| /** |
| * 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.datanode.fsdataset; |
| |
| import java.io.Closeable; |
| import java.io.FileDescriptor; |
| import java.io.FileOutputStream; |
| import java.io.Flushable; |
| import java.io.OutputStream; |
| import java.io.IOException; |
| |
| import org.apache.hadoop.hdfs.server.datanode.DataNode; |
| import org.apache.hadoop.hdfs.server.datanode.FileIoProvider; |
| import org.apache.hadoop.io.IOUtils; |
| import org.apache.hadoop.io.nativeio.NativeIOException; |
| import org.apache.hadoop.util.DataChecksum; |
| import org.slf4j.Logger; |
| |
| /** |
| * Contains the output streams for the data and checksum of a replica. |
| */ |
| public class ReplicaOutputStreams implements Closeable { |
| public static final Logger LOG = DataNode.LOG; |
| |
| private FileDescriptor outFd = null; |
| /** Stream to block. */ |
| private OutputStream dataOut; |
| /** Stream to checksum. */ |
| private final OutputStream checksumOut; |
| private final DataChecksum checksum; |
| private final FsVolumeSpi volume; |
| private final FileIoProvider fileIoProvider; |
| |
| /** |
| * Create an object with a data output stream, a checksum output stream |
| * and a checksum. |
| */ |
| public ReplicaOutputStreams( |
| OutputStream dataOut, OutputStream checksumOut, DataChecksum checksum, |
| FsVolumeSpi volume, FileIoProvider fileIoProvider) { |
| |
| this.dataOut = dataOut; |
| this.checksum = checksum; |
| this.checksumOut = checksumOut; |
| this.volume = volume; |
| this.fileIoProvider = fileIoProvider; |
| |
| try { |
| if (this.dataOut instanceof FileOutputStream) { |
| this.outFd = ((FileOutputStream)this.dataOut).getFD(); |
| } else { |
| LOG.debug("Could not get file descriptor for outputstream of class " + |
| this.dataOut.getClass()); |
| } |
| } catch (IOException e) { |
| LOG.warn("Could not get file descriptor for outputstream of class " + |
| this.dataOut.getClass()); |
| } |
| } |
| |
| public FileDescriptor getOutFd() { |
| return outFd; |
| } |
| |
| /** @return the data output stream. */ |
| public OutputStream getDataOut() { |
| return dataOut; |
| } |
| |
| /** @return the checksum output stream. */ |
| public OutputStream getChecksumOut() { |
| return checksumOut; |
| } |
| |
| /** @return the checksum. */ |
| public DataChecksum getChecksum() { |
| return checksum; |
| } |
| |
| /** @return is writing to a transient storage? */ |
| public boolean isTransientStorage() { |
| return volume.isTransientStorage(); |
| } |
| |
| @Override |
| public void close() { |
| IOUtils.closeStream(dataOut); |
| IOUtils.closeStream(checksumOut); |
| } |
| |
| public void closeDataStream() throws IOException { |
| dataOut.close(); |
| dataOut = null; |
| } |
| |
| /** |
| * Sync the data stream if it supports it. |
| */ |
| public void syncDataOut() throws IOException { |
| if (dataOut instanceof FileOutputStream) { |
| fileIoProvider.sync(volume, (FileOutputStream) dataOut); |
| } |
| } |
| |
| /** |
| * Sync the checksum stream if it supports it. |
| */ |
| public void syncChecksumOut() throws IOException { |
| if (checksumOut instanceof FileOutputStream) { |
| fileIoProvider.sync(volume, (FileOutputStream) checksumOut); |
| } |
| } |
| |
| /** |
| * Flush the data stream if it supports it. |
| */ |
| public void flushDataOut() throws IOException { |
| if (dataOut != null) { |
| fileIoProvider.flush(volume, dataOut); |
| } |
| } |
| |
| /** |
| * Flush the checksum stream if it supports it. |
| */ |
| public void flushChecksumOut() throws IOException { |
| if (checksumOut != null) { |
| fileIoProvider.flush(volume, checksumOut); |
| } |
| } |
| |
| public void writeDataToDisk(byte[] b, int off, int len) |
| throws IOException { |
| dataOut.write(b, off, len); |
| } |
| |
| public void syncFileRangeIfPossible(long offset, long nbytes, |
| int flags) throws NativeIOException { |
| fileIoProvider.syncFileRange( |
| volume, outFd, offset, nbytes, flags); |
| } |
| |
| public void dropCacheBehindWrites(String identifier, |
| long offset, long len, int flags) throws NativeIOException { |
| fileIoProvider.posixFadvise( |
| volume, identifier, outFd, offset, len, flags); |
| } |
| } |