InterDatanodeProtocol.java
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上传日期:2018-01-08
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- /**
- * 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;
- }