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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.parquet.hadoop;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.compress.CodecPool;
import org.apache.hadoop.io.compress.CompressionCodec;
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.util.ReflectionUtils;
import org.apache.parquet.bytes.ByteBufferAllocator;
import org.apache.parquet.bytes.BytesInput;
import org.apache.parquet.compression.CompressionCodecFactory;
import org.apache.parquet.hadoop.metadata.CompressionCodecName;
public class CodecFactory implements CompressionCodecFactory {
protected static final Map CODEC_BY_NAME = Collections
.synchronizedMap(new HashMap());
private final Map compressors = new HashMap();
private final Map decompressors = new HashMap();
protected final Configuration configuration;
protected final int pageSize;
/**
* Create a new codec factory.
*
* @param configuration used to pass compression codec configuration information
* @param pageSize the expected page size, does not set a hard limit, currently just
* used to set the initial size of the output stream used when
* compressing a buffer. If this factory is only used to construct
* decompressors this parameter has no impact on the function of the factory
*/
public CodecFactory(Configuration configuration, int pageSize) {
this.configuration = configuration;
this.pageSize = pageSize;
}
/**
* Create a codec factory that will provide compressors and decompressors
* that will work natively with ByteBuffers backed by direct memory.
*
* @param config configuration options for different compression codecs
* @param allocator an allocator for creating result buffers during compression
* and decompression, must provide buffers backed by Direct
* memory and return true for the isDirect() method
* on the ByteBufferAllocator interface
* @param pageSize the default page size. This does not set a hard limit on the
* size of buffers that can be compressed, but performance may
* be improved by setting it close to the expected size of buffers
* (in the case of parquet, pages) that will be compressed. This
* setting is unused in the case of decompressing data, as parquet
* always records the uncompressed size of a buffer. If this
* CodecFactory is only going to be used for decompressors, this
* parameter will not impact the function of the factory.
* @return a configured direct codec factory
*/
public static CodecFactory createDirectCodecFactory(Configuration config, ByteBufferAllocator allocator, int pageSize) {
return new DirectCodecFactory(config, allocator, pageSize);
}
class HeapBytesDecompressor extends BytesDecompressor {
private final CompressionCodec codec;
private final Decompressor decompressor;
HeapBytesDecompressor(CompressionCodecName codecName) {
this.codec = getCodec(codecName);
if (codec != null) {
decompressor = CodecPool.getDecompressor(codec);
} else {
decompressor = null;
}
}
@Override
public BytesInput decompress(BytesInput bytes, int uncompressedSize) throws IOException {
final BytesInput decompressed;
if (codec != null) {
if (decompressor != null) {
decompressor.reset();
}
InputStream is = codec.createInputStream(bytes.toInputStream(), decompressor);
decompressed = BytesInput.from(is, uncompressedSize);
} else {
decompressed = bytes;
}
return decompressed;
}
@Override
public void decompress(ByteBuffer input, int compressedSize, ByteBuffer output, int uncompressedSize) throws IOException {
ByteBuffer decompressed = decompress(BytesInput.from(input), uncompressedSize).toByteBuffer();
output.put(decompressed);
}
public void release() {
if (decompressor != null) {
CodecPool.returnDecompressor(decompressor);
}
}
}
/**
* Encapsulates the logic around hadoop compression
*/
class HeapBytesCompressor extends BytesCompressor {
private final CompressionCodec codec;
private final Compressor compressor;
private final ByteArrayOutputStream compressedOutBuffer;
private final CompressionCodecName codecName;
HeapBytesCompressor(CompressionCodecName codecName) {
this.codecName = codecName;
this.codec = getCodec(codecName);
if (codec != null) {
this.compressor = CodecPool.getCompressor(codec);
this.compressedOutBuffer = new ByteArrayOutputStream(pageSize);
} else {
this.compressor = null;
this.compressedOutBuffer = null;
}
}
@Override
public BytesInput compress(BytesInput bytes) throws IOException {
final BytesInput compressedBytes;
if (codec == null) {
compressedBytes = bytes;
} else {
compressedOutBuffer.reset();
if (compressor != null) {
// null compressor for non-native gzip
compressor.reset();
}
CompressionOutputStream cos = codec.createOutputStream(compressedOutBuffer, compressor);
bytes.writeAllTo(cos);
cos.finish();
cos.close();
compressedBytes = BytesInput.from(compressedOutBuffer);
}
return compressedBytes;
}
@Override
public void release() {
if (compressor != null) {
CodecPool.returnCompressor(compressor);
}
}
public CompressionCodecName getCodecName() {
return codecName;
}
}
@Override
public BytesCompressor getCompressor(CompressionCodecName codecName) {
BytesCompressor comp = compressors.get(codecName);
if (comp == null) {
comp = createCompressor(codecName);
compressors.put(codecName, comp);
}
return comp;
}
@Override
public BytesDecompressor getDecompressor(CompressionCodecName codecName) {
BytesDecompressor decomp = decompressors.get(codecName);
if (decomp == null) {
decomp = createDecompressor(codecName);
decompressors.put(codecName, decomp);
}
return decomp;
}
protected BytesCompressor createCompressor(CompressionCodecName codecName) {
return new HeapBytesCompressor(codecName);
}
protected BytesDecompressor createDecompressor(CompressionCodecName codecName) {
return new HeapBytesDecompressor(codecName);
}
/**
*
* @param codecName
* the requested codec
* @return the corresponding hadoop codec. null if UNCOMPRESSED
*/
protected CompressionCodec getCodec(CompressionCodecName codecName) {
String codecClassName = codecName.getHadoopCompressionCodecClassName();
if (codecClassName == null) {
return null;
}
CompressionCodec codec = CODEC_BY_NAME.get(codecClassName);
if (codec != null) {
return codec;
}
try {
Class codecClass;
try {
codecClass = Class.forName(codecClassName);
} catch (ClassNotFoundException e) {
// Try to load the class using the job classloader
codecClass = configuration.getClassLoader().loadClass(codecClassName);
}
codec = (CompressionCodec) ReflectionUtils.newInstance(codecClass, configuration);
CODEC_BY_NAME.put(codecClassName, codec);
return codec;
} catch (ClassNotFoundException e) {
throw new BadConfigurationException("Class " + codecClassName + " was not found", e);
}
}
@Override
public void release() {
for (BytesCompressor compressor : compressors.values()) {
compressor.release();
}
compressors.clear();
for (BytesDecompressor decompressor : decompressors.values()) {
decompressor.release();
}
decompressors.clear();
}
/**
* @deprecated will be removed in 2.0.0; use CompressionCodecFactory.BytesInputCompressor instead.
*/
@Deprecated
public static abstract class BytesCompressor implements CompressionCodecFactory.BytesInputCompressor {
public abstract BytesInput compress(BytesInput bytes) throws IOException;
public abstract CompressionCodecName getCodecName();
public abstract void release();
}
/**
* @deprecated will be removed in 2.0.0; use CompressionCodecFactory.BytesInputDecompressor instead.
*/
@Deprecated
public static abstract class BytesDecompressor implements CompressionCodecFactory.BytesInputDecompressor {
public abstract BytesInput decompress(BytesInput bytes, int uncompressedSize) throws IOException;
public abstract void decompress(ByteBuffer input, int compressedSize, ByteBuffer output, int uncompressedSize) throws IOException;
public abstract void release();
}
}
