NamespaceInfo.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.hdfs.protocol.FSConstants;
- import org.apache.hadoop.hdfs.server.common.Storage;
- import org.apache.hadoop.hdfs.server.common.StorageInfo;
- import org.apache.hadoop.io.UTF8;
- import org.apache.hadoop.io.Writable;
- import org.apache.hadoop.io.WritableFactories;
- import org.apache.hadoop.io.WritableFactory;
- /**
- * NamespaceInfo is returned by the name-node in reply
- * to a data-node handshake.
- *
- */
- public class NamespaceInfo extends StorageInfo implements Writable {
- String buildVersion;
- int distributedUpgradeVersion;
- public NamespaceInfo() {
- super();
- buildVersion = null;
- }
-
- public NamespaceInfo(int nsID, long cT, int duVersion) {
- super(FSConstants.LAYOUT_VERSION, nsID, cT);
- buildVersion = Storage.getBuildVersion();
- this.distributedUpgradeVersion = duVersion;
- }
-
- public String getBuildVersion() {
- return buildVersion;
- }
- public int getDistributedUpgradeVersion() {
- return distributedUpgradeVersion;
- }
-
- /////////////////////////////////////////////////
- // Writable
- /////////////////////////////////////////////////
- static { // register a ctor
- WritableFactories.setFactory
- (NamespaceInfo.class,
- new WritableFactory() {
- public Writable newInstance() { return new NamespaceInfo(); }
- });
- }
- public void write(DataOutput out) throws IOException {
- UTF8.writeString(out, getBuildVersion());
- out.writeInt(getLayoutVersion());
- out.writeInt(getNamespaceID());
- out.writeLong(getCTime());
- out.writeInt(getDistributedUpgradeVersion());
- }
- public void readFields(DataInput in) throws IOException {
- buildVersion = UTF8.readString(in);
- layoutVersion = in.readInt();
- namespaceID = in.readInt();
- cTime = in.readLong();
- distributedUpgradeVersion = in.readInt();
- }
- }