UpgradeCommand.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.protocol;
- import java.io.DataInput;
- import java.io.DataOutput;
- import java.io.IOException;
- import org.apache.hadoop.io.Writable;
- import org.apache.hadoop.io.WritableFactories;
- import org.apache.hadoop.io.WritableFactory;
- /**
- * This as a generic distributed upgrade command.
- *
- * During the upgrade cluster components send upgrade commands to each other
- * in order to obtain or share information with them.
- * It is supposed that each upgrade defines specific upgrade command by
- * deriving them from this class.
- * The upgrade command contains version of the upgrade, which is verified
- * on the receiving side and current status of the upgrade.
- */
- public class UpgradeCommand extends DatanodeCommand {
- final static int UC_ACTION_UNKNOWN = DatanodeProtocol.DNA_UNKNOWN;
- public final static int UC_ACTION_REPORT_STATUS = 100; // report upgrade status
- public final static int UC_ACTION_START_UPGRADE = 101; // start upgrade
- private int version;
- private short upgradeStatus;
- public UpgradeCommand() {
- super(UC_ACTION_UNKNOWN);
- this.version = 0;
- this.upgradeStatus = 0;
- }
- public UpgradeCommand(int action, int version, short status) {
- super(action);
- this.version = version;
- this.upgradeStatus = status;
- }
- public int getVersion() {
- return this.version;
- }
- public short getCurrentStatus() {
- return this.upgradeStatus;
- }
- /////////////////////////////////////////////////
- // Writable
- /////////////////////////////////////////////////
- static { // register a ctor
- WritableFactories.setFactory
- (UpgradeCommand.class,
- new WritableFactory() {
- public Writable newInstance() { return new UpgradeCommand(); }
- });
- }
- /**
- */
- public void write(DataOutput out) throws IOException {
- super.write(out);
- out.writeInt(this.version);
- out.writeShort(this.upgradeStatus);
- }
- /**
- */
- public void readFields(DataInput in) throws IOException {
- super.readFields(in);
- this.version = in.readInt();
- this.upgradeStatus = in.readShort();
- }
- }