Java tutorial
/** * 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"; }