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/**
 * 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.mapreduce.server.tasktracker;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.mapreduce.MRConfig;

/**
 * Place holder for TaskTracker server-level configuration.
 * 
 * The keys should have "mapreduce.tasktracker." as the prefix
 */
@InterfaceAudience.Private
@InterfaceStability.Evolving
public interface TTConfig extends MRConfig {

  // Task-tracker configuration properties
  public static final String TT_HEALTH_CHECKER_INTERVAL = 
    "mapreduce.tasktracker.healthchecker.interval";
  public static final String TT_HEALTH_CHECKER_SCRIPT_ARGS =
    "mapreduce.tasktracker.healthchecker.script.args";
  public static final String TT_HEALTH_CHECKER_SCRIPT_PATH =
    "mapreduce.tasktracker.healthchecker.script.path";
  public static final String TT_HEALTH_CHECKER_SCRIPT_TIMEOUT =
    "mapreduce.tasktracker.healthchecker.script.timeout";
  public static final String TT_LOCAL_DIR_MINSPACE_KILL = 
    "mapreduce.tasktracker.local.dir.minspacekill";
  public static final String TT_LOCAL_DIR_MINSPACE_START = 
    "mapreduce.tasktracker.local.dir.minspacestart";
  public static final String TT_HTTP_ADDRESS = 
    "mapreduce.tasktracker.http.address";
  public static final String TT_REPORT_ADDRESS = 
    "mapreduce.tasktracker.report.address";
  public static final String TT_TASK_CONTROLLER = 
    "mapreduce.tasktracker.taskcontroller";
  public static final String TT_CONTENTION_TRACKING = 
    "mapreduce.tasktracker.contention.tracking";
  public static final String TT_STATIC_RESOLUTIONS = 
    "mapreduce.tasktracker.net.static.resolutions";
  public static final String TT_HTTP_THREADS = 
    "mapreduce.tasktracker.http.threads";
  public static final String TT_HOST_NAME = "mapreduce.tasktracker.host.name";
  public static final String TT_SLEEP_TIME_BEFORE_SIG_KILL =
    "mapreduce.tasktracker.tasks.sleeptimebeforesigkill";
  public static final String TT_DNS_INTERFACE = 
    "mapreduce.tasktracker.dns.interface";
  public static final String TT_DNS_NAMESERVER = 
    "mapreduce.tasktracker.dns.nameserver";
  public static final String TT_MAX_TASK_COMPLETION_EVENTS_TO_POLL  = 
    "mapreduce.tasktracker.events.batchsize";
  public static final String TT_INDEX_CACHE = 
    "mapreduce.tasktracker.indexcache.mb";
  public static final String TT_INSTRUMENTATION = 
    "mapreduce.tasktracker.instrumentation";
  public static final String TT_MAP_SLOTS = 
    "mapreduce.tasktracker.map.tasks.maximum";
  /**
   * @deprecated Use {@link #TT_RESOURCE_CALCULATOR_PLUGIN} instead
   */
  @Deprecated
  public static final String TT_MEMORY_CALCULATOR_PLUGIN = 
    "mapreduce.tasktracker.memorycalculatorplugin";
  public static final String TT_RESOURCE_CALCULATOR_PLUGIN = 
    "mapreduce.tasktracker.resourcecalculatorplugin";
  public static final String TT_REDUCE_SLOTS = 
    "mapreduce.tasktracker.reduce.tasks.maximum";
  public static final String TT_LOCAL_CACHE_SIZE = 
    "mapreduce.tasktracker.cache.local.size";
  public static final String TT_LOCAL_CACHE_SUBDIRS_LIMIT =
    "mapreduce.tasktracker.cache.local.numberdirectories";
  public static final String TT_OUTOFBAND_HEARBEAT =
    "mapreduce.tasktracker.outofband.heartbeat";
  public static final String TT_RESERVED_PHYSCIALMEMORY_MB =
    "mapreduce.tasktracker.reserved.physicalmemory.mb";
  public static final String TT_USER_NAME = "mapreduce.tasktracker.kerberos.principal";
  public static final String TT_KEYTAB_FILE = 
    "mapreduce.tasktracker.keytab.file";
  public static final String TT_GROUP = 
    "mapreduce.tasktracker.group";
  public static final String TT_USERLOGCLEANUP_SLEEPTIME = 
    "mapreduce.tasktracker.userlogcleanup.sleeptime";
  public static final String TT_DISTRIBUTED_CACHE_CHECK_PERIOD =
    "mapreduce.tasktracker.distributedcache.checkperiod";
  /**
   * Percentage of the local distributed cache that should be kept in between
   * garbage collection.
   */
  public static final String TT_LOCAL_CACHE_KEEP_AROUND_PCT =
    "mapreduce.tasktracker.cache.local.keep.pct";

}