| /** |
| * 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 com.google.protobuf.ByteString; |
| import org.apache.hadoop.hdfs.hdfsdb.WriteBatch; |
| import org.apache.hadoop.hdfs.hdfsdb.WriteOptions; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.ByteOrder; |
| |
| class LevelDBRWTransaction extends RWTransaction { |
| private static final WriteOptions WRITE_OPTIONS = |
| new WriteOptions().skipWal(true); |
| private final WriteBatch batch = new WriteBatch(); |
| private final org.apache.hadoop.hdfs.hdfsdb.DB hdfsdb; |
| LevelDBRWTransaction(FSDirectory fsd) { |
| super(fsd); |
| this.hdfsdb = fsd.getLevelDb(); |
| } |
| |
| @Override |
| FlatINode getINode(long id) { |
| return LevelDBROTransaction.getFlatINode(id, hdfsdb, |
| LevelDBROTransaction.OPTIONS); |
| } |
| |
| @Override |
| long getChild(long parentId, ByteBuffer localName) { |
| return LevelDBROTransaction.getChild(parentId, localName, hdfsdb, |
| LevelDBROTransaction.OPTIONS); |
| } |
| |
| @Override |
| DBChildrenView childrenView(long parent) { |
| return LevelDBROTransaction.getChildrenView(parent, hdfsdb, |
| LevelDBROTransaction.OPTIONS); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| super.close(); |
| batch.close(); |
| } |
| |
| void putINode(long id, ByteString inode) { |
| batch.put(LevelDBROTransaction.inodeKey(id), inode.toByteArray()); |
| } |
| |
| void putChild(long parentId, ByteBuffer localName, long id) { |
| byte[] v = new byte[8]; |
| ByteBuffer.wrap(v).order(ByteOrder.LITTLE_ENDIAN).asLongBuffer().put(id); |
| batch.put(LevelDBROTransaction.inodeChildKey(parentId, localName), v); |
| } |
| |
| void deleteINode(long inodeId) { |
| batch.delete(LevelDBROTransaction.inodeKey(inodeId)); |
| } |
| |
| void deleteChild(long parentId, ByteBuffer localName) { |
| batch.delete(LevelDBROTransaction.inodeChildKey(parentId, localName)); |
| } |
| |
| void commit() { |
| try { |
| hdfsdb.write(WRITE_OPTIONS, batch); |
| fsd.clearCurrentLevelDBSnapshot(); |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |