1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one |
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3 | * or more contributor license agreements. See the NOTICE file |
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4 | * distributed with this work for additional information |
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5 | * regarding copyright ownership. The ASF licenses this file |
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6 | * to you under the Apache License, Version 2.0 (the |
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7 | * "License"); you may not use this file except in compliance |
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8 | * with the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | |
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19 | package org.apache.hadoop.hdfs.server.protocol; |
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20 | |
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21 | import java.io.IOException; |
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22 | |
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23 | import org.apache.commons.logging.Log; |
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24 | import org.apache.commons.logging.LogFactory; |
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25 | import org.apache.hadoop.hdfs.protocol.Block; |
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26 | import org.apache.hadoop.ipc.VersionedProtocol; |
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27 | |
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28 | /** An inter-datanode protocol for updating generation stamp |
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29 | */ |
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30 | public interface InterDatanodeProtocol extends VersionedProtocol { |
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31 | public static final Log LOG = LogFactory.getLog(InterDatanodeProtocol.class); |
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32 | |
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33 | /** |
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34 | * 3: added a finalize parameter to updateBlock |
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35 | */ |
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36 | public static final long versionID = 3L; |
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37 | |
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38 | /** @return the BlockMetaDataInfo of a block; |
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39 | * null if the block is not found |
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40 | */ |
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41 | BlockMetaDataInfo getBlockMetaDataInfo(Block block) throws IOException; |
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42 | |
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43 | /** |
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44 | * Update the block to the new generation stamp and length. |
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45 | */ |
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46 | void updateBlock(Block oldblock, Block newblock, boolean finalize) throws IOException; |
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47 | } |
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