| /** |
| * 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. |
| */ |
| |
| /** |
| * The resolver package contains indepedent data resolvers used in HDFS |
| * federation. The data resolvers collect data from the cluster, including from |
| * the state store. The resolvers expose APIs used by HDFS federation to collect |
| * aggregated, cached data for use in Real-time request processing. The |
| * resolvers are perf-sensitive and are used in the flow of the |
| * {@link RouterRpcServer} request path. |
| * <p> |
| * The principal resolvers are: |
| * <ul> |
| * <li>{@link ActiveNamenodeResolver} Real-time interface for locating the most |
| * recently active NN for a nameservice. |
| * <li>{@link FileSubclusterResolver} Real-time interface for determining the NN |
| * and local file path for a given file/folder based on the global namespace |
| * path. |
| * </ul> |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Evolving |
| package org.apache.hadoop.hdfs.server.federation.resolver; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
