content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.cli.table.command;
  
  import alluxio.AlluxioURI;
  import alluxio.annotation.PublicApi;
  import alluxio.cli.CommandUtils;
  import alluxio.cli.fs.command.DistributedLoadUtils;
  import alluxio.client.file.FileSystemContext;
  import alluxio.client.table.TableMasterClient;
  import alluxio.conf.AlluxioConfiguration;
  import alluxio.exception.AlluxioException;
  import alluxio.exception.status.AlluxioStatusException;
  import alluxio.exception.status.InvalidArgumentException;
  import alluxio.table.common.CatalogPathUtils;
  
  import org.apache.commons.cli.CommandLine;
  import org.apache.commons.cli.Options;
  
  import java.io.IOException;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * Loads table into Alluxio space, makes it resident in memory.
   */
  @ThreadSafe
  @PublicApi
  public class LoadTableCommand extends AbstractTableCommand {
  
    /**
     *  Constructs a new instance to load table into Alluxio space.
     *
     * @param conf      the alluxio configuration
     * @param client    the client interface which can be used to make RPCs against the table master
     * @param fsContext the filesystem of Alluxio
     */
    public LoadTableCommand(AlluxioConfiguration conf, TableMasterClient client,
        FileSystemContext fsContext) {
      super(conf, client, fsContext);
    }
  
    @Override
    public String getUsage() {
      return "load  "
          + DistributedLoadUtils.getDistLoadCommonUsage()
          + "<db name> <table name>";
    }
  
    @Override
    public String getCommandName() {
      return "load";
    }
  
    @Override
    public String getDescription() {
      return "Loads table into Alluxio space. Currently only support hive table.";
    }
  
    @Override
    public Options getOptions() {
      return DistributedLoadUtils.getDistLoadCommonOptions();
    }
  
    @Override
    public void validateArgs(CommandLine cl) throws InvalidArgumentException {
      CommandUtils.checkNumOfArgsEquals(this, cl, 2);
    }
  
    @Override
    public int run(CommandLine cl) throws AlluxioException, IOException {
      System.out.println("***Tips：Load table command only support hive table for now.***");
      String[] args = cl.getArgs();
      String dbName = args[0];
      String tableName = args[1];
      if (!tableExists(dbName, tableName)) {
        System.out.printf("Failed to load table %s.%s: table is not exit.%n", dbName, tableName);
        return 0;
      }
      // Only support hive table for now.
      String udbType = "hive";
      // To load table into Alluxio space, we get the SDS table's Alluxio parent path first and
      // then load data under the path. For now, each table have one single parent path generated
      // by CatalogPathUtils#getTablePathUdb.
      // The parent path is mounted by SDS, it's mapping of the under table's UFS path in Alluxio.
      // e.g.
      //                                                   attached
      // [SDS]default.test                                 <===== [hive]default.test
      //                                                    mount
      // [SDS]alluxio:///catalog/default/tables/test/hive/ <===== [hive]hdfs:///.../default.db/test/
      // PLEASE NOTE: If Alluxio support different parent path, this statement can not guaranteed
      // to be correct.
      AlluxioURI path = CatalogPathUtils.getTablePathUdb(dbName, tableName, udbType);
      System.out.printf("Loading table %s.%s...%n", dbName, tableName);
      return DistributedLoadUtils.distributedLoad(this, cl, path.getPath());
    }
  
    private boolean tableExists(String dbName, String tableName) {
      try {
        // If getTable method called succeed, the table is exists.
        mClient.getTable(dbName, tableName);
        return true;
      } catch (AlluxioStatusException e) {
        return false;
      }
    }
  }
  