| /** |
| * 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(); |
| } |