UpgradeManager.java
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上传日期:2018-01-08
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文件大小:3k
- /**
- * 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.common;
- import java.io.IOException;
- import java.util.SortedSet;
- import org.apache.hadoop.hdfs.protocol.FSConstants;
- import org.apache.hadoop.hdfs.server.protocol.UpgradeCommand;
- /**
- * Generic upgrade manager.
- *
- * {@link #broadcastCommand} is the command that should be
- *
- */
- public abstract class UpgradeManager {
- protected SortedSet<Upgradeable> currentUpgrades = null;
- protected boolean upgradeState = false; // true if upgrade is in progress
- protected int upgradeVersion = 0;
- protected UpgradeCommand broadcastCommand = null;
- public synchronized UpgradeCommand getBroadcastCommand() {
- return this.broadcastCommand;
- }
- public boolean getUpgradeState() {
- return this.upgradeState;
- }
- public int getUpgradeVersion(){
- return this.upgradeVersion;
- }
- public void setUpgradeState(boolean uState, int uVersion) {
- this.upgradeState = uState;
- this.upgradeVersion = uVersion;
- }
- public SortedSet<Upgradeable> getDistributedUpgrades() throws IOException {
- return UpgradeObjectCollection.getDistributedUpgrades(
- getUpgradeVersion(), getType());
- }
- public short getUpgradeStatus() {
- if(currentUpgrades == null)
- return 100;
- return currentUpgrades.first().getUpgradeStatus();
- }
- public boolean initializeUpgrade() throws IOException {
- currentUpgrades = getDistributedUpgrades();
- if(currentUpgrades == null) {
- // set new upgrade state
- setUpgradeState(false, FSConstants.LAYOUT_VERSION);
- return false;
- }
- Upgradeable curUO = currentUpgrades.first();
- // set and write new upgrade state into disk
- setUpgradeState(true, curUO.getVersion());
- return true;
- }
- public boolean isUpgradeCompleted() {
- if (currentUpgrades == null) {
- return true;
- }
- return false;
- }
- public abstract HdfsConstants.NodeType getType();
- public abstract boolean startUpgrade() throws IOException;
- public abstract void completeUpgrade() throws IOException;
- }