| /** |
| * 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.mapred; |
| |
| /******************************* |
| * Some handy constants |
| * |
| *******************************/ |
| interface MRConstants { |
| // |
| // Timeouts, constants |
| // |
| public static final int HEARTBEAT_INTERVAL_MIN = 5 * 1000; |
| |
| public static final int CLUSTER_INCREMENT = 50; |
| |
| public static final long COUNTER_UPDATE_INTERVAL = 60 * 1000; |
| |
| //for the inmemory filesystem (to do in-memory merge) |
| /** |
| * Constant denoting when a merge of in memory files will be triggered |
| */ |
| public static final float MAX_INMEM_FILESYS_USE = 0.66f; |
| |
| /** |
| * Constant denoting the max size (in terms of the fraction of the total |
| * size of the filesys) of a map output file that we will try |
| * to keep in mem. Ideally, this should be a factor of MAX_INMEM_FILESYS_USE |
| */ |
| public static final float MAX_INMEM_FILESIZE_FRACTION = |
| MAX_INMEM_FILESYS_USE/2; |
| |
| // |
| // Result codes |
| // |
| public static int SUCCESS = 0; |
| public static int FILE_NOT_FOUND = -1; |
| |
| /** |
| * The custom http header used for the map output length. |
| */ |
| public static final String MAP_OUTPUT_LENGTH = "Map-Output-Length"; |
| |
| /** |
| * The custom http header used for the "raw" map output length. |
| */ |
| public static final String RAW_MAP_OUTPUT_LENGTH = "Raw-Map-Output-Length"; |
| |
| /** |
| * Temporary directory name |
| */ |
| public static final String TEMP_DIR_NAME = "_temporary"; |
| |
| public static final String WORKDIR = "work"; |
| } |