/*
* 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.cassandra.streaming.compress;
import java.io.*;
import java.net.InetAddress;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.SocketChannel;
import java.util.ArrayList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.io.compress.CompressionMetadata;
import org.apache.cassandra.io.util.FileUtils;
import org.apache.cassandra.io.util.RandomAccessReader;
import org.apache.cassandra.metrics.StreamingMetrics;
import org.apache.cassandra.net.MessagingService;
import org.apache.cassandra.streaming.FileStreamTask;
import org.apache.cassandra.streaming.StreamHeader;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.Pair;
/**
* FileStreamTask for compressed SSTable.
*
* This class sends relevant part of compressed file directly using nio if available.
*/
public class CompressedFileStreamTask extends FileStreamTask
{
private static final Logger logger = LoggerFactory.getLogger(CompressedFileStreamTask.class);
// 10MB chunks
public static final int CHUNK_SIZE = 10*1024*1024;
public CompressedFileStreamTask(StreamHeader header, InetAddress to)
{
super(header, to);
}
protected void stream() throws IOException
{
assert header.file.compressionInfo != null;
SocketChannel sc = socket.getChannel();
byte[] transferBuffer = null;
// write header
ByteBuffer headerBuffer = MessagingService.instance().constructStreamHeader(header, false, MessagingService.instance().getVersion(to));
socket.getOutputStream().write(ByteBufferUtil.getArray(headerBuffer));
RandomAccessReader file = RandomAccessReader.open(new File(header.file.getFilename()), true);
FileChannel fc = file.getChannel();
StreamingMetrics.activeStreamsOutbound.inc();
// calculate chunks to transfer. we want to send continuous chunks altogether.
List<Pair<Long, Long>> sections = getTransferSections(header.file.compressionInfo.chunks);
try
{
long totalBytesTransferred = 0;
// stream each of the required sections of the file
for (Pair<Long, Long> section : sections)
{
// length of the section to stream
long length = section.right - section.left;
// tracks write progress
long bytesTransferred = 0;
while (bytesTransferred < length)
{
int toTransfer = (int) Math.min(CHUNK_SIZE, length - bytesTransferred);
long lastWrite;
if (sc != null)
{
lastWrite = fc.transferTo(section.left + bytesTransferred, toTransfer, sc);
throttle.throttleDelta(lastWrite);
}
else
{
// NIO is not available. Fall back to normal streaming.
// This happens when inter-node encryption is turned on.
if (transferBuffer == null)
transferBuffer = new byte[CHUNK_SIZE];
file.readFully(transferBuffer, 0, toTransfer);
socket.getOutputStream().write(transferBuffer, 0, toTransfer);
throttle.throttleDelta(toTransfer);
lastWrite = toTransfer;
}
totalBytesTransferred += lastWrite;
bytesTransferred += lastWrite;
header.file.progress += lastWrite;
}
logger.debug("Bytes transferred " + bytesTransferred + "/" + header.file.size);
}
StreamingMetrics.totalOutgoingBytes.inc(totalBytesTransferred);
metrics.outgoingBytes.inc(totalBytesTransferred);
// receive reply confirmation
receiveReply();
}
finally
{
StreamingMetrics.activeStreamsOutbound.dec();
// no matter what happens close file
FileUtils.closeQuietly(file);
}
}
// chunks are assumed to be sorted by offset
private List<Pair<Long, Long>> getTransferSections(CompressionMetadata.Chunk[] chunks)
{
List<Pair<Long, Long>> transferSections = new ArrayList<Pair<Long, Long>>();
Pair<Long, Long> lastSection = null;
for (CompressionMetadata.Chunk chunk : chunks)
{
if (lastSection != null)
{
if (chunk.offset == lastSection.right)
{
// extend previous section to end of this chunk
lastSection = Pair.create(lastSection.left, chunk.offset + chunk.length + 4); // 4 bytes for CRC
}
else
{
transferSections.add(lastSection);
lastSection = Pair.create(chunk.offset, chunk.offset + chunk.length + 4);
}
}
else
{
lastSection = Pair.create(chunk.offset, chunk.offset + chunk.length + 4);
}
}
if (lastSection != null)
transferSections.add(lastSection);
return transferSections;
}
}