UpgradeManagerNamenode.java
上传用户:quxuerui
上传日期:2018-01-08
资源大小:41811k
文件大小:6k
- /**
- * 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;
- import java.util.SortedSet;
- import java.io.IOException;
- import org.apache.hadoop.hdfs.protocol.FSConstants;
- import org.apache.hadoop.hdfs.protocol.FSConstants.UpgradeAction;
- import org.apache.hadoop.hdfs.server.common.HdfsConstants;
- import org.apache.hadoop.hdfs.server.common.IncorrectVersionException;
- import org.apache.hadoop.hdfs.server.common.UpgradeManager;
- import org.apache.hadoop.hdfs.server.common.UpgradeObjectCollection;
- import org.apache.hadoop.hdfs.server.common.UpgradeStatusReport;
- import org.apache.hadoop.hdfs.server.common.Upgradeable;
- import org.apache.hadoop.hdfs.server.protocol.UpgradeCommand;
- /**
- * Upgrade manager for name-nodes.
- *
- * Distributed upgrades for a name-node starts when the safe mode conditions
- * are met and the name-node is about to exit it.
- * At this point the name-node enters manual safe mode which will remain
- * on until the upgrade is completed.
- * After that the name-nodes processes upgrade commands from data-nodes
- * and updates its status.
- */
- class UpgradeManagerNamenode extends UpgradeManager {
- public HdfsConstants.NodeType getType() {
- return HdfsConstants.NodeType.NAME_NODE;
- }
- /**
- * Start distributed upgrade.
- * Instantiates distributed upgrade objects.
- *
- * @return true if distributed upgrade is required or false otherwise
- * @throws IOException
- */
- public synchronized boolean startUpgrade() throws IOException {
- if(!upgradeState) {
- initializeUpgrade();
- if(!upgradeState) return false;
- // write new upgrade state into disk
- FSNamesystem.getFSNamesystem().getFSImage().writeAll();
- }
- assert currentUpgrades != null : "currentUpgrades is null";
- this.broadcastCommand = currentUpgrades.first().startUpgrade();
- NameNode.LOG.info("n Distributed upgrade for NameNode version "
- + getUpgradeVersion() + " to current LV "
- + FSConstants.LAYOUT_VERSION + " is started.");
- return true;
- }
- synchronized UpgradeCommand processUpgradeCommand(UpgradeCommand command
- ) throws IOException {
- NameNode.LOG.debug("n Distributed upgrade for NameNode version "
- + getUpgradeVersion() + " to current LV "
- + FSConstants.LAYOUT_VERSION + " is processing upgrade command: "
- + command.getAction() + " status = " + getUpgradeStatus() + "%");
- if(currentUpgrades == null) {
- NameNode.LOG.info("Ignoring upgrade command: "
- + command.getAction() + " version " + command.getVersion()
- + ". No distributed upgrades are currently running on the NameNode");
- return null;
- }
- UpgradeObjectNamenode curUO = (UpgradeObjectNamenode)currentUpgrades.first();
- if(command.getVersion() != curUO.getVersion())
- throw new IncorrectVersionException(command.getVersion(),
- "UpgradeCommand", curUO.getVersion());
- UpgradeCommand reply = curUO.processUpgradeCommand(command);
- if(curUO.getUpgradeStatus() < 100) {
- return reply;
- }
- // current upgrade is done
- curUO.completeUpgrade();
- NameNode.LOG.info("n Distributed upgrade for NameNode version "
- + curUO.getVersion() + " to current LV "
- + FSConstants.LAYOUT_VERSION + " is complete.");
- // proceede with the next one
- currentUpgrades.remove(curUO);
- if(currentUpgrades.isEmpty()) { // all upgrades are done
- completeUpgrade();
- } else { // start next upgrade
- curUO = (UpgradeObjectNamenode)currentUpgrades.first();
- this.broadcastCommand = curUO.startUpgrade();
- }
- return reply;
- }
- public synchronized void completeUpgrade() throws IOException {
- // set and write new upgrade state into disk
- setUpgradeState(false, FSConstants.LAYOUT_VERSION);
- FSNamesystem.getFSNamesystem().getFSImage().writeAll();
- currentUpgrades = null;
- broadcastCommand = null;
- FSNamesystem.getFSNamesystem().leaveSafeMode(false);
- }
- UpgradeStatusReport distributedUpgradeProgress(UpgradeAction action
- ) throws IOException {
- boolean isFinalized = false;
- if(currentUpgrades == null) { // no upgrades are in progress
- FSImage fsimage = FSNamesystem.getFSNamesystem().getFSImage();
- isFinalized = fsimage.isUpgradeFinalized();
- if(isFinalized) // upgrade is finalized
- return null; // nothing to report
- return new UpgradeStatusReport(fsimage.getLayoutVersion(),
- (short)101, isFinalized);
- }
- UpgradeObjectNamenode curUO = (UpgradeObjectNamenode)currentUpgrades.first();
- boolean details = false;
- switch(action) {
- case GET_STATUS:
- break;
- case DETAILED_STATUS:
- details = true;
- break;
- case FORCE_PROCEED:
- curUO.forceProceed();
- }
- return curUO.getUpgradeStatusReport(details);
- }
- public static void main(String[] args) throws IOException {
- UpgradeManagerNamenode um = new UpgradeManagerNamenode();
- SortedSet<Upgradeable> uos;
- uos = UpgradeObjectCollection.getDistributedUpgrades(-4,
- HdfsConstants.NodeType.NAME_NODE);
- System.out.println(uos.size());
- um.startUpgrade();
- }
- }