hadoop Namesystem 源码
haddop Namesystem 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/Namesystem.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.namenode;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockCollection;
import org.apache.hadoop.hdfs.server.namenode.ha.HAContext;
import org.apache.hadoop.hdfs.util.RwLock;
/** Namesystem operations. */
@InterfaceAudience.Private
public interface Namesystem extends RwLock, SafeMode {
/**
* Is this name system running?
*/
boolean isRunning();
BlockCollection getBlockCollection(long id);
FSDirectory getFSDirectory();
void startSecretManagerIfNecessary();
boolean isInSnapshot(long blockCollectionID);
CacheManager getCacheManager();
HAContext getHAContext();
/**
* @return Whether the namenode is transitioning to active state and is in the
* middle of the starting active services.
*/
boolean inTransitionToActive();
/**
* Remove xAttr from the inode.
* @param id
* @param xattrName
* @throws IOException
*/
void removeXattr(long id, String xattrName) throws IOException;
/**
* Check if snapshot roots are created for all existing snapshottable
* directories. Create them if not.
*/
void checkAndProvisionSnapshotTrashRoots();
}
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