| package org.apache.solr.store.hdfs; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.io.IOException; |
| import java.util.EnumSet; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.CreateFlag; |
| import org.apache.hadoop.fs.FSDataOutputStream; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.FsServerDefaults; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.permission.FsPermission; |
| import org.apache.lucene.store.DataOutput; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class HdfsFileWriter extends DataOutput { |
| public static Logger LOG = LoggerFactory.getLogger(HdfsFileWriter.class); |
| |
| public static final String HDFS_SYNC_BLOCK = "solr.hdfs.sync.block"; |
| |
| private final Path path; |
| private FSDataOutputStream outputStream; |
| private long currentPosition; |
| |
| public HdfsFileWriter(FileSystem fileSystem, Path path) throws IOException { |
| LOG.debug("Creating writer on {}", path); |
| this.path = path; |
| |
| Configuration conf = fileSystem.getConf(); |
| FsServerDefaults fsDefaults = fileSystem.getServerDefaults(path); |
| EnumSet<CreateFlag> flags = EnumSet.of(CreateFlag.CREATE, |
| CreateFlag.OVERWRITE); |
| if (Boolean.getBoolean(HDFS_SYNC_BLOCK)) { |
| flags.add(CreateFlag.SYNC_BLOCK); |
| } |
| outputStream = fileSystem.create(path, FsPermission.getDefault() |
| .applyUMask(FsPermission.getUMask(conf)), flags, fsDefaults |
| .getFileBufferSize(), fsDefaults.getReplication(), fsDefaults |
| .getBlockSize(), null); |
| } |
| |
| public long length() { |
| return currentPosition; |
| } |
| |
| public void seek(long pos) throws IOException { |
| LOG.error("Invalid seek called on {}", path); |
| throw new IOException("Seek not supported"); |
| } |
| |
| public void flush() throws IOException { |
| // flush to the network, not guarantees it makes it to the DN (vs hflush) |
| outputStream.flush(); |
| LOG.debug("Flushed file {}", path); |
| } |
| |
| public void close() throws IOException { |
| outputStream.close(); |
| LOG.debug("Closed writer on {}", path); |
| } |
| |
| @Override |
| public void writeByte(byte b) throws IOException { |
| outputStream.write(b & 0xFF); |
| currentPosition++; |
| } |
| |
| @Override |
| public void writeBytes(byte[] b, int offset, int length) throws IOException { |
| outputStream.write(b, offset, length); |
| currentPosition += length; |
| } |
| |
| public long getPosition() { |
| return currentPosition; |
| } |
| } |