/**
* 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 io.hops.exception.StorageException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.security.AccessControlException;
import java.io.IOException;
import java.util.Set;
/**
* Namesystem operations.
*/
@InterfaceAudience.Private
public interface Namesystem extends SafeMode {
/**
* Is this name system running?
*/
public boolean isRunning();
/**
* Check if the user has superuser privilege.
*/
public void checkSuperuserPrivilege() throws AccessControlException;
/**
* @return the block pool ID
*/
public String getBlockPoolId();
public boolean isGenStampInFuture(long generationStamp)
throws StorageException;
public void adjustSafeModeBlockTotals(int deltaSafe, int deltaTotal)
throws IOException;
/**
* Is it a Leader
*/
public boolean isLeader();
/**
* Returns the namenode id
*/
public long getNamenodeId();
/**
* Get the associated NameNode
* @return the @link{NameNode}
*/
public NameNode getNameNode();
/**
* Adjust the safeblocks if the current namenode is in safemode
* @param safeBlocks
* list of blocks to be considered safe
* @throws IOException
*/
public void adjustSafeModeBlocks(Set<Long> safeBlocks) throws IOException;
}