/*
* 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.DataInputStream;
import java.io.IOException;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import com.google.common.base.Throwables;
import org.apache.cassandra.io.sstable.format.SSTableWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.config.Schema;
import org.apache.cassandra.db.ColumnFamilyStore;
import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.io.compress.CompressionMetadata;
import org.apache.cassandra.streaming.ProgressInfo;
import org.apache.cassandra.streaming.StreamReader;
import org.apache.cassandra.streaming.StreamSession;
import org.apache.cassandra.streaming.messages.FileMessageHeader;
import org.apache.cassandra.utils.BytesReadTracker;
import org.apache.cassandra.utils.Pair;
/**
* StreamReader that reads from streamed compressed SSTable
*/
public class CompressedStreamReader extends StreamReader
{
private static final Logger logger = LoggerFactory.getLogger(CompressedStreamReader.class);
protected final CompressionInfo compressionInfo;
public CompressedStreamReader(FileMessageHeader header, StreamSession session)
{
super(header, session);
this.compressionInfo = header.compressionInfo;
}
/**
* @return SSTable transferred
* @throws java.io.IOException if reading the remote sstable fails. Will throw an RTE if local write fails.
*/
@Override
public SSTableWriter read(ReadableByteChannel channel) throws IOException
{
logger.debug("reading file from {}, repairedAt = {}", session.peer, repairedAt);
long totalSize = totalSize();
Pair<String, String> kscf = Schema.instance.getCF(cfId);
if (kscf == null)
{
// schema was dropped during streaming
throw new IOException("CF " + cfId + " was dropped during streaming");
}
ColumnFamilyStore cfs = Keyspace.open(kscf.left).getColumnFamilyStore(kscf.right);
SSTableWriter writer = createWriter(cfs, totalSize, repairedAt, format);
CompressedInputStream cis = new CompressedInputStream(Channels.newInputStream(channel), compressionInfo, inputVersion.hasPostCompressionAdlerChecksums());
BytesReadTracker in = new BytesReadTracker(new DataInputStream(cis));
try
{
for (Pair<Long, Long> section : sections)
{
assert in.getBytesRead() < totalSize;
int sectionLength = (int) (section.right - section.left);
// skip to beginning of section inside chunk
cis.position(section.left);
in.reset(0);
while (in.getBytesRead() < sectionLength)
{
writeRow(writer, in, cfs);
// when compressed, report total bytes of compressed chunks read since remoteFile.size is the sum of chunks transferred
session.progress(desc, ProgressInfo.Direction.IN, cis.getTotalCompressedBytesRead(), totalSize);
}
}
return writer;
}
catch (Throwable e)
{
writer.abort();
drain(cis, in.getBytesRead());
if (e instanceof IOException)
throw (IOException) e;
else
throw Throwables.propagate(e);
}
}
@Override
protected long totalSize()
{
long size = 0;
// calculate total length of transferring chunks
for (CompressionMetadata.Chunk chunk : compressionInfo.chunks)
size += chunk.length + 4; // 4 bytes for CRC
return size;
}
}