hadoop DisabledNameserviceStore 源码
haddop DisabledNameserviceStore 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/store/DisabledNameserviceStore.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.store;
import java.io.IOException;
import java.util.Set;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hdfs.server.federation.store.driver.StateStoreDriver;
import org.apache.hadoop.hdfs.server.federation.store.records.DisabledNameservice;
/**
* State store record to track disabled name services.
*/
@InterfaceAudience.Private
@InterfaceStability.Evolving
public abstract class DisabledNameserviceStore
extends CachedRecordStore<DisabledNameservice> {
public DisabledNameserviceStore(StateStoreDriver driver) {
super(DisabledNameservice.class, driver);
}
/**
* Disable a name service.
*
* @param nsId Identifier of the name service.
* @return If the name service was successfully disabled.
* @throws IOException If the state store could not be queried.
*/
public abstract boolean disableNameservice(String nsId) throws IOException;
/**
* Enable a name service.
*
* @param nsId Identifier of the name service.
* @return If the name service was successfully brought back.
* @throws IOException If the state store could not be queried.
*/
public abstract boolean enableNameservice(String nsId) throws IOException;
/**
* Get a list of disabled name services.
*
* @return List of disabled name services.
* @throws IOException If the state store could not be queried.
*/
public abstract Set<String> getDisabledNameservices() throws IOException;
}
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