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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.schema;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ThreadLocalRandom;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Objects;
import com.google.common.collect.ImmutableMap;
import org.apache.commons.lang3.builder.HashCodeBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.config.ParameterizedClass;
import org.apache.cassandra.db.TypeSizes;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.io.IVersionedSerializer;
import org.apache.cassandra.io.compress.*;
import org.apache.cassandra.io.util.DataInputPlus;
import org.apache.cassandra.io.util.DataOutputPlus;
import org.apache.cassandra.net.MessagingService;
import static java.lang.String.format;
@SuppressWarnings("deprecation")
public final class CompressionParams
{
private static final Logger logger = LoggerFactory.getLogger(CompressionParams.class);
private static volatile boolean hasLoggedSsTableCompressionWarning;
private static volatile boolean hasLoggedChunkLengthWarning;
private static volatile boolean hasLoggedCrcCheckChanceWarning;
public static final int DEFAULT_CHUNK_LENGTH = 1024 * 16;
public static final double DEFAULT_MIN_COMPRESS_RATIO = 0.0; // Since pre-4.0 versions do not understand the
// new compression parameter we can't use a
// different default value.
public static final IVersionedSerializer serializer = new Serializer();
public static final String CLASS = "class";
public static final String CHUNK_LENGTH_IN_KB = "chunk_length_in_kb";
public static final String ENABLED = "enabled";
public static final String MIN_COMPRESS_RATIO = "min_compress_ratio";
public static final CompressionParams DEFAULT = new CompressionParams(LZ4Compressor.create(Collections.emptyMap()),
DEFAULT_CHUNK_LENGTH,
calcMaxCompressedLength(DEFAULT_CHUNK_LENGTH, DEFAULT_MIN_COMPRESS_RATIO),
DEFAULT_MIN_COMPRESS_RATIO,
Collections.emptyMap());
public static final CompressionParams NOOP = new CompressionParams(NoopCompressor.create(Collections.emptyMap()),
// 4 KiB is often the underlying disk block size
1024 * 4,
Integer.MAX_VALUE,
DEFAULT_MIN_COMPRESS_RATIO,
Collections.emptyMap());
private static final String CRC_CHECK_CHANCE_WARNING = "The option crc_check_chance was deprecated as a compression option. " +
"You should specify it as a top-level table option instead";
@Deprecated public static final String SSTABLE_COMPRESSION = "sstable_compression";
@Deprecated public static final String CHUNK_LENGTH_KB = "chunk_length_kb";
@Deprecated public static final String CRC_CHECK_CHANCE = "crc_check_chance";
private final ICompressor sstableCompressor;
private final int chunkLength;
private final int maxCompressedLength; // In content we store max length to avoid rounding errors causing compress/decompress mismatch.
private final double minCompressRatio; // In configuration we store min ratio, the input parameter.
private final ImmutableMap otherOptions; // Unrecognized options, can be used by the compressor
// TODO: deprecated, should now be carefully removed. Doesn't affect schema code as it isn't included in equals() and hashCode()
private volatile double crcCheckChance = 1.0;
public static CompressionParams fromMap(Map opts)
{
Map options = copyOptions(opts);
String sstableCompressionClass;
if (!opts.isEmpty() && isEnabled(opts) && !containsSstableCompressionClass(opts))
throw new ConfigurationException(format("Missing sub-option '%s' for the 'compression' option.", CLASS));
if (!removeEnabled(options))
{
sstableCompressionClass = null;
if (!options.isEmpty())
throw new ConfigurationException(format("If the '%s' option is set to false no other options must be specified", ENABLED));
}
else
{
sstableCompressionClass = removeSstableCompressionClass(options);
}
int chunkLength = removeChunkLength(options);
double minCompressRatio = removeMinCompressRatio(options);
CompressionParams cp = new CompressionParams(sstableCompressionClass, options, chunkLength, minCompressRatio);
cp.validate();
return cp;
}
public Class klass()
{
return sstableCompressor.getClass();
}
public static CompressionParams noCompression()
{
return new CompressionParams((ICompressor) null, DEFAULT_CHUNK_LENGTH, Integer.MAX_VALUE, 0.0, Collections.emptyMap());
}
// The shorthand methods below are only used for tests. They are a little inconsistent in their choice of
// parameters -- this is done on purpose to test out various compression parameter combinations.
@VisibleForTesting
public static CompressionParams snappy()
{
return snappy(DEFAULT_CHUNK_LENGTH);
}
@VisibleForTesting
public static CompressionParams snappy(int chunkLength)
{
return snappy(chunkLength, 1.1);
}
@VisibleForTesting
public static CompressionParams snappy(int chunkLength, double minCompressRatio)
{
return new CompressionParams(SnappyCompressor.instance, chunkLength, calcMaxCompressedLength(chunkLength, minCompressRatio), minCompressRatio, Collections.emptyMap());
}
@VisibleForTesting
public static CompressionParams deflate()
{
return deflate(DEFAULT_CHUNK_LENGTH);
}
@VisibleForTesting
public static CompressionParams deflate(int chunkLength)
{
return new CompressionParams(DeflateCompressor.instance, chunkLength, Integer.MAX_VALUE, 0.0, Collections.emptyMap());
}
@VisibleForTesting
public static CompressionParams lz4()
{
return lz4(DEFAULT_CHUNK_LENGTH);
}
@VisibleForTesting
public static CompressionParams lz4(int chunkLength)
{
return lz4(chunkLength, chunkLength);
}
@VisibleForTesting
public static CompressionParams lz4(int chunkLength, int maxCompressedLength)
{
return new CompressionParams(LZ4Compressor.create(Collections.emptyMap()), chunkLength, maxCompressedLength, calcMinCompressRatio(chunkLength, maxCompressedLength), Collections.emptyMap());
}
public static CompressionParams zstd()
{
return zstd(DEFAULT_CHUNK_LENGTH);
}
public static CompressionParams zstd(Integer chunkLength)
{
ZstdCompressor compressor = ZstdCompressor.create(Collections.emptyMap());
return new CompressionParams(compressor, chunkLength, Integer.MAX_VALUE, DEFAULT_MIN_COMPRESS_RATIO, Collections.emptyMap());
}
@VisibleForTesting
public static CompressionParams noop()
{
NoopCompressor compressor = NoopCompressor.create(Collections.emptyMap());
return new CompressionParams(compressor, DEFAULT_CHUNK_LENGTH, Integer.MAX_VALUE, DEFAULT_MIN_COMPRESS_RATIO, Collections.emptyMap());
}
public CompressionParams(String sstableCompressorClass, Map otherOptions, int chunkLength, double minCompressRatio) throws ConfigurationException
{
this(createCompressor(parseCompressorClass(sstableCompressorClass), otherOptions), chunkLength, calcMaxCompressedLength(chunkLength, minCompressRatio), minCompressRatio, otherOptions);
}
static int calcMaxCompressedLength(int chunkLength, double minCompressRatio)
{
return (int) Math.ceil(Math.min(chunkLength / minCompressRatio, Integer.MAX_VALUE));
}
public CompressionParams(String sstableCompressorClass, int chunkLength, int maxCompressedLength, Map otherOptions) throws ConfigurationException
{
this(createCompressor(parseCompressorClass(sstableCompressorClass), otherOptions), chunkLength, maxCompressedLength, calcMinCompressRatio(chunkLength, maxCompressedLength), otherOptions);
}
static double calcMinCompressRatio(int chunkLength, int maxCompressedLength)
{
if (maxCompressedLength == Integer.MAX_VALUE)
return 0;
return chunkLength * 1.0 / maxCompressedLength;
}
private CompressionParams(ICompressor sstableCompressor, int chunkLength, int maxCompressedLength, double minCompressRatio, Map otherOptions) throws ConfigurationException
{
this.sstableCompressor = sstableCompressor;
this.chunkLength = chunkLength;
this.otherOptions = ImmutableMap.copyOf(otherOptions);
this.minCompressRatio = minCompressRatio;
this.maxCompressedLength = maxCompressedLength;
}
public CompressionParams copy()
{
return new CompressionParams(sstableCompressor, chunkLength, maxCompressedLength, minCompressRatio, otherOptions);
}
/**
* Checks if compression is enabled.
* @return {@code true} if compression is enabled, {@code false} otherwise.
*/
public boolean isEnabled()
{
return sstableCompressor != null;
}
/**
* Returns the SSTable compressor.
* @return the SSTable compressor or {@code null} if compression is disabled.
*/
public ICompressor getSstableCompressor()
{
return sstableCompressor;
}
public ImmutableMap getOtherOptions()
{
return otherOptions;
}
public int chunkLength()
{
return chunkLength;
}
public int maxCompressedLength()
{
return maxCompressedLength;
}
private static Class parseCompressorClass(String className) throws ConfigurationException
{
if (className == null || className.isEmpty())
return null;
className = className.contains(".") ? className : "org.apache.cassandra.io.compress." + className;
try
{
return Class.forName(className);
}
catch (Exception e)
{
throw new ConfigurationException("Could not create Compression for type " + className, e);
}
}
private static ICompressor createCompressor(Class compressorClass, Map compressionOptions) throws ConfigurationException
{
if (compressorClass == null)
{
if (!compressionOptions.isEmpty())
throw new ConfigurationException("Unknown compression options (" + compressionOptions.keySet() + ") since no compression class found");
return null;
}
if (compressionOptions.containsKey(CRC_CHECK_CHANCE))
{
if (!hasLoggedCrcCheckChanceWarning)
{
logger.warn(CRC_CHECK_CHANCE_WARNING);
hasLoggedCrcCheckChanceWarning = true;
}
compressionOptions.remove(CRC_CHECK_CHANCE);
}
try
{
Method method = compressorClass.getMethod("create", Map.class);
ICompressor compressor = (ICompressor)method.invoke(null, compressionOptions);
// Check for unknown options
for (String provided : compressionOptions.keySet())
if (!compressor.supportedOptions().contains(provided))
throw new ConfigurationException("Unknown compression options " + provided);
return compressor;
}
catch (NoSuchMethodException e)
{
throw new ConfigurationException("create method not found", e);
}
catch (SecurityException e)
{
throw new ConfigurationException("Access forbiden", e);
}
catch (IllegalAccessException e)
{
throw new ConfigurationException("Cannot access method create in " + compressorClass.getName(), e);
}
catch (InvocationTargetException e)
{
if (e.getTargetException() instanceof ConfigurationException)
throw (ConfigurationException) e.getTargetException();
Throwable cause = e.getCause() == null
? e
: e.getCause();
throw new ConfigurationException(format("%s.create() threw an error: %s %s",
compressorClass.getSimpleName(),
cause.getClass().getName(),
cause.getMessage()),
e);
}
catch (ExceptionInInitializerError e)
{
throw new ConfigurationException("Cannot initialize class " + compressorClass.getName());
}
}
public static ICompressor createCompressor(ParameterizedClass compression) throws ConfigurationException
{
return createCompressor(parseCompressorClass(compression.class_name), copyOptions(compression.parameters));
}
private static Map copyOptions(Map co)
{
if (co == null || co.isEmpty())
return Collections.emptyMap();
Map compressionOptions = new HashMap<>();
for (Map.Entry entry : co.entrySet())
compressionOptions.put(entry.getKey().toString(), entry.getValue().toString());
return compressionOptions;
}
/**
* Parse the chunk length (in KB) and returns it as bytes.
*
* @param chLengthKB the length of the chunk to parse
* @return the chunk length in bytes
* @throws ConfigurationException if the chunk size is too large
*/
private static Integer parseChunkLength(String chLengthKB) throws ConfigurationException
{
if (chLengthKB == null)
return null;
try
{
int parsed = Integer.parseInt(chLengthKB);
if (parsed > Integer.MAX_VALUE / 1024)
throw new ConfigurationException(format("Value of %s is too large (%s)", CHUNK_LENGTH_IN_KB,parsed));
return 1024 * parsed;
}
catch (NumberFormatException e)
{
throw new ConfigurationException("Invalid value for " + CHUNK_LENGTH_IN_KB, e);
}
}
/**
* Removes the chunk length option from the specified set of option.
*
* @param options the options
* @return the chunk length value
*/
private static int removeChunkLength(Map options)
{
if (options.containsKey(CHUNK_LENGTH_IN_KB))
{
if (options.containsKey(CHUNK_LENGTH_KB))
{
throw new ConfigurationException(format("The '%s' option must not be used if the chunk length is already specified by the '%s' option",
CHUNK_LENGTH_KB,
CHUNK_LENGTH_IN_KB));
}
return parseChunkLength(options.remove(CHUNK_LENGTH_IN_KB));
}
if (options.containsKey(CHUNK_LENGTH_KB))
{
if (!hasLoggedChunkLengthWarning)
{
hasLoggedChunkLengthWarning = true;
logger.warn("The {} option has been deprecated. You should use {} instead",
CHUNK_LENGTH_KB,
CHUNK_LENGTH_IN_KB);
}
return parseChunkLength(options.remove(CHUNK_LENGTH_KB));
}
return DEFAULT_CHUNK_LENGTH;
}
/**
* Removes the min compress ratio option from the specified set of option.
*
* @param options the options
* @return the min compress ratio, used to calculate max chunk size to write compressed
*/
private static double removeMinCompressRatio(Map options)
{
String ratio = options.remove(MIN_COMPRESS_RATIO);
if (ratio != null)
{
return Double.parseDouble(ratio);
}
return DEFAULT_MIN_COMPRESS_RATIO;
}
/**
* Returns {@code true} if the specified options contains the name of the compression class to be used,
* {@code false} otherwise.
*
* @param options the options
* @return {@code true} if the specified options contains the name of the compression class to be used,
* {@code false} otherwise.
*/
public static boolean containsSstableCompressionClass(Map options)
{
return options.containsKey(CLASS) || options.containsKey(SSTABLE_COMPRESSION);
}
/**
* Removes the option specifying the name of the compression class
*
* @param options the options
* @return the name of the compression class
*/
private static String removeSstableCompressionClass(Map options)
{
if (options.containsKey(CLASS))
{
if (options.containsKey(SSTABLE_COMPRESSION))
throw new ConfigurationException(format("The '%s' option must not be used if the compression algorithm is already specified by the '%s' option",
SSTABLE_COMPRESSION,
CLASS));
String clazz = options.remove(CLASS);
if (clazz.isEmpty())
throw new ConfigurationException(format("The '%s' option must not be empty. To disable compression use 'enabled' : false", CLASS));
return clazz;
}
if (options.containsKey(SSTABLE_COMPRESSION) && !hasLoggedSsTableCompressionWarning)
{
hasLoggedSsTableCompressionWarning = true;
logger.warn("The {} option has been deprecated. You should use {} instead",
SSTABLE_COMPRESSION,
CLASS);
}
return options.remove(SSTABLE_COMPRESSION);
}
/**
* Returns {@code true} if the options contains the {@code enabled} option and that its value is
* {@code true}, otherwise returns {@code false}.
*
* @param options the options
* @return {@code true} if the options contains the {@code enabled} option and that its value is
* {@code true}, otherwise returns {@code false}.
*/
public static boolean isEnabled(Map options)
{
String enabled = options.get(ENABLED);
return enabled == null || Boolean.parseBoolean(enabled);
}
/**
* Removes the {@code enabled} option from the specified options.
*
* @param options the options
* @return the value of the {@code enabled} option
*/
private static boolean removeEnabled(Map options)
{
String enabled = options.remove(ENABLED);
return enabled == null || Boolean.parseBoolean(enabled);
}
// chunkLength must be a power of 2 because we assume so when
// computing the chunk number from an uncompressed file offset (see
// CompressedRandomAccessReader.decompresseChunk())
public void validate() throws ConfigurationException
{
// if chunk length was not set (chunkLength == null), this is fine, default will be used
if (chunkLength <= 0)
throw new ConfigurationException("Invalid negative or null " + CHUNK_LENGTH_IN_KB);
if ((chunkLength & (chunkLength - 1)) != 0)
throw new ConfigurationException(CHUNK_LENGTH_IN_KB + " must be a power of 2");
if (maxCompressedLength < 0)
throw new ConfigurationException("Invalid negative " + MIN_COMPRESS_RATIO);
if (maxCompressedLength > chunkLength && maxCompressedLength < Integer.MAX_VALUE)
throw new ConfigurationException(MIN_COMPRESS_RATIO + " can either be 0 or greater than or equal to 1");
}
public Map asMap()
{
if (!isEnabled())
return Collections.singletonMap(ENABLED, "false");
Map options = new HashMap<>(otherOptions);
options.put(CLASS, sstableCompressor.getClass().getName());
options.put(CHUNK_LENGTH_IN_KB, chunkLengthInKB());
if (minCompressRatio != DEFAULT_MIN_COMPRESS_RATIO)
options.put(MIN_COMPRESS_RATIO, String.valueOf(minCompressRatio));
return options;
}
public String chunkLengthInKB()
{
return String.valueOf(chunkLength() / 1024);
}
public void setCrcCheckChance(double crcCheckChance)
{
this.crcCheckChance = crcCheckChance;
}
public double getCrcCheckChance()
{
return crcCheckChance;
}
public boolean shouldCheckCrc()
{
double checkChance = getCrcCheckChance();
return checkChance >= 1d ||
(checkChance > 0d && checkChance > ThreadLocalRandom.current().nextDouble());
}
@Override
public boolean equals(Object obj)
{
if (obj == this)
return true;
if (!(obj instanceof CompressionParams))
return false;
CompressionParams cp = (CompressionParams) obj;
return Objects.equal(sstableCompressor, cp.sstableCompressor)
&& chunkLength == cp.chunkLength
&& otherOptions.equals(cp.otherOptions)
&& minCompressRatio == cp.minCompressRatio;
}
@Override
public int hashCode()
{
return new HashCodeBuilder(29, 1597)
.append(sstableCompressor)
.append(chunkLength)
.append(otherOptions)
.append(minCompressRatio)
.toHashCode();
}
static class Serializer implements IVersionedSerializer
{
public void serialize(CompressionParams parameters, DataOutputPlus out, int version) throws IOException
{
out.writeUTF(parameters.sstableCompressor.getClass().getSimpleName());
out.writeInt(parameters.otherOptions.size());
for (Map.Entry entry : parameters.otherOptions.entrySet())
{
out.writeUTF(entry.getKey());
out.writeUTF(entry.getValue());
}
out.writeInt(parameters.chunkLength());
if (version >= MessagingService.VERSION_40)
out.writeInt(parameters.maxCompressedLength);
else
if (parameters.maxCompressedLength != Integer.MAX_VALUE)
throw new UnsupportedOperationException("Cannot stream SSTables with uncompressed chunks to pre-4.0 nodes.");
}
public CompressionParams deserialize(DataInputPlus in, int version) throws IOException
{
String compressorName = in.readUTF();
int optionCount = in.readInt();
Map options = new HashMap<>();
for (int i = 0; i < optionCount; ++i)
{
String key = in.readUTF();
String value = in.readUTF();
options.put(key, value);
}
int chunkLength = in.readInt();
int minCompressRatio = Integer.MAX_VALUE; // Earlier Cassandra cannot use uncompressed chunks.
if (version >= MessagingService.VERSION_40)
minCompressRatio = in.readInt();
CompressionParams parameters;
try
{
parameters = new CompressionParams(compressorName, chunkLength, minCompressRatio, options);
}
catch (ConfigurationException e)
{
throw new RuntimeException("Cannot create CompressionParams for parameters", e);
}
return parameters;
}
public long serializedSize(CompressionParams parameters, int version)
{
long size = TypeSizes.sizeof(parameters.sstableCompressor.getClass().getSimpleName());
size += TypeSizes.sizeof(parameters.otherOptions.size());
for (Map.Entry entry : parameters.otherOptions.entrySet())
{
size += TypeSizes.sizeof(entry.getKey());
size += TypeSizes.sizeof(entry.getValue());
}
size += TypeSizes.sizeof(parameters.chunkLength());
if (version >= MessagingService.VERSION_40)
size += TypeSizes.sizeof(parameters.maxCompressedLength());
return size;
}
}
}
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