hadoop DataNodeLockManager 源码
haddop DataNodeLockManager 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/DataNodeLockManager.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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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;
/**
* Use for manage a set of lock for datanode.
*/
public interface DataNodeLockManager<T extends AutoCloseDataSetLock> {
/**
* Acquire block pool level first if you want to Acquire volume lock.
* Or only acquire block pool level lock.
*/
enum LockLevel {
BLOCK_POOl,
VOLUME
}
/**
* Acquire readLock and then lock.
*/
T readLock(LockLevel level, String... resources);
/**
* Acquire writeLock and then lock.
*/
T writeLock(LockLevel level, String... resources);
/**
* Add a lock to LockManager.
*/
void addLock(LockLevel level, String... resources);
/**
* Remove a lock from LockManager.
*/
void removeLock(LockLevel level, String... resources);
/**
* LockManager may need to back hook.
*/
void hook();
}
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