FSConstants.java
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上传日期:2018-01-08
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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.hdfs.protocol;
- import org.apache.hadoop.conf.Configuration;
- /************************************
- * Some handy constants
- *
- ************************************/
- public interface FSConstants {
- public static int MIN_BLOCKS_FOR_WRITE = 5;
- // Chunk the block Invalidate message
- public static final int BLOCK_INVALIDATE_CHUNK = 100;
- // Long that indicates "leave current quota unchanged"
- public static final long QUOTA_DONT_SET = Long.MAX_VALUE;
- public static final long QUOTA_RESET = -1L;
-
- //
- // Timeouts, constants
- //
- public static long HEARTBEAT_INTERVAL = 3;
- public static long BLOCKREPORT_INTERVAL = 60 * 60 * 1000;
- public static long BLOCKREPORT_INITIAL_DELAY = 0;
- public static final long LEASE_SOFTLIMIT_PERIOD = 60 * 1000;
- public static final long LEASE_HARDLIMIT_PERIOD = 60 * LEASE_SOFTLIMIT_PERIOD;
- public static final long LEASE_RECOVER_PERIOD = 10 * 1000; //in ms
-
- // We need to limit the length and depth of a path in the filesystem. HADOOP-438
- // Currently we set the maximum length to 8k characters and the maximum depth to 1k.
- public static int MAX_PATH_LENGTH = 8000;
- public static int MAX_PATH_DEPTH = 1000;
-
- public static final int BUFFER_SIZE = new Configuration().getInt("io.file.buffer.size", 4096);
- //Used for writing header etc.
- public static final int SMALL_BUFFER_SIZE = Math.min(BUFFER_SIZE/2, 512);
- //TODO mb@media-style.com: should be conf injected?
- public static final long DEFAULT_BLOCK_SIZE = 64 * 1024 * 1024;
- public static final int DEFAULT_DATA_SOCKET_SIZE = 128 * 1024;
- public static final int SIZE_OF_INTEGER = Integer.SIZE / Byte.SIZE;
- // SafeMode actions
- public enum SafeModeAction{ SAFEMODE_LEAVE, SAFEMODE_ENTER, SAFEMODE_GET; }
- // type of the datanode report
- public static enum DatanodeReportType {ALL, LIVE, DEAD }
- /**
- * Distributed upgrade actions:
- *
- * 1. Get upgrade status.
- * 2. Get detailed upgrade status.
- * 3. Proceed with the upgrade if it is stuck, no matter what the status is.
- */
- public static enum UpgradeAction {
- GET_STATUS,
- DETAILED_STATUS,
- FORCE_PROCEED;
- }
- // Version is reflected in the dfs image and edit log files.
- // Version is reflected in the data storage file.
- // Versions are negative.
- // Decrement LAYOUT_VERSION to define a new version.
- public static final int LAYOUT_VERSION = -18;
- // Current version:
- // Support disk space quotas
- }