/**
* 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.protocol;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.ipc.VersionedProtocol;
/** An inter-datanode protocol for updating generation stamp
*/
public interface InterDatanodeProtocol extends VersionedProtocol {
public static final Log LOG = LogFactory.getLog(InterDatanodeProtocol.class);
/**
* 3: added a finalize parameter to updateBlock
*/
public static final long versionID = 3L;
/** @return the BlockMetaDataInfo of a block;
* null if the block is not found
*/
BlockMetaDataInfo getBlockMetaDataInfo(Block block) throws IOException;
/**
* Update the block to the new generation stamp and length.
*/
void updateBlock(Block oldblock, Block newblock, boolean finalize) throws IOException;
}