hadoop RouterStateManager 源码
haddop RouterStateManager 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterStateManager.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.router;
import java.io.IOException;
import org.apache.hadoop.hdfs.server.federation.store.protocol.EnterSafeModeRequest;
import org.apache.hadoop.hdfs.server.federation.store.protocol.EnterSafeModeResponse;
import org.apache.hadoop.hdfs.server.federation.store.protocol.GetSafeModeRequest;
import org.apache.hadoop.hdfs.server.federation.store.protocol.GetSafeModeResponse;
import org.apache.hadoop.hdfs.server.federation.store.protocol.LeaveSafeModeRequest;
import org.apache.hadoop.hdfs.server.federation.store.protocol.LeaveSafeModeResponse;
/**
* Interface of managing the Router state.
*/
public interface RouterStateManager {
/**
* Enter safe mode and change Router state to RouterServiceState#SAFEMODE.
* @param request Request to enter safe mode.
* @return Response to enter safe mode.
* @throws IOException If it cannot perform the operation.
*/
EnterSafeModeResponse enterSafeMode(EnterSafeModeRequest request)
throws IOException;
/**
* Leave safe mode and change Router state to RouterServiceState#RUNNING.
* @param request Request to leave safe mode.
* @return Response to leave safe mode.
* @throws IOException If it cannot perform the operation.
*/
LeaveSafeModeResponse leaveSafeMode(LeaveSafeModeRequest request)
throws IOException;
/**
* Verify if current Router state is safe mode.
* @param request Request to get the safe mode state.
* @return Response to get the safe mode state.
* @throws IOException If it cannot perform the operation.
*/
GetSafeModeResponse getSafeMode(GetSafeModeRequest request)
throws IOException;
}
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