HBASE-27541 Backups should be able to be restored to a separate filesystem (#4933)

Signed-off-by: Bryan Beaudreault <bbeaudreault@apache.org>

hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/RestoreJob.java

@@ -34,10 +34,11 @@ public interface RestoreJob extends Configurable {
    * Run restore operation
    * @param dirPaths          path array of WAL log directories
    * @param fromTables        from tables
+   * @param restoreRootDir    output file system
    * @param toTables          to tables
    * @param fullBackupRestore full backup restore
    * @throws IOException if running the job fails
    */
-  void run(Path[] dirPaths, TableName[] fromTables, TableName[] toTables, boolean fullBackupRestore)
+  void run(Path[] dirPaths, TableName[] fromTables, Path restoreRootDir, TableName[] toTables,
-    throws IOException;
+    boolean fullBackupRestore) throws IOException;
 }

hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/RestoreRequest.java

@@ -37,6 +37,11 @@ public final class RestoreRequest {
       return this;
     }
 
+    public Builder withRestoreRootDir(String restoreRootDir) {
+      request.setRestoreRootDir(restoreRootDir);
+      return this;
+    }
+
     public Builder withBackupId(String backupId) {
       request.setBackupId(backupId);
       return this;
@@ -68,6 +73,7 @@ public final class RestoreRequest {
   }
 
   private String backupRootDir;
+  private String restoreRootDir;
   private String backupId;
   private boolean check = false;
   private TableName[] fromTables;
@@ -86,6 +92,15 @@ public final class RestoreRequest {
     return this;
   }
 
+  public String getRestoreRootDir() {
+    return restoreRootDir;
+  }
+
+  private RestoreRequest setRestoreRootDir(String restoreRootDir) {
+    this.restoreRootDir = restoreRootDir;
+    return this;
+  }
+
   public String getBackupId() {
     return backupId;
   }

hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/impl/RestoreTablesClient.java

@@ -35,6 +35,7 @@ import org.apache.hadoop.hbase.backup.BackupType;
 import org.apache.hadoop.hbase.backup.HBackupFileSystem;
 import org.apache.hadoop.hbase.backup.RestoreRequest;
 import org.apache.hadoop.hbase.backup.impl.BackupManifest.BackupImage;
+import org.apache.hadoop.hbase.backup.util.BackupUtils;
 import org.apache.hadoop.hbase.backup.util.RestoreTool;
 import org.apache.hadoop.hbase.client.Admin;
 import org.apache.hadoop.hbase.client.Connection;
@@ -55,11 +56,12 @@ public class RestoreTablesClient {
   private String backupId;
   private TableName[] sTableArray;
   private TableName[] tTableArray;
-  private String targetRootDir;
+  private String backupRootDir;
+  private Path restoreRootDir;
   private boolean isOverwrite;
 
-  public RestoreTablesClient(Connection conn, RestoreRequest request) {
+  public RestoreTablesClient(Connection conn, RestoreRequest request) throws IOException {
-    this.targetRootDir = request.getBackupRootDir();
+    this.backupRootDir = request.getBackupRootDir();
     this.backupId = request.getBackupId();
     this.sTableArray = request.getFromTables();
     this.tTableArray = request.getToTables();
@@ -69,6 +71,12 @@ public class RestoreTablesClient {
     this.isOverwrite = request.isOverwrite();
     this.conn = conn;
     this.conf = conn.getConfiguration();
+    if (request.getRestoreRootDir() != null) {
+      restoreRootDir = new Path(request.getRestoreRootDir());
+    } else {
+      FileSystem fs = FileSystem.get(conf);
+      this.restoreRootDir = BackupUtils.getTmpRestoreOutputDir(fs, conf);
+    }
   }
 
   /**
@@ -131,7 +139,7 @@ public class RestoreTablesClient {
     String rootDir = image.getRootDir();
     String backupId = image.getBackupId();
     Path backupRoot = new Path(rootDir);
-    RestoreTool restoreTool = new RestoreTool(conf, backupRoot, backupId);
+    RestoreTool restoreTool = new RestoreTool(conf, backupRoot, restoreRootDir, backupId);
     Path tableBackupPath = HBackupFileSystem.getTableBackupPath(sTable, backupRoot, backupId);
     String lastIncrBackupId = images.length == 1 ? null : images[images.length - 1].getBackupId();
     // We need hFS only for full restore (see the code)
@@ -249,7 +257,7 @@ public class RestoreTablesClient {
     // case RESTORE_IMAGES:
     HashMap<TableName, BackupManifest> backupManifestMap = new HashMap<>();
     // check and load backup image manifest for the tables
-    Path rootPath = new Path(targetRootDir);
+    Path rootPath = new Path(backupRootDir);
     HBackupFileSystem.checkImageManifestExist(backupManifestMap, sTableArray, conf, rootPath,
       backupId);
 

hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/mapreduce/MapReduceRestoreJob.java

@@ -50,8 +50,8 @@ public class MapReduceRestoreJob implements RestoreJob {
   }
 
   @Override
-  public void run(Path[] dirPaths, TableName[] tableNames, TableName[] newTableNames,
+  public void run(Path[] dirPaths, TableName[] tableNames, Path restoreRootDir,
-    boolean fullBackupRestore) throws IOException {
+    TableName[] newTableNames, boolean fullBackupRestore) throws IOException {
     String bulkOutputConfKey;
 
     player = new MapReduceHFileSplitterJob();
@@ -70,9 +70,8 @@ public class MapReduceRestoreJob implements RestoreJob {
 
     for (int i = 0; i < tableNames.length; i++) {
       LOG.info("Restore " + tableNames[i] + " into " + newTableNames[i]);
-
+      Path bulkOutputPath = BackupUtils.getBulkOutputDir(restoreRootDir,
-      Path bulkOutputPath = BackupUtils
+        BackupUtils.getFileNameCompatibleString(newTableNames[i]), getConf());
-        .getBulkOutputDir(BackupUtils.getFileNameCompatibleString(newTableNames[i]), getConf());
       Configuration conf = getConf();
       conf.set(bulkOutputConfKey, bulkOutputPath.toString());
       String[] playerArgs = { dirs,

hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/util/BackupUtils.java

@@ -690,21 +690,38 @@ public final class BackupUtils {
     return isValid;
   }
 
-  public static Path getBulkOutputDir(String tableName, Configuration conf, boolean deleteOnExit)
+  public static Path getBulkOutputDir(Path restoreRootDir, String tableName, Configuration conf,
-    throws IOException {
+    boolean deleteOnExit) throws IOException {
-    FileSystem fs = FileSystem.get(conf);
+    FileSystem fs = restoreRootDir.getFileSystem(conf);
-    String tmp =
+    Path path = new Path(restoreRootDir,
-      conf.get(HConstants.TEMPORARY_FS_DIRECTORY_KEY, fs.getHomeDirectory() + "/hbase-staging");
+      "bulk_output-" + tableName + "-" + EnvironmentEdgeManager.currentTime());
-    Path path = new Path(tmp + Path.SEPARATOR + "bulk_output-" + tableName + "-"
-      + EnvironmentEdgeManager.currentTime());
     if (deleteOnExit) {
       fs.deleteOnExit(path);
     }
     return path;
   }
 
-  public static Path getBulkOutputDir(String tableName, Configuration conf) throws IOException {
+  public static Path getBulkOutputDir(Path restoreRootDir, String tableName, Configuration conf)
-    return getBulkOutputDir(tableName, conf, true);
+    throws IOException {
+    return getBulkOutputDir(restoreRootDir, tableName, conf, true);
+  }
+
+  public static Path getBulkOutputDir(String tableName, Configuration conf, boolean deleteOnExit)
+    throws IOException {
+    FileSystem fs = FileSystem.get(conf);
+    return getBulkOutputDir(getTmpRestoreOutputDir(fs, conf), tableName, conf, deleteOnExit);
+  }
+
+  /**
+   * Build temporary output path
+   * @param fs   filesystem for default output dir
+   * @param conf configuration
+   * @return output path
+   */
+  public static Path getTmpRestoreOutputDir(FileSystem fs, Configuration conf) {
+    String tmp =
+      conf.get(HConstants.TEMPORARY_FS_DIRECTORY_KEY, fs.getHomeDirectory() + "/hbase-staging");
+    return new Path(tmp);
   }
 
   public static String getFileNameCompatibleString(TableName table) {

hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/util/RestoreTool.java

@@ -67,18 +67,20 @@ public class RestoreTool {
   private final String[] ignoreDirs = { HConstants.RECOVERED_EDITS_DIR };
   protected Configuration conf;
   protected Path backupRootPath;
+  protected Path restoreRootDir;
   protected String backupId;
   protected FileSystem fs;
 
   // store table name and snapshot dir mapping
   private final HashMap<TableName, Path> snapshotMap = new HashMap<>();
 
-  public RestoreTool(Configuration conf, final Path backupRootPath, final String backupId)
+  public RestoreTool(Configuration conf, final Path backupRootPath, final Path restoreRootDir,
-    throws IOException {
+    final String backupId) throws IOException {
     this.conf = conf;
     this.backupRootPath = backupRootPath;
     this.backupId = backupId;
     this.fs = backupRootPath.getFileSystem(conf);
+    this.restoreRootDir = restoreRootDir;
   }
 
   /**
@@ -200,7 +202,7 @@ public class RestoreTool {
       }
       RestoreJob restoreService = BackupRestoreFactory.getRestoreJob(conf);
 
-      restoreService.run(logDirs, tableNames, newTableNames, false);
+      restoreService.run(logDirs, tableNames, restoreRootDir, newTableNames, false);
     }
   }
 
@@ -350,8 +352,8 @@ public class RestoreTool {
       RestoreJob restoreService = BackupRestoreFactory.getRestoreJob(conf);
       Path[] paths = new Path[regionPathList.size()];
       regionPathList.toArray(paths);
-      restoreService.run(paths, new TableName[] { tableName }, new TableName[] { newTableName },
+      restoreService.run(paths, new TableName[] { tableName }, restoreRootDir,
-        true);
+        new TableName[] { newTableName }, true);
 
     } catch (Exception e) {
       LOG.error(e.toString(), e);

hbase-backup/src/test/java/org/apache/hadoop/hbase/backup/TestRemoteRestore.java

@@ -17,13 +17,21 @@
  */
 package org.apache.hadoop.hbase.backup;
 
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.HBaseTestingUtil;
+import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.backup.impl.BackupAdminImpl;
+import org.apache.hadoop.hbase.backup.mapreduce.MapReduceHFileSplitterJob;
 import org.apache.hadoop.hbase.backup.util.BackupUtils;
 import org.apache.hadoop.hbase.client.Admin;
+import org.apache.hadoop.hbase.client.ConnectionFactory;
 import org.apache.hadoop.hbase.testclassification.LargeTests;
 import org.junit.BeforeClass;
 import org.junit.ClassRule;
@@ -72,4 +80,51 @@ public class TestRemoteRestore extends TestBackupBase {
     TEST_UTIL.deleteTable(table1_restore);
     hba.close();
   }
+
+  /**
+   * Verify that restore jobs can be run on a standalone mapreduce cluster. Ensures hfiles output
+   * via {@link MapReduceHFileSplitterJob} exist on correct filesystem.
+   * @throws Exception if doing the backup or an operation on the tables fails
+   */
+  @Test
+  public void testFullRestoreRemoteWithAlternateRestoreOutputDir() throws Exception {
+    LOG.info("test remote full backup on a single table with alternate restore output dir");
+    String backupId =
+      backupTables(BackupType.FULL, toList(table1.getNameAsString()), BACKUP_REMOTE_ROOT_DIR);
+    LOG.info("backup complete");
+    TableName[] tableset = new TableName[] { table1 };
+    TableName[] tablemap = new TableName[] { table1_restore };
+
+    HBaseTestingUtil mrTestUtil = new HBaseTestingUtil();
+    mrTestUtil.setZkCluster(TEST_UTIL.getZkCluster());
+    mrTestUtil.startMiniDFSCluster(3);
+    mrTestUtil.startMiniMapReduceCluster();
+
+    Configuration testUtilConf = TEST_UTIL.getConnection().getConfiguration();
+    Configuration conf = new Configuration(mrTestUtil.getConfiguration());
+    conf.set(HConstants.ZOOKEEPER_ZNODE_PARENT,
+      testUtilConf.get(HConstants.ZOOKEEPER_ZNODE_PARENT));
+    conf.set(HConstants.MASTER_ADDRS_KEY, testUtilConf.get(HConstants.MASTER_ADDRS_KEY));
+
+    new BackupAdminImpl(ConnectionFactory.createConnection(conf))
+      .restore(new RestoreRequest.Builder().withBackupRootDir(BACKUP_REMOTE_ROOT_DIR)
+        .withRestoreRootDir(BACKUP_ROOT_DIR).withBackupId(backupId).withCheck(false)
+        .withFromTables(tableset).withToTables(tablemap).withOvewrite(false).build());
+
+    Path hfileOutputPath = new Path(
+      new Path(conf.get(MapReduceHFileSplitterJob.BULK_OUTPUT_CONF_KEY)).toUri().getPath());
+
+    // files exist on hbase cluster
+    FileSystem fileSystem = FileSystem.get(TEST_UTIL.getConfiguration());
+    assertTrue(fileSystem.exists(hfileOutputPath));
+
+    // files don't exist on MR cluster
+    fileSystem = FileSystem.get(conf);
+    assertFalse(fileSystem.exists(hfileOutputPath));
+
+    Admin hba = TEST_UTIL.getAdmin();
+    assertTrue(hba.tableExists(table1_restore));
+    TEST_UTIL.deleteTable(table1_restore);
+    hba.close();
+  }
 }