| /** |
| * 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.io.IOException; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState; |
| import org.apache.hadoop.ha.ServiceFailedException; |
| import org.apache.hadoop.hdfs.server.namenode.NameNode; |
| import org.apache.hadoop.hdfs.server.namenode.NameNode.OperationCategory; |
| |
| /** |
| * Active state of the namenode. In this state, namenode provides the namenode |
| * service and handles operations of type {@link OperationCategory#WRITE} and |
| * {@link OperationCategory#READ}. |
| */ |
| @InterfaceAudience.Private |
| public class ActiveState extends HAState { |
| public ActiveState() { |
| super(HAServiceState.ACTIVE); |
| } |
| |
| @Override |
| public void checkOperation(HAContext context, OperationCategory op) { |
| return; // All operations are allowed in active state |
| } |
| |
| @Override |
| public boolean shouldPopulateReplQueues() { |
| return true; |
| } |
| |
| @Override |
| public void setState(HAContext context, HAState s) throws ServiceFailedException { |
| if (s == NameNode.STANDBY_STATE) { |
| setStateInternal(context, s); |
| return; |
| } |
| super.setState(context, s); |
| } |
| |
| @Override |
| public void enterState(HAContext context) throws ServiceFailedException { |
| try { |
| context.startActiveServices(); |
| } catch (IOException e) { |
| throw new ServiceFailedException("Failed to start active services", e); |
| } |
| } |
| |
| @Override |
| public void exitState(HAContext context) throws ServiceFailedException { |
| try { |
| context.stopActiveServices(); |
| } catch (IOException e) { |
| throw new ServiceFailedException("Failed to stop active services", e); |
| } |
| } |
| |
| } |