/**
* 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;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.SocketChannel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.io.util.FileUtils;
import org.apache.cassandra.net.MessagingService;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.Pair;
import org.apache.cassandra.utils.WrappedRunnable;
public class FileStreamTask extends WrappedRunnable
{
private static Logger logger = LoggerFactory.getLogger( FileStreamTask.class );
// 10MB chunks
public static final int CHUNK_SIZE = 10*1024*1024;
// around 10 minutes at the default rpctimeout
public static final int MAX_CONNECT_ATTEMPTS = 8;
private final StreamHeader header;
private final InetAddress to;
public FileStreamTask(StreamHeader header, InetAddress to)
{
this.header = header;
this.to = to;
}
public void runMayThrow() throws IOException
{
SocketChannel channel = connect();
// successfully connected: stream.
// (at this point, if we fail, it is the receiver's job to re-request)
try
{
stream(channel);
}
finally
{
try
{
channel.close();
}
catch (IOException e)
{
if (logger.isDebugEnabled())
logger.debug("error closing socket", e);
}
}
if (logger.isDebugEnabled())
logger.debug("Done streaming " + header.file);
}
private void stream(SocketChannel channel) throws IOException
{
ByteBuffer buffer = MessagingService.instance().constructStreamHeader(header, false);
channel.write(buffer);
assert buffer.remaining() == 0;
if (header.file == null)
return;
RandomAccessFile raf = new RandomAccessFile(new File(header.file.getFilename()), "r");
try
{
FileChannel fc = raf.getChannel();
// stream sections of the file as returned by PendingFile.currentSection
for (Pair<Long, Long> section : header.file.sections)
{
long length = section.right - section.left;
long bytesTransferred = 0;
while (bytesTransferred < length)
{
long toTransfer = Math.min(CHUNK_SIZE, length - bytesTransferred);
long lastWrite = fc.transferTo(section.left + bytesTransferred, toTransfer, channel);
bytesTransferred += lastWrite;
header.file.progress += lastWrite;
}
if (logger.isDebugEnabled())
logger.debug("Bytes transferred " + bytesTransferred + "/" + header.file.size);
}
}
finally
{
FileUtils.closeQuietly(raf);
}
}
/**
* Connects to the destination, with backoff for failed attempts.
* TODO: all nodes on a cluster must currently use the same storage port
* @throws IOException If all attempts fail.
*/
private SocketChannel connect() throws IOException
{
SocketChannel channel = SocketChannel.open();
// force local binding on correctly specified interface.
channel.socket().bind(new InetSocketAddress(FBUtilities.getLocalAddress(), 0));
int attempts = 0;
while (true)
{
try
{
channel.connect(new InetSocketAddress(to, DatabaseDescriptor.getStoragePort()));
// success
return channel;
}
catch (IOException e)
{
if (++attempts >= MAX_CONNECT_ATTEMPTS)
throw e;
long waitms = DatabaseDescriptor.getRpcTimeout() * (long)Math.pow(2, attempts);
logger.warn("Failed attempt " + attempts + " to connect to " + to + " to stream " + header.file + ". Retrying in " + waitms + " ms. (" + e + ")");
try
{
Thread.sleep(waitms);
}
catch (InterruptedException wtf)
{
throw new RuntimeException(wtf);
}
}
}
}
}