HdfsConstants.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.server.common;
- /************************************
- * Some handy internal HDFS constants
- *
- ************************************/
- public interface HdfsConstants {
- /**
- * Type of the node
- */
- static public enum NodeType {
- NAME_NODE,
- DATA_NODE;
- }
- // Startup options
- static public enum StartupOption{
- FORMAT ("-format"),
- REGULAR ("-regular"),
- UPGRADE ("-upgrade"),
- ROLLBACK("-rollback"),
- FINALIZE("-finalize"),
- IMPORT ("-importCheckpoint");
-
- private String name = null;
- private StartupOption(String arg) {this.name = arg;}
- public String getName() {return name;}
- }
- // Timeouts for communicating with DataNode for streaming writes/reads
- public static int READ_TIMEOUT = 60 * 1000;
- public static int WRITE_TIMEOUT = 8 * 60 * 1000;
- public static int WRITE_TIMEOUT_EXTENSION = 5 * 1000; //for write pipeline
- }