hadoop FederationNamenodeContext 源码
haddop FederationNamenodeContext 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/resolver/FederationNamenodeContext.java
/**
* 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.federation.resolver;
/**
* Interface for a discovered NN and its current server endpoints.
*/
public interface FederationNamenodeContext {
/**
* Get the RPC server address of the namenode.
*
* @return RPC server address in the form of host:port.
*/
String getRpcAddress();
/**
* Get the Service RPC server address of the namenode.
*
* @return Service RPC server address in the form of host:port.
*/
String getServiceAddress();
/**
* Get the Lifeline RPC server address of the namenode.
*
* @return Lifeline RPC server address in the form of host:port.
*/
String getLifelineAddress();
/**
* Get the Scheme of web address of the namenode.
*
* @return Scheme of web address (HTTP/HTTPS).
*/
String getWebScheme();
/**
* Get the HTTP(s) server address of the namenode.
*
* @return HTTP(s) address in the form of host:port.
*/
String getWebAddress();
/**
* Get the unique key representing the namenode.
*
* @return Combination of the nameservice and the namenode IDs.
*/
String getNamenodeKey();
/**
* Identifier for the nameservice/namespace.
*
* @return Namenode nameservice identifier.
*/
String getNameserviceId();
/**
* Identifier for the namenode.
*
* @return String
*/
String getNamenodeId();
/**
* The current state of the namenode (active, standby, etc).
*
* @return FederationNamenodeServiceState State of the namenode.
*/
FederationNamenodeServiceState getState();
/**
* The update date.
*
* @return Long with the update date.
*/
long getDateModified();
}
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