content: /*
   * Copyright (c) 2024, Alibaba Cloud;
   * Licensed 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
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * 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 com.aliyun.dataworks.migrationx.transformer.core.sqoop;
  
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.mapreduce.Job;
  import org.apache.hadoop.mapreduce.JobContext;
  import org.apache.hadoop.util.GenericOptionsParser;
  import org.apache.hadoop.util.ReflectionUtils;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * This class provides static helper methods that allow access and manipulation of job configuration. It is convenient
   * to keep such access in one place in order to allow easy modifications when some of these aspects change from version
   * to version of Hadoop.
   */
  public final class ConfigurationHelper {
  
      /**
       * We track the number of maps in local mode separately as mapred.map.tasks or mapreduce.job.maps is ignored in
       * local mode and will always return 1 irrespective of what we set the value to in the configuration.
       */
      public static int numLocalModeMaps = 1;
  
      /**
       * Set the (hinted) number of map tasks for a job.
       */
      public static void setJobNumMaps(Job job, int numMapTasks) {
          if (isLocalJobTracker(job.getConfiguration())) {
              numLocalModeMaps = numMapTasks;
          } else {
              job.getConfiguration().setInt(
                  ConfigurationConstants.PROP_MAPRED_MAP_TASKS, numMapTasks);
          }
      }
  
      /**
       * Get the (hinted) number of map tasks for a job.
       */
      public static int getJobNumMaps(JobContext job) {
          if (isLocalJobTracker(job.getConfiguration())) {
              return numLocalModeMaps;
          } else {
              return job.getConfiguration().getInt(
                  ConfigurationConstants.PROP_MAPRED_MAP_TASKS, 1);
          }
      }
  
      /**
       * @return the number of mapper output records from a job using its counters.
       */
      public static long getNumMapOutputRecords(Job job)
          throws IOException, InterruptedException {
          return job.getCounters().findCounter(
              ConfigurationConstants.COUNTER_GROUP_MAPRED_TASK_COUNTERS,
              ConfigurationConstants.COUNTER_MAP_OUTPUT_RECORDS).getValue();
      }
  
      /**
       * @return the number of mapper input records from a job using its counters.
       */
      public static long getNumMapInputRecords(Job job)
          throws IOException, InterruptedException {
          return job.getCounters().findCounter(
              ConfigurationConstants.COUNTER_GROUP_MAPRED_TASK_COUNTERS,
              ConfigurationConstants.COUNTER_MAP_INPUT_RECORDS).getValue();
      }
  
      /**
       * Get the (hinted) number of map tasks for a job.
       */
      public static int getConfNumMaps(Configuration conf) {
          if (isLocalJobTracker(conf)) {
              return numLocalModeMaps;
          } else {
              return conf.getInt(ConfigurationConstants.PROP_MAPRED_MAP_TASKS, 1);
          }
      }
  
      /**
       * Set the mapper speculative execution property for a job.
       */
      public static void setJobMapSpeculativeExecution(Job job, boolean isEnabled) {
          job.getConfiguration().setBoolean(
              ConfigurationConstants.PROP_MAPRED_MAP_TASKS_SPECULATIVE_EXEC,
              isEnabled);
      }
  
      /**
       * Set the reducer speculative execution property for a job.
       */
      public static void setJobReduceSpeculativeExecution(
          Job job, boolean isEnabled) {
          job.getConfiguration().setBoolean(
              ConfigurationConstants.PROP_MAPRED_REDUCE_TASKS_SPECULATIVE_EXEC,
              isEnabled);
      }
  
      /**
       * Sets the Jobtracker address to use for a job.
       */
      public static void setJobtrackerAddr(Configuration conf, String addr) {
          conf.set(ConfigurationConstants.PROP_MAPRED_JOB_TRACKER_ADDRESS, addr);
      }
  
      /**
       * @return the Configuration property identifying a DBWritable to use.
       */
      public static String getDbInputClassProperty() {
          return DBConfiguration.INPUT_CLASS_PROPERTY;
      }
  
      /**
       * @return the Configuration property identifying the DB username.
       */
      public static String getDbUsernameProperty() {
          return DBConfiguration.USERNAME_PROPERTY;
      }
  
      /**
       * @return the Configuration property identifying the DB password.
       */
      public static String getDbPasswordProperty() {
          return DBConfiguration.PASSWORD_PROPERTY;
      }
  
      /**
       * @return the Configuration property identifying the DB connect string.
       */
      public static String getDbUrlProperty() {
          return DBConfiguration.URL_PROPERTY;
      }
  
      /**
       * @return the Configuration property identifying the DB input table.
       */
      public static String getDbInputTableNameProperty() {
          return DBConfiguration.INPUT_TABLE_NAME_PROPERTY;
      }
  
      /**
       * @return the Configuration property specifying WHERE conditions for the db table.
       */
      public static String getDbInputConditionsProperty() {
          return DBConfiguration.INPUT_CONDITIONS_PROPERTY;
      }
  
      /**
       * Parse arguments in 'args' via the GenericOptionsParser and embed the results in the supplied configuration.
       *
       * @param conf the configuration to populate with generic options.
       * @param args the arguments to process.
       * @return the unused args to be passed to the application itself.
       */
      public static String[] parseGenericOptions(
          Configuration conf, String[] args) throws IOException {
          // This needs to be shimmed because in Apache Hadoop this can throw
          // an IOException, but it does not do so in CDH. We just mandate in
          // this method that an IOException is possible.
          GenericOptionsParser genericParser = new GenericOptionsParser(
              conf, args);
          return genericParser.getRemainingArgs();
      }
  
      /**
       * Get the value of the <code>name</code> property as a <code>List</code> of objects implementing the interface
       * specified by <code>xface</code>.
       * <p>
       * An exception is thrown if any of the classes does not exist, or if it does not implement the named interface.
       *
       * @param name  the property name.
       * @param xface the interface implemented by the classes named by
       *              <code>name</code>.
       * @return a <code>List</code> of objects implementing <code>xface</code>.
       */
      @SuppressWarnings("unchecked")
      public static <U> List<U> getInstances(Configuration conf,
                                             String name, Class<U> xface) {
          List<U> ret = new ArrayList<U>();
          Class<?>[] classes = conf.getClasses(name);
          for (Class<?> cl : classes) {
              if (!xface.isAssignableFrom(cl)) {
                  throw new RuntimeException(cl + " does not implement " + xface);
              }
              ret.add((U)ReflectionUtils.newInstance(cl, conf));
          }
          return ret;
      }
  
      /**
       * Stores in configuration the size of single hadoop input split.
       *
       * @param config     Configuration to store the split size.
       * @param splitLimit The size of single hadoop input split.
       */
      public static void setSplitLimit(Configuration config, long splitLimit) {
          config.setLong(ConfigurationConstants.PROP_SPLIT_LIMIT, splitLimit);
      }
  
      /**
       * Retrieves the size of single hadoop input split.
       *
       * @param config Configuration to retrieve the split size.
       * @return Split size.
       */
      public static long getSplitLimit(Configuration config) {
          return config.getInt(ConfigurationConstants.PROP_SPLIT_LIMIT, -1);
      }
  
      public static boolean isLocalJobTracker(Configuration conf) {
          // If framework is set to YARN, then we can't be running in local mode
          if ("yarn".equalsIgnoreCase(conf
              .get(ConfigurationConstants.PROP_MAPREDUCE_FRAMEWORK_NAME))) {
              return false;
          }
          String jtAddr = conf
              .get(ConfigurationConstants.PROP_MAPRED_JOB_TRACKER_ADDRESS);
          String jtAddr2 = conf
              .get(ConfigurationConstants.PROP_MAPREDUCE_JOB_TRACKER_ADDRESS);
          return (jtAddr != null && jtAddr.equals("local"))
              || (jtAddr2 != null && jtAddr2.equals("local"));
      }
  
      private ConfigurationHelper() {
          // Disable explicit object creation
      }
  }