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; import org.apache.hadoop.classification.InterfaceAudience; import org.apache.hadoop.classification.InterfaceAudience.Public; import org.apache.hadoop.classification.InterfaceStability.Unstable; /** * Place holder for cluster level configuration keys. * * The keys should have "mapreduce.cluster." as the prefix. * */ @InterfaceAudience.Private public interface MRConfig { // Cluster-level configuration parameters public static final String TEMP_DIR = "mapreduce.cluster.temp.dir"; public static final String LOCAL_DIR = "mapreduce.cluster.local.dir"; public static final String MAPMEMORY_MB = "mapreduce.cluster.mapmemory.mb"; public static final String REDUCEMEMORY_MB = "mapreduce.cluster.reducememory.mb"; public static final String MR_ACLS_ENABLED = "mapreduce.cluster.acls.enabled"; public static final String MR_ADMINS = "mapreduce.cluster.administrators"; @Deprecated public static final String MR_SUPERGROUP = "mapreduce.cluster.permissions.supergroup"; //Delegation token related keys public static final String DELEGATION_KEY_UPDATE_INTERVAL_KEY = "mapreduce.cluster.delegation.key.update-interval"; public static final long DELEGATION_KEY_UPDATE_INTERVAL_DEFAULT = 24 * 60 * 60 * 1000; // 1 day public static final String DELEGATION_TOKEN_RENEW_INTERVAL_KEY = "mapreduce.cluster.delegation.token.renew-interval"; public static final long DELEGATION_TOKEN_RENEW_INTERVAL_DEFAULT = 24 * 60 * 60 * 1000; // 1 day public static final String DELEGATION_TOKEN_MAX_LIFETIME_KEY = "mapreduce.cluster.delegation.token.max-lifetime"; public static final long DELEGATION_TOKEN_MAX_LIFETIME_DEFAULT = 7 * 24 * 60 * 60 * 1000; // 7 days public static final String RESOURCE_CALCULATOR_PROCESS_TREE = "mapreduce.job.process-tree.class"; public static final String STATIC_RESOLUTIONS = "mapreduce.job.net.static.resolutions"; public static final String MASTER_ADDRESS = "mapreduce.jobtracker.address"; public static final String MASTER_USER_NAME = "mapreduce.jobtracker.kerberos.principal"; public static final String FRAMEWORK_NAME = "mapreduce.framework.name"; public static final String CLASSIC_FRAMEWORK_NAME = "classic"; public static final String YARN_FRAMEWORK_NAME = "yarn"; public static final String LOCAL_FRAMEWORK_NAME = "local"; public static final String TASK_LOCAL_OUTPUT_CLASS = "mapreduce.task.local.output.class"; public static final String PROGRESS_STATUS_LEN_LIMIT_KEY = "mapreduce.task.max.status.length"; public static final int PROGRESS_STATUS_LEN_LIMIT_DEFAULT = 512; public static final int MAX_BLOCK_LOCATIONS_DEFAULT = 15; public static final String MAX_BLOCK_LOCATIONS_KEY = "mapreduce.job.max.split.locations"; public static final String SHUFFLE_SSL_ENABLED_KEY = "mapreduce.shuffle.ssl.enabled"; public static final boolean SHUFFLE_SSL_ENABLED_DEFAULT = false; public static final String SHUFFLE_CONSUMER_PLUGIN = "mapreduce.job.reduce.shuffle.consumer.plugin.class"; /** * Configuration key to enable/disable IFile readahead. */ public static final String MAPRED_IFILE_READAHEAD = "mapreduce.ifile.readahead"; public static final boolean DEFAULT_MAPRED_IFILE_READAHEAD = true; /** * Configuration key to set the IFile readahead length in bytes. */ public static final String MAPRED_IFILE_READAHEAD_BYTES = "mapreduce.ifile.readahead.bytes"; public static final int DEFAULT_MAPRED_IFILE_READAHEAD_BYTES = 4 * 1024 * 1024; /** * Whether users are explicitly trying to control resource monitoring * configuration for the MiniMRCluster. Disabled by default. */ public static final String MAPREDUCE_MINICLUSTER_CONTROL_RESOURCE_MONITORING = "mapreduce.minicluster.control-resource-monitoring"; public static final boolean DEFAULT_MAPREDUCE_MINICLUSTER_CONTROL_RESOURCE_MONITORING = false; @Public @Unstable public static final String MAPREDUCE_APP_SUBMISSION_CROSS_PLATFORM = "mapreduce.app-submission.cross-platform"; @Public @Unstable public static final boolean DEFAULT_MAPREDUCE_APP_SUBMISSION_CROSS_PLATFORM = false; /** * Enable application master webapp ui actions. */ String MASTER_WEBAPP_UI_ACTIONS_ENABLED = "mapreduce.webapp.ui-actions.enabled"; boolean DEFAULT_MASTER_WEBAPP_UI_ACTIONS_ENABLED = true; }