hadoop StateStoreVersion 源码
haddop StateStoreVersion 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/store/records/StateStoreVersion.java
/**
* 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.federation.store.records;
import java.util.SortedMap;
import java.util.TreeMap;
import org.apache.hadoop.hdfs.server.federation.store.driver.StateStoreSerializer;
/**
* Entry to track the version of the State Store data stored in the State Store
* by a Router.
*/
public abstract class StateStoreVersion extends BaseRecord {
public static StateStoreVersion newInstance() {
return StateStoreSerializer.newRecord(StateStoreVersion.class);
}
public static StateStoreVersion newInstance(long membershipVersion,
long mountTableVersion) {
StateStoreVersion record = newInstance();
record.setMembershipVersion(membershipVersion);
record.setMountTableVersion(mountTableVersion);
return record;
}
public abstract long getMembershipVersion();
public abstract void setMembershipVersion(long version);
public abstract long getMountTableVersion();
public abstract void setMountTableVersion(long version);
@Override
public SortedMap<String, String> getPrimaryKeys() {
// This record is not stored directly, no key needed
SortedMap<String, String> map = new TreeMap<String, String>();
return map;
}
@Override
public long getExpirationMs() {
// This record is not stored directly, no expiration needed
return -1;
}
@Override
public void setDateModified(long time) {
// We don't store this record directly
}
@Override
public long getDateModified() {
// We don't store this record directly
return 0;
}
@Override
public void setDateCreated(long time) {
// We don't store this record directly
}
@Override
public long getDateCreated() {
// We don't store this record directly
return 0;
}
@Override
public String toString() {
return "Membership: " + getMembershipVersion() +
" Mount Table: " + getMountTableVersion();
}
}
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