| /** |
| * 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.io.retry; |
| |
| import java.lang.annotation.ElementType; |
| import java.lang.annotation.Inherited; |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import java.lang.annotation.Target; |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| /** |
| * Used to mark certain methods of an interface with at-most-once semantics. |
| * |
| * Server must guarantee that methods are executed at most once, by keeping |
| * a retry cache. The previous response must be returned when duplicate |
| * requests are received. Because of these guarantee, a client can retry |
| * this request on failover and other network failure conditions. |
| */ |
| @Inherited |
| @Retention(RetentionPolicy.RUNTIME) |
| @Target(ElementType.METHOD) |
| @InterfaceStability.Evolving |
| public @interface AtMostOnce { |
| |
| } |
