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.jobtracker; import org.apache.hadoop.classification.InterfaceAudience; import org.apache.hadoop.classification.InterfaceStability; import org.apache.hadoop.mapreduce.MRConfig; /** * Place holder for JobTracker server-level configuration. * * The keys should have "mapreduce.jobtracker." as the prefix */ @InterfaceAudience.Private @InterfaceStability.Evolving public interface JTConfig extends MRConfig { // JobTracker configuration parameters public static final String JT_IPC_ADDRESS = "mapreduce.jobtracker.address"; public static final String JT_PERSIST_JOBSTATUS = "mapreduce.jobtracker.persist.jobstatus.active"; public static final String JT_RETIREJOBS = "mapreduce.jobtracker.retirejobs"; public static final String JT_TASKCACHE_LEVELS = "mapreduce.jobtracker.taskcache.levels"; public static final String JT_SYSTEM_DIR = "mapreduce.jobtracker.system.dir"; public static final String JT_STAGING_AREA_ROOT = "mapreduce.jobtracker.staging.root.dir"; public static final String JT_MAX_MAPMEMORY_MB = "mapreduce.jobtracker.maxmapmemory.mb"; public static final String JT_MAX_REDUCEMEMORY_MB = "mapreduce.jobtracker.maxreducememory.mb"; public static final String JT_USER_NAME = "mapreduce.jobtracker.kerberos.principal"; }