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Add support for LZ4 compression 

patch by Adrien Grand; reviewed by tjake for CASSANDRA-5038
This commit is contained in:
Jonathan Ellis 2013-02-10 23:58:42 -06:00
parent d0f7e9e14a
commit aa7c7d9cd7
7 changed files with 431 additions and 0 deletions
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1
CHANGES.txt
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@ -16,6 +16,7 @@
* CQL3 refactor to allow conversion function (CASSANDRA-5226)
* Fix drop of sstables in some circumstance (CASSANDRA-5232)
* Implement caching of authorization results (CASSANDRA-4295)
* Add support for LZ4 compression (CASSANDRA-5038)
1.2.1

5
NOTICE.txt
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@ -44,3 +44,8 @@ Written by Nathan G. Bronson et al.
CQL Native transport uses Netty
(https://netty.io/)
Copyright (C) 2011 The Netty Project
LZ4 compression support provided by lz4-java (http://github.com/jpountz/lz4-java)
Written by Adrien Grand.
Contains bindings to the C LZ4 implementation (http://code.google.com/p/lz4/)
Copyright (C) 2011-2012, Yann Collet.

2
build.xml
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@ -329,6 +329,7 @@
<scm connection="${scm.connection}" developerConnection="${scm.developerConnection}" url="${scm.url}"/>
<dependencyManagement>
<dependency groupId="org.xerial.snappy" artifactId="snappy-java" version="1.0.4.1"/>
<dependency groupId="net.jpountz.lz4" artifactId="lz4" version="1.1.0"/>
<dependency groupId="com.ning" artifactId="compress-lzf" version="0.8.4"/>
<dependency groupId="com.google.guava" artifactId="guava" version="12.0"/>
<dependency groupId="commons-cli" artifactId="commons-cli" version="1.1"/>
@ -443,6 +444,7 @@
version="${version}"/>
<scm connection="${scm.connection}" developerConnection="${scm.developerConnection}" url="${scm.url}"/>
<dependency groupId="org.xerial.snappy" artifactId="snappy-java"/>
<dependency groupId="net.jpountz.lz4" artifactId="lz4"/>
<dependency groupId="com.ning" artifactId="compress-lzf"/>
<dependency groupId="com.google.guava" artifactId="guava"/>
<dependency groupId="commons-cli" artifactId="commons-cli"/>

235
lib/licenses/lz4-1.1.0.txt Normal file
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@ -0,0 +1,235 @@
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-------------------------------------------------------------------------------
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You can contact the author at :
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104
src/java/org/apache/cassandra/io/compress/LZ4Compressor.java Normal file
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@ -0,0 +1,104 @@
/*
* 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.io.compress;
import java.io.IOException;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import net.jpountz.lz4.LZ4Exception;
import net.jpountz.lz4.LZ4Factory;
public class LZ4Compressor implements ICompressor
{
private static final int INTEGER_BYTES = 4;
private static final LZ4Compressor instance = new LZ4Compressor();
public static LZ4Compressor create(Map<String, String> args)
{
return instance;
}
private final net.jpountz.lz4.LZ4Compressor compressor;
private final net.jpountz.lz4.LZ4Decompressor decompressor;
private LZ4Compressor()
{
final LZ4Factory lz4Factory = LZ4Factory.fastestInstance();
compressor = lz4Factory.fastCompressor();
decompressor = lz4Factory.decompressor();
}
public int initialCompressedBufferLength(int chunkLength)
{
return INTEGER_BYTES + compressor.maxCompressedLength(chunkLength);
}
public int compress(byte[] input, int inputOffset, int inputLength, WrappedArray output, int outputOffset) throws IOException
{
final byte[] dest = output.buffer;
dest[outputOffset] = (byte) inputLength;
dest[outputOffset + 1] = (byte) (inputLength >>> 8);
dest[outputOffset + 2] = (byte) (inputLength >>> 16);
dest[outputOffset + 3] = (byte) (inputLength >>> 24);
final int maxCompressedLength = compressor.maxCompressedLength(inputLength);
try
{
return INTEGER_BYTES + compressor.compress(input, inputOffset, inputLength,
dest, outputOffset + INTEGER_BYTES, maxCompressedLength);
}
catch (LZ4Exception e)
{
throw new IOException(e);
}
}
public int uncompress(byte[] input, int inputOffset, int inputLength, byte[] output, int outputOffset) throws IOException
{
final int decompressedLength =
(input[inputOffset] & 0xFF)
| ((input[inputOffset + 1] & 0xFF) << 8)
| ((input[inputOffset + 2] & 0xFF) << 16)
| ((input[inputOffset + 3] & 0xFF) << 24);
final int compressedLength;
try
{
compressedLength = decompressor.decompress(input, inputOffset + INTEGER_BYTES,
output, outputOffset, decompressedLength);
}
catch (LZ4Exception e)
{
throw new IOException(e);
}
if (compressedLength != inputLength - INTEGER_BYTES)
{
throw new IOException("Compressed lengths mismatch");
}
return decompressedLength;
}
public Set<String> supportedOptions()
{
return new HashSet<String>(Arrays.asList(CompressionParameters.CRC_CHECK_CHANCE));
}
}

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test/unit/org/apache/cassandra/io/compress/LZ4CompressorTest.java Normal file
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@ -0,0 +1,84 @@
/*
* 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.io.compress;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Arrays;
import java.util.Collections;
import java.util.Random;
import org.apache.cassandra.io.compress.ICompressor.WrappedArray;
import org.junit.Before;
import org.junit.Test;
import static org.junit.Assert.*;
public class LZ4CompressorTest
{
LZ4Compressor compressor;
@Before
public void setUp()
{
compressor = LZ4Compressor.create(Collections.<String, String>emptyMap());
}
public void test(byte[] data, int off, int len) throws IOException
{
final int outOffset = 3;
final WrappedArray out = new WrappedArray(new byte[outOffset + compressor.initialCompressedBufferLength(len)]);
new Random().nextBytes(out.buffer);
final int compressedLength = compressor.compress(data, off, len, out, outOffset);
final int restoredOffset = 5;
final byte[] restored = new byte[restoredOffset + len];
new Random().nextBytes(restored);
final int decompressedLength = compressor.uncompress(out.buffer, outOffset, compressedLength, restored, restoredOffset);
assertEquals(decompressedLength, len);
assertArrayEquals(Arrays.copyOfRange(data, off, off + len),
Arrays.copyOfRange(restored, restoredOffset, restoredOffset + decompressedLength));
}
public void test(byte[] data) throws IOException
{
test(data, 0, data.length);
}
@Test
public void testEmptyArray() throws IOException
{
test(new byte[0]);
}
@Test
public void testShortArray() throws UnsupportedEncodingException, IOException
{
test("Cassandra".getBytes("UTF-8"), 1, 7);
}
@Test
public void testLongArray() throws UnsupportedEncodingException, IOException
{
byte[] data = new byte[1 << 20];
test(data, 13, 1 << 19);
new Random(0).nextBytes(data);
test(data, 13, 1 << 19);
}
}