hadoop ReadOnly 源码
haddop ReadOnly 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/ReadOnly.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.namenode.ha;
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.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* Marker interface used to annotate methods that are readonly.
*/
@Inherited
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@InterfaceAudience.Private
@InterfaceStability.Evolving
public @interface ReadOnly {
/**
* @return if true, the annotated method may update the last accessed time
* while performing its read, if access time is enabled.
*/
boolean atimeAffected() default false;
/**
* @return if true, the target method should only be invoked on the active
* namenode. This applies to operations that need to access information that
* is only available on the active namenode.
*/
boolean activeOnly() default false;
/**
* @return if true, when processing the rpc call of the target method, the
* server side will wait if server state id is behind client (msync). If
* false, the method will be processed regardless of server side state.
*/
boolean isCoordinated() default false;
}
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