLocation(remoteLocation, path));
+        }
+        return new PathLocation(path, remoteLocations,
+            res.getDestinationOrder());
+      } else {
+        return res;
       }
-      };
-      return this.locationCache.get(path, meh);
     } catch (ExecutionException e) {
       Throwable cause = e.getCause();
       final IOException ioe;
@@ -450,8 +510,11 @@ public class MountTableResolver
   @Override
   public List<String> getMountPoints(final String str) throws IOException {
     verifyMountTable();
-    final String path = RouterAdmin.normalizeFileSystemPath(str);
 
+    String path = RouterAdmin.normalizeFileSystemPath(str);
+    if (isTrashPath(path)) {
+      path = subtractTrashCurrentPath(path);
+    }
     Set<String> children = new TreeSet<>();
     readLock.lock();
     try {

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/resolver/RemoteLocation.java

@@ -61,6 +61,20 @@ public class RemoteLocation extends RemoteLocationContext {
     this.srcPath = sPath;
   }
 
+  /**
+   * Use the Ns and Nn of a remote location
+   * and another path to create a new remote location pointing.
+   *
+   * @param remoteLocation A remoteLocation.
+   * @param path Path in the destination namespace.
+   */
+  public RemoteLocation(RemoteLocation remoteLocation, String path) {
+    this.nameserviceId = remoteLocation.nameserviceId;
+    this.namenodeId = remoteLocation.namenodeId;
+    this.dstPath = path;
+    this.srcPath = path;
+  }
+
   @Override
   public String getNameserviceId() {
     String ret = this.nameserviceId;

hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouterTrash.java

@@ -0,0 +1,297 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hdfs.server.federation.router;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.Trash;
+import org.apache.hadoop.fs.permission.FsPermission;
+import org.apache.hadoop.hdfs.DFSClient;
+import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.server.federation.MiniRouterDFSCluster;
+import org.apache.hadoop.hdfs.server.federation.RouterConfigBuilder;
+import org.apache.hadoop.hdfs.server.federation.StateStoreDFSCluster;
+import org.apache.hadoop.hdfs.server.federation.resolver.MountTableManager;
+import org.apache.hadoop.hdfs.server.federation.resolver.MountTableResolver;
+import org.apache.hadoop.hdfs.server.federation.store.protocol.*;
+import org.apache.hadoop.hdfs.server.federation.store.records.MountTable;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.util.Time;
+import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.net.URISyntaxException;
+import java.util.Collections;
+
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_TRASH_INTERVAL_KEY;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+/**
+ * This is a test through the Router move data to the Trash.
+ */
+public class TestRouterTrash {
+
+  public static final Logger LOG =
+      LoggerFactory.getLogger(TestRouterTrash.class);
+
+  private static StateStoreDFSCluster cluster;
+  private static MiniRouterDFSCluster.RouterContext routerContext;
+  private static MountTableResolver mountTable;
+  private static FileSystem routerFs;
+  private static FileSystem nnFs;
+  private static final String TEST_USER = "test-trash";
+  private static MiniRouterDFSCluster.NamenodeContext nnContext;
+  private static String ns0;
+  private static String ns1;
+  private static final String MOUNT_POINT = "/home/data";
+  private static final String FILE = MOUNT_POINT + "/file1";
+  private static final String TRASH_ROOT = "/user/" + TEST_USER + "/.Trash";
+  private static final String CURRENT = "/Current";
+
+  @BeforeClass
+  public static void globalSetUp() throws Exception {
+    // Build and start a federated cluster
+    cluster = new StateStoreDFSCluster(false, 2);
+    Configuration conf = new RouterConfigBuilder()
+        .stateStore()
+        .admin()
+        .rpc()
+        .http()
+        .build();
+    conf.set(FS_TRASH_INTERVAL_KEY, "100");
+    cluster.addRouterOverrides(conf);
+    cluster.startCluster();
+    cluster.startRouters();
+    cluster.waitClusterUp();
+
+    ns0 = cluster.getNameservices().get(0);
+    ns1 = cluster.getNameservices().get(1);
+
+    routerContext = cluster.getRandomRouter();
+    routerFs = routerContext.getFileSystem();
+    nnContext = cluster.getNamenode(ns0, null);
+    nnFs = nnContext.getFileSystem();
+    Router router = routerContext.getRouter();
+    mountTable = (MountTableResolver) router.getSubclusterResolver();
+  }
+
+  @AfterClass
+  public static void tearDown() {
+    if (cluster != null) {
+      cluster.stopRouter(routerContext);
+      cluster.shutdown();
+      cluster = null;
+    }
+  }
+
+  @After
+  public void clearMountTable() throws IOException {
+    RouterClient client = routerContext.getAdminClient();
+    MountTableManager mountTableManager = client.getMountTableManager();
+    GetMountTableEntriesRequest req1 =
+        GetMountTableEntriesRequest.newInstance("/");
+    GetMountTableEntriesResponse response =
+        mountTableManager.getMountTableEntries(req1);
+    for (MountTable entry : response.getEntries()) {
+      RemoveMountTableEntryRequest req2 =
+          RemoveMountTableEntryRequest.newInstance(entry.getSourcePath());
+      mountTableManager.removeMountTableEntry(req2);
+    }
+  }
+
+  @After
+  public void clearFile() throws IOException {
+    FileStatus[] fileStatuses = nnFs.listStatus(new Path("/"));
+    for (FileStatus file : fileStatuses) {
+      nnFs.delete(file.getPath(), true);
+    }
+  }
+
+  private boolean addMountTable(final MountTable entry) throws IOException {
+    RouterClient client = routerContext.getAdminClient();
+    MountTableManager mountTableManager = client.getMountTableManager();
+    AddMountTableEntryRequest addRequest =
+        AddMountTableEntryRequest.newInstance(entry);
+    AddMountTableEntryResponse addResponse =
+        mountTableManager.addMountTableEntry(addRequest);
+    // Reload the Router cache
+    mountTable.loadCache(true);
+    return addResponse.getStatus();
+  }
+
+  @Test
+  public void testMoveToTrashNoMountPoint() throws IOException,
+      URISyntaxException, InterruptedException {
+    MountTable addEntry = MountTable.newInstance(MOUNT_POINT,
+        Collections.singletonMap(ns0, MOUNT_POINT));
+    assertTrue(addMountTable(addEntry));
+    // current user client
+    DFSClient client = nnContext.getClient();
+    client.setOwner("/", TEST_USER, TEST_USER);
+    UserGroupInformation ugi = UserGroupInformation.
+        createRemoteUser(TEST_USER);
+    // test user client
+    client = nnContext.getClient(ugi);
+    client.mkdirs(MOUNT_POINT, new FsPermission("777"), true);
+    assertTrue(client.exists(MOUNT_POINT));
+    // create test file
+    client.create(FILE, true);
+    Path filePath = new Path(FILE);
+
+    FileStatus[] fileStatuses = routerFs.listStatus(filePath);
+    assertEquals(1, fileStatuses.length);
+    assertEquals(TEST_USER, fileStatuses[0].getOwner());
+    // move to Trash
+    Configuration routerConf = routerContext.getConf();
+    FileSystem fs =
+        DFSTestUtil.getFileSystemAs(ugi, routerConf);
+    Trash trash = new Trash(fs, routerConf);
+    assertTrue(trash.moveToTrash(filePath));
+    fileStatuses = nnFs.listStatus(
+        new Path(TRASH_ROOT + CURRENT + MOUNT_POINT));
+    assertEquals(1, fileStatuses.length);
+    assertTrue(nnFs.exists(new Path(TRASH_ROOT + CURRENT + FILE)));
+    assertTrue(nnFs.exists(new Path("/user/" +
+        TEST_USER + "/.Trash/Current" + FILE)));
+    // When the target path in Trash already exists.
+    client.create(FILE, true);
+    filePath = new Path(FILE);
+    fileStatuses = routerFs.listStatus(filePath);
+    assertEquals(1, fileStatuses.length);
+    assertTrue(trash.moveToTrash(filePath));
+    fileStatuses = routerFs.listStatus(
+        new Path(TRASH_ROOT + CURRENT + MOUNT_POINT));
+    assertEquals(2, fileStatuses.length);
+  }
+
+  @Test
+  public void testDeleteToTrashExistMountPoint() throws IOException,
+      URISyntaxException, InterruptedException {
+    MountTable addEntry = MountTable.newInstance(MOUNT_POINT,
+        Collections.singletonMap(ns0, MOUNT_POINT));
+    assertTrue(addMountTable(addEntry));
+    // add Trash mount point
+    addEntry = MountTable.newInstance(TRASH_ROOT,
+        Collections.singletonMap(ns1, TRASH_ROOT));
+    assertTrue(addMountTable(addEntry));
+    // current user client
+    DFSClient client = nnContext.getClient();
+    client.setOwner("/", TEST_USER, TEST_USER);
+    UserGroupInformation ugi = UserGroupInformation.
+        createRemoteUser(TEST_USER);
+    // test user client
+    client = nnContext.getClient(ugi);
+    client.mkdirs(MOUNT_POINT, new FsPermission("777"), true);
+    assertTrue(client.exists(MOUNT_POINT));
+    // create test file
+    client.create(FILE, true);
+    Path filePath = new Path(FILE);
+
+    FileStatus[] fileStatuses = routerFs.listStatus(filePath);
+    assertEquals(1, fileStatuses.length);
+    assertEquals(TEST_USER, fileStatuses[0].getOwner());
+
+    // move to Trash
+    Configuration routerConf = routerContext.getConf();
+    FileSystem fs =
+        DFSTestUtil.getFileSystemAs(ugi, routerConf);
+    Trash trash = new Trash(fs, routerConf);
+    assertTrue(trash.moveToTrash(filePath));
+    fileStatuses = nnFs.listStatus(
+        new Path(TRASH_ROOT + CURRENT + MOUNT_POINT));
+    assertEquals(1, fileStatuses.length);
+    assertTrue(nnFs.exists(new Path(TRASH_ROOT + CURRENT + FILE)));
+    // When the target path in Trash already exists.
+    client.create(FILE, true);
+    filePath = new Path(FILE);
+
+    fileStatuses = nnFs.listStatus(filePath);
+    assertEquals(1, fileStatuses.length);
+    assertTrue(trash.moveToTrash(filePath));
+    fileStatuses = nnFs.listStatus(
+        new Path(TRASH_ROOT + CURRENT + MOUNT_POINT));
+    assertEquals(2, fileStatuses.length);
+  }
+
+  @Test
+  public void testIsTrashPath() throws IOException {
+    UserGroupInformation ugi = UserGroupInformation.getCurrentUser();
+    assertNotNull(ugi);
+    assertTrue(MountTableResolver.isTrashPath(
+        "/user/" + ugi.getUserName() + "/.Trash/Current" + MOUNT_POINT));
+    assertTrue(MountTableResolver.isTrashPath(
+        "/user/" + ugi.getUserName() +
+            "/.Trash/" + Time.now() + MOUNT_POINT));
+    assertFalse(MountTableResolver.isTrashPath(MOUNT_POINT));
+
+    // Contains TrashCurrent but does not begin with TrashCurrent.
+    assertFalse(MountTableResolver.isTrashPath("/home/user/" +
+        ugi.getUserName() + "/.Trash/Current" + MOUNT_POINT));
+    assertFalse(MountTableResolver.isTrashPath("/home/user/" +
+        ugi.getUserName() + "/.Trash/" + Time.now() + MOUNT_POINT));
+
+    // Special cases.
+    assertFalse(MountTableResolver.isTrashPath(""));
+    assertFalse(MountTableResolver.isTrashPath(
+        "/home/user/empty.Trash/Current"));
+    assertFalse(MountTableResolver.isTrashPath(
+        "/home/user/.Trash"));
+    assertFalse(MountTableResolver.isTrashPath(
+        "/.Trash/Current"));
+  }
+
+  @Test
+  public void testSubtractTrashCurrentPath() throws IOException {
+    UserGroupInformation ugi = UserGroupInformation.getCurrentUser();
+    assertNotNull(ugi);
+    assertEquals(MOUNT_POINT, MountTableResolver.subtractTrashCurrentPath(
+        "/user/" + ugi.getUserName() + "/.Trash/Current" + MOUNT_POINT));
+    assertEquals(MOUNT_POINT, MountTableResolver.subtractTrashCurrentPath(
+        "/user/" + ugi.getUserName() +
+            "/.Trash/" + Time.now() + MOUNT_POINT));
+
+    // Contains TrashCurrent but does not begin with TrashCurrent.
+    assertEquals("/home/user/" + ugi.getUserName() +
+        "/.Trash/Current" + MOUNT_POINT, MountTableResolver.
+        subtractTrashCurrentPath("/home/user/" +
+            ugi.getUserName() + "/.Trash/Current" + MOUNT_POINT));
+    long time = Time.now();
+    assertEquals("/home/user/" + ugi.getUserName() +
+        "/.Trash/" + time + MOUNT_POINT, MountTableResolver.
+        subtractTrashCurrentPath("/home/user/" + ugi.getUserName() +
+            "/.Trash/" + time + MOUNT_POINT));
+    // Special cases.
+    assertEquals("", MountTableResolver.subtractTrashCurrentPath(""));
+    assertEquals("/home/user/empty.Trash/Current", MountTableResolver.
+        subtractTrashCurrentPath("/home/user/empty.Trash/Current"));
+    assertEquals("/home/user/.Trash", MountTableResolver.
+        subtractTrashCurrentPath("/home/user/.Trash"));
+    assertEquals("/.Trash/Current", MountTableResolver.
+        subtractTrashCurrentPath("/.Trash/Current"));
+  }
+}