/**
 * 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
 *
 *     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 org.apache.hadoop.examples.terasort;

import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceStability.Unstable;

/**
 * <p>
 * TeraSort configurations.
 * </p>
 */
@Private
@Unstable
public enum TeraSortConfigKeys {

  NUM_ROWS("mapreduce.terasort.num-rows",
      "Number of rows to generate during teragen."),

  NUM_PARTITIONS("mapreduce.terasort.num.partitions",
      "Number of partitions used for sampling."),

  SAMPLE_SIZE("mapreduce.terasort.partitions.sample",
      "Sample size for each partition."),

  FINAL_SYNC_ATTRIBUTE("mapreduce.terasort.final.sync",
      "Perform a disk-persisting hsync at end of every file-write."),

  USE_TERA_SCHEDULER("mapreduce.terasort.use.terascheduler",
      "Use TeraScheduler for computing input split distribution."),

  USE_SIMPLE_PARTITIONER("mapreduce.terasort.simplepartitioner",
      "Use SimplePartitioner instead of TotalOrderPartitioner."),

  OUTPUT_REPLICATION("mapreduce.terasort.output.replication",
      "Replication factor to use for output data files.");

  private String confName;
  private String description;

  TeraSortConfigKeys(String configName, String description) {
    this.confName = configName;
    this.description = description;
  }

  public String key() {
    return this.confName;
  }

  public String toString() {
    return "<" + confName + ">     " + description;
  }

  public static final long DEFAULT_NUM_ROWS = 0L;
  public static final int DEFAULT_NUM_PARTITIONS = 10;
  public static final long DEFAULT_SAMPLE_SIZE = 100000L;
  public static final boolean DEFAULT_FINAL_SYNC_ATTRIBUTE = true;
  public static final boolean DEFAULT_USE_TERA_SCHEDULER = true;
  public static final boolean DEFAULT_USE_SIMPLE_PARTITIONER = false;
  public static final int DEFAULT_OUTPUT_REPLICATION = 1;
}