org.apache.hadoop.hdfs.server.namenode.Namesystem Maven / Gradle / Ivy
/**
* 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,
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* See the License for the specific language governing permissions and
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package org.apache.hadoop.hdfs.server.namenode;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hdfs.server.namenode.NameNode.OperationCategory;
import org.apache.hadoop.hdfs.util.RwLock;
import org.apache.hadoop.ipc.StandbyException;
import org.apache.hadoop.security.AccessControlException;
/** Namesystem operations. */
@InterfaceAudience.Private
public interface Namesystem extends RwLock, 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 isInStandbyState();
public boolean isGenStampInFuture(long generationStamp);
public void adjustSafeModeBlockTotals(int deltaSafe, int deltaTotal);
public void checkOperation(OperationCategory read) throws StandbyException;
}