hadoop AtMostOnce 源码
haddop AtMostOnce 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/retry/AtMostOnce.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.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 {
}
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