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/*
* 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.hadoop.hbase.io.compress;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.io.compress.CodecPool;
import org.apache.hadoop.io.compress.CompressionCodec;
import org.apache.hadoop.io.compress.CompressionInputStream;
import org.apache.hadoop.io.compress.CompressionOutputStream;
import org.apache.hadoop.io.compress.Compressor;
import org.apache.hadoop.io.compress.Decompressor;
import org.apache.hadoop.io.compress.DoNotPool;
import org.apache.hadoop.util.ReflectionUtils;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Compression related stuff. Copied from hadoop-3315 tfile.
*/
@InterfaceAudience.Private
public final class Compression {
private static final Logger LOG = LoggerFactory.getLogger(Compression.class);
// LZO
public static final String LZO_CODEC_CLASS_KEY = "hbase.io.compress.lzo.codec";
public static final String LZO_CODEC_CLASS_DEFAULT = "com.hadoop.compression.lzo.LzoCodec";
// GZ
public static final String GZ_CODEC_CLASS_KEY = "hbase.io.compress.gz.codec";
// Our ReusableStreamGzipCodec fixes an inefficiency in Hadoop's Gzip codec, allowing us to
// reuse compression streams, but still requires the Hadoop native codec.
public static final String GZ_CODEC_CLASS_DEFAULT =
"org.apache.hadoop.hbase.io.compress.ReusableStreamGzipCodec";
// SNAPPY
public static final String SNAPPY_CODEC_CLASS_KEY = "hbase.io.compress.snappy.codec";
public static final String SNAPPY_CODEC_CLASS_DEFAULT =
"org.apache.hadoop.io.compress.SnappyCodec";
// LZ4
public static final String LZ4_CODEC_CLASS_KEY = "hbase.io.compress.lz4.codec";
public static final String LZ4_CODEC_CLASS_DEFAULT = "org.apache.hadoop.io.compress.Lz4Codec";
// ZSTD
public static final String ZSTD_CODEC_CLASS_KEY = "hbase.io.compress.zstd.codec";
public static final String ZSTD_CODEC_CLASS_DEFAULT =
"org.apache.hadoop.io.compress.ZStandardCodec";
// BZIP2
public static final String BZIP2_CODEC_CLASS_KEY = "hbase.io.compress.bzip2.codec";
public static final String BZIP2_CODEC_CLASS_DEFAULT = "org.apache.hadoop.io.compress.BZip2Codec";
// LZMA
public static final String LZMA_CODEC_CLASS_KEY = "hbase.io.compress.lzma.codec";
public static final String LZMA_CODEC_CLASS_DEFAULT =
"org.apache.hadoop.hbase.io.compress.xz.LzmaCodec";
// Brotli
public static final String BROTLI_CODEC_CLASS_KEY = "hbase.io.compress.brotli.codec";
public static final String BROTLI_CODEC_CLASS_DEFAULT =
"org.apache.hadoop.hbase.io.compress.brotli.BrotliCodec";
/**
* Prevent the instantiation of class.
*/
private Compression() {
super();
}
static class FinishOnFlushCompressionStream extends FilterOutputStream {
public FinishOnFlushCompressionStream(CompressionOutputStream cout) {
super(cout);
}
@Override
public void write(byte b[], int off, int len) throws IOException {
out.write(b, off, len);
}
@Override
public void flush() throws IOException {
CompressionOutputStream cout = (CompressionOutputStream) out;
cout.finish();
cout.flush();
cout.resetState();
}
}
/**
* Returns the classloader to load the Codec class from.
*/
private static ClassLoader getClassLoaderForCodec() {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
if (cl == null) {
cl = Compression.class.getClassLoader();
}
if (cl == null) {
cl = ClassLoader.getSystemClassLoader();
}
if (cl == null) {
throw new RuntimeException("A ClassLoader to load the Codec could not be determined");
}
return cl;
}
/**
* Compression algorithms. The ordinal of these cannot change or else you risk breaking all
* existing HFiles out there. Even the ones that are not compressed! (They use the NONE algorithm)
*/
@edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "SE_TRANSIENT_FIELD_NOT_RESTORED",
justification = "We are not serializing so doesn't apply (not sure why transient though)")
@SuppressWarnings("ImmutableEnumChecker")
@InterfaceAudience.Public
public static enum Algorithm {
// LZO is GPL and requires extra install to setup. See
// https://stackoverflow.com/questions/23441142/class-com-hadoop-compression-lzo-lzocodec-not-found-for-spark-on-cdh-5
LZO("lzo", LZO_CODEC_CLASS_KEY, LZO_CODEC_CLASS_DEFAULT) {
// Use base type to avoid compile-time dependencies.
private volatile transient CompressionCodec lzoCodec;
private final transient Object lock = new Object();
@Override
CompressionCodec getCodec(Configuration conf) {
if (lzoCodec == null) {
synchronized (lock) {
if (lzoCodec == null) {
lzoCodec = buildCodec(conf, this);
}
}
}
return lzoCodec;
}
@Override
public CompressionCodec reload(Configuration conf) {
synchronized (lock) {
lzoCodec = buildCodec(conf, this);
LOG.warn("Reloaded configuration for {}", name());
return lzoCodec;
}
}
},
GZ("gz", GZ_CODEC_CLASS_KEY, GZ_CODEC_CLASS_DEFAULT) {
private volatile transient CompressionCodec gzCodec;
private final transient Object lock = new Object();
@Override
CompressionCodec getCodec(Configuration conf) {
if (gzCodec == null) {
synchronized (lock) {
if (gzCodec == null) {
gzCodec = buildCodec(conf, this);
}
}
}
return gzCodec;
}
@Override
public CompressionCodec reload(Configuration conf) {
synchronized (lock) {
gzCodec = buildCodec(conf, this);
LOG.warn("Reloaded configuration for {}", name());
return gzCodec;
}
}
},
NONE("none", "", "") {
@Override
CompressionCodec getCodec(Configuration conf) {
return null;
}
@Override
public CompressionCodec reload(Configuration conf) {
return null;
}
@Override
public synchronized InputStream createDecompressionStream(InputStream downStream,
Decompressor decompressor, int downStreamBufferSize) throws IOException {
if (downStreamBufferSize > 0) {
return new BufferedInputStream(downStream, downStreamBufferSize);
}
return downStream;
}
@Override
public synchronized OutputStream createCompressionStream(OutputStream downStream,
Compressor compressor, int downStreamBufferSize) throws IOException {
if (downStreamBufferSize > 0) {
return new BufferedOutputStream(downStream, downStreamBufferSize);
}
return downStream;
}
},
SNAPPY("snappy", SNAPPY_CODEC_CLASS_KEY, SNAPPY_CODEC_CLASS_DEFAULT) {
// Use base type to avoid compile-time dependencies.
private volatile transient CompressionCodec snappyCodec;
private final transient Object lock = new Object();
@Override
CompressionCodec getCodec(Configuration conf) {
if (snappyCodec == null) {
synchronized (lock) {
if (snappyCodec == null) {
snappyCodec = buildCodec(conf, this);
}
}
}
return snappyCodec;
}
@Override
public CompressionCodec reload(Configuration conf) {
synchronized (lock) {
snappyCodec = buildCodec(conf, this);
LOG.warn("Reloaded configuration for {}", name());
return snappyCodec;
}
}
},
LZ4("lz4", LZ4_CODEC_CLASS_KEY, LZ4_CODEC_CLASS_DEFAULT) {
// Use base type to avoid compile-time dependencies.
private volatile transient CompressionCodec lz4Codec;
private final transient Object lock = new Object();
@Override
CompressionCodec getCodec(Configuration conf) {
if (lz4Codec == null) {
synchronized (lock) {
if (lz4Codec == null) {
lz4Codec = buildCodec(conf, this);
}
}
}
return lz4Codec;
}
@Override
public CompressionCodec reload(Configuration conf) {
synchronized (lock) {
lz4Codec = buildCodec(conf, this);
LOG.warn("Reloaded configuration for {}", name());
return lz4Codec;
}
}
},
BZIP2("bzip2", BZIP2_CODEC_CLASS_KEY, BZIP2_CODEC_CLASS_DEFAULT) {
// Use base type to avoid compile-time dependencies.
private volatile transient CompressionCodec bzipCodec;
private final transient Object lock = new Object();
@Override
CompressionCodec getCodec(Configuration conf) {
if (bzipCodec == null) {
synchronized (lock) {
if (bzipCodec == null) {
bzipCodec = buildCodec(conf, this);
}
}
}
return bzipCodec;
}
@Override
public CompressionCodec reload(Configuration conf) {
synchronized (lock) {
bzipCodec = buildCodec(conf, this);
LOG.warn("Reloaded configuration for {}", name());
return bzipCodec;
}
}
},
ZSTD("zstd", ZSTD_CODEC_CLASS_KEY, ZSTD_CODEC_CLASS_DEFAULT) {
// Use base type to avoid compile-time dependencies.
private volatile transient CompressionCodec zStandardCodec;
private final transient Object lock = new Object();
@Override
CompressionCodec getCodec(Configuration conf) {
if (zStandardCodec == null) {
synchronized (lock) {
if (zStandardCodec == null) {
zStandardCodec = buildCodec(conf, this);
}
}
}
return zStandardCodec;
}
@Override
public CompressionCodec reload(Configuration conf) {
synchronized (lock) {
zStandardCodec = buildCodec(conf, this);
LOG.warn("Reloaded configuration for {}", name());
return zStandardCodec;
}
}
},
LZMA("lzma", LZMA_CODEC_CLASS_KEY, LZMA_CODEC_CLASS_DEFAULT) {
// Use base type to avoid compile-time dependencies.
private volatile transient CompressionCodec lzmaCodec;
private final transient Object lock = new Object();
@Override
CompressionCodec getCodec(Configuration conf) {
if (lzmaCodec == null) {
synchronized (lock) {
if (lzmaCodec == null) {
lzmaCodec = buildCodec(conf, this);
}
}
}
return lzmaCodec;
}
@Override
public CompressionCodec reload(Configuration conf) {
synchronized (lock) {
lzmaCodec = buildCodec(conf, this);
LOG.warn("Reloaded configuration for {}", name());
return lzmaCodec;
}
}
},
BROTLI("brotli", BROTLI_CODEC_CLASS_KEY, BROTLI_CODEC_CLASS_DEFAULT) {
// Use base type to avoid compile-time dependencies.
private volatile transient CompressionCodec brotliCodec;
private final transient Object lock = new Object();
@Override
CompressionCodec getCodec(Configuration conf) {
if (brotliCodec == null) {
synchronized (lock) {
if (brotliCodec == null) {
brotliCodec = buildCodec(conf, this);
}
}
}
return brotliCodec;
}
@Override
public CompressionCodec reload(Configuration conf) {
synchronized (lock) {
brotliCodec = buildCodec(conf, this);
LOG.warn("Reloaded configuration for {}", name());
return brotliCodec;
}
}
};
private final Configuration conf;
private final String compressName;
private final String confKey;
private final String confDefault;
/** data input buffer size to absorb small reads from application. */
private static final int DATA_IBUF_SIZE = 1 * 1024;
/** data output buffer size to absorb small writes from application. */
private static final int DATA_OBUF_SIZE = 4 * 1024;
Algorithm(String name, String confKey, String confDefault) {
this.conf = HBaseConfiguration.create();
this.conf.setBoolean("io.native.lib.available", true);
this.compressName = name;
this.confKey = confKey;
this.confDefault = confDefault;
}
abstract CompressionCodec getCodec(Configuration conf);
/**
* Reload configuration for the given algorithm.
*
* NOTE: Experts only. This can only be done safely during process startup, before the
* algorithm's codecs are in use. If the codec implementation is changed, the new implementation
* may not be fully compatible with what was loaded at static initialization time, leading to
* potential data corruption. Mostly used by unit tests.
* @param conf configuration
*/
public abstract CompressionCodec reload(Configuration conf);
public InputStream createDecompressionStream(InputStream downStream, Decompressor decompressor,
int downStreamBufferSize) throws IOException {
CompressionCodec codec = getCodec(conf);
// Set the internal buffer size to read from down stream.
if (downStreamBufferSize > 0) {
((Configurable) codec).getConf().setInt("io.file.buffer.size", downStreamBufferSize);
}
CompressionInputStream cis = codec.createInputStream(downStream, decompressor);
BufferedInputStream bis2 = new BufferedInputStream(cis, DATA_IBUF_SIZE);
return bis2;
}
public OutputStream createCompressionStream(OutputStream downStream, Compressor compressor,
int downStreamBufferSize) throws IOException {
OutputStream bos1 = null;
if (downStreamBufferSize > 0) {
bos1 = new BufferedOutputStream(downStream, downStreamBufferSize);
} else {
bos1 = downStream;
}
CompressionOutputStream cos = createPlainCompressionStream(bos1, compressor);
BufferedOutputStream bos2 =
new BufferedOutputStream(new FinishOnFlushCompressionStream(cos), DATA_OBUF_SIZE);
return bos2;
}
/**
* Creates a compression stream without any additional wrapping into buffering streams.
*/
public CompressionOutputStream createPlainCompressionStream(OutputStream downStream,
Compressor compressor) throws IOException {
CompressionCodec codec = getCodec(conf);
((Configurable) codec).getConf().setInt("io.file.buffer.size", 32 * 1024);
return codec.createOutputStream(downStream, compressor);
}
public Compressor getCompressor() {
CompressionCodec codec = getCodec(conf);
if (codec != null) {
Compressor compressor = CodecPool.getCompressor(codec);
if (LOG.isTraceEnabled()) LOG.trace("Retrieved compressor " + compressor + " from pool.");
if (compressor != null) {
if (compressor.finished()) {
// Somebody returns the compressor to CodecPool but is still using it.
LOG.warn("Compressor obtained from CodecPool is already finished()");
}
compressor.reset();
}
return compressor;
}
return null;
}
public void returnCompressor(Compressor compressor) {
if (compressor != null) {
if (LOG.isTraceEnabled()) LOG.trace("Returning compressor " + compressor + " to pool.");
CodecPool.returnCompressor(compressor);
}
}
public Decompressor getDecompressor() {
CompressionCodec codec = getCodec(conf);
if (codec != null) {
Decompressor decompressor = CodecPool.getDecompressor(codec);
if (LOG.isTraceEnabled())
LOG.trace("Retrieved decompressor " + decompressor + " from pool.");
if (decompressor != null) {
if (decompressor.finished()) {
// Somebody returns the decompressor to CodecPool but is still using it.
LOG.warn("Decompressor {} obtained from CodecPool is already finished", decompressor);
}
decompressor.reset();
}
return decompressor;
}
return null;
}
public void returnDecompressor(Decompressor decompressor) {
if (decompressor != null) {
if (LOG.isTraceEnabled()) LOG.trace("Returning decompressor " + decompressor + " to pool.");
CodecPool.returnDecompressor(decompressor);
if (decompressor.getClass().isAnnotationPresent(DoNotPool.class)) {
if (LOG.isTraceEnabled()) LOG.trace("Ending decompressor " + decompressor);
decompressor.end();
}
}
}
public String getName() {
return compressName;
}
}
public static Algorithm getCompressionAlgorithmByName(String compressName) {
Algorithm[] algos = Algorithm.class.getEnumConstants();
for (Algorithm a : algos) {
if (a.getName().equals(compressName)) {
return a;
}
}
throw new IllegalArgumentException("Unsupported compression algorithm name: " + compressName);
}
/**
* Get names of supported compression algorithms.
* @return Array of strings, each represents a supported compression algorithm. Currently, the
* following compression algorithms are supported.
*/
public static String[] getSupportedAlgorithms() {
Algorithm[] algos = Algorithm.class.getEnumConstants();
String[] ret = new String[algos.length];
int i = 0;
for (Algorithm a : algos) {
ret[i++] = a.getName();
}
return ret;
}
/**
* Load a codec implementation for an algorithm using the supplied configuration.
* @param conf the configuration to use
* @param algo the algorithm to implement
*/
private static CompressionCodec buildCodec(final Configuration conf, final Algorithm algo) {
try {
String codecClassName = conf.get(algo.confKey, algo.confDefault);
if (codecClassName == null) {
throw new RuntimeException("No codec configured for " + algo.confKey);
}
Class codecClass = getClassLoaderForCodec().loadClass(codecClassName);
CompressionCodec codec =
(CompressionCodec) ReflectionUtils.newInstance(codecClass, new Configuration(conf));
LOG.info("Loaded codec {} for compression algorithm {}", codec.getClass().getCanonicalName(),
algo.name());
return codec;
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
}
public static void main(String[] args) throws Exception {
Configuration conf = HBaseConfiguration.create();
java.util.Map implMap = new java.util.HashMap<>();
for (Algorithm algo : Algorithm.class.getEnumConstants()) {
try {
implMap.put(algo.name(), algo.getCodec(conf));
} catch (Exception e) {
// Ignore failures to load codec native implementations while building the report.
// We are to report what is configured.
}
}
for (Algorithm algo : Algorithm.class.getEnumConstants()) {
System.out.println(algo.name() + ":");
System.out.println(" name: " + algo.getName());
System.out.println(" confKey: " + algo.confKey);
System.out.println(" confDefault: " + algo.confDefault);
CompressionCodec codec = implMap.get(algo.name());
System.out.println(
" implClass: " + (codec != null ? codec.getClass().getCanonicalName() : ""));
}
}
}