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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.io.erasurecode;
import org.apache.hadoop.thirdparty.com.google.common.base.Preconditions;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.erasurecode.codec.ErasureCodec;
import org.apache.hadoop.io.erasurecode.codec.HHXORErasureCodec;
import org.apache.hadoop.io.erasurecode.codec.RSErasureCodec;
import org.apache.hadoop.io.erasurecode.codec.XORErasureCodec;
import org.apache.hadoop.io.erasurecode.coder.ErasureDecoder;
import org.apache.hadoop.io.erasurecode.coder.ErasureEncoder;
import org.apache.hadoop.io.erasurecode.rawcoder.RawErasureCoderFactory;
import org.apache.hadoop.io.erasurecode.rawcoder.RawErasureDecoder;
import org.apache.hadoop.io.erasurecode.rawcoder.RawErasureEncoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
/**
* A codec & coder utility to help create coders conveniently.
*
* {@link CodecUtil} includes erasure coder configurations key and default
* values such as coder class name and erasure codec option values included
* by {@link ErasureCodecOptions}. {@link ErasureEncoder} and
* {@link ErasureDecoder} are created by createEncoder and createDecoder
* respectively.{@link RawErasureEncoder} and {@link RawErasureDecoder} are
* are created by createRawEncoder and createRawDecoder.
*/
@InterfaceAudience.Private
public final class CodecUtil {
private static final Logger LOG = LoggerFactory.getLogger(CodecUtil.class);
public static final String IO_ERASURECODE_CODEC = "io.erasurecode.codec.";
/** Erasure coder XOR codec. */
public static final String IO_ERASURECODE_CODEC_XOR_KEY =
IO_ERASURECODE_CODEC + "xor";
public static final String IO_ERASURECODE_CODEC_XOR =
XORErasureCodec.class.getCanonicalName();
/** Erasure coder Reed-Solomon codec. */
public static final String IO_ERASURECODE_CODEC_RS_KEY =
IO_ERASURECODE_CODEC + "rs";
public static final String IO_ERASURECODE_CODEC_RS =
RSErasureCodec.class.getCanonicalName();
/** Erasure coder hitch hiker XOR codec. */
public static final String IO_ERASURECODE_CODEC_HHXOR_KEY =
IO_ERASURECODE_CODEC + "hhxor";
public static final String IO_ERASURECODE_CODEC_HHXOR =
HHXORErasureCodec.class.getCanonicalName();
/** Comma separated raw codec name. The first coder is prior to the latter. */
public static final String IO_ERASURECODE_CODEC_RS_LEGACY_RAWCODERS_KEY =
IO_ERASURECODE_CODEC + "rs-legacy.rawcoders";
public static final String IO_ERASURECODE_CODEC_RS_RAWCODERS_KEY =
IO_ERASURECODE_CODEC + "rs.rawcoders";
/** Raw coder factory for the XOR codec. */
public static final String IO_ERASURECODE_CODEC_XOR_RAWCODERS_KEY =
IO_ERASURECODE_CODEC + "xor.rawcoders";
private CodecUtil() { }
/**
* Create encoder corresponding to given codec.
* @param options Erasure codec options
* @return erasure encoder
*/
public static ErasureEncoder createEncoder(Configuration conf,
ErasureCodecOptions options) {
Preconditions.checkNotNull(conf);
Preconditions.checkNotNull(options);
String codecKey = getCodecClassName(conf,
options.getSchema().getCodecName());
ErasureCodec codec = createCodec(conf, codecKey, options);
return codec.createEncoder();
}
/**
* Create decoder corresponding to given codec.
* @param options Erasure codec options
* @return erasure decoder
*/
public static ErasureDecoder createDecoder(Configuration conf,
ErasureCodecOptions options) {
Preconditions.checkNotNull(conf);
Preconditions.checkNotNull(options);
String codecKey = getCodecClassName(conf,
options.getSchema().getCodecName());
ErasureCodec codec = createCodec(conf, codecKey, options);
return codec.createDecoder();
}
/**
* Create RS raw encoder according to configuration.
* @param conf configuration
* @param coderOptions coder options that's used to create the coder
* @param codec the codec to use. If null, will use the default codec
* @return raw encoder
*/
public static RawErasureEncoder createRawEncoder(
Configuration conf, String codec, ErasureCoderOptions coderOptions) {
Preconditions.checkNotNull(conf);
Preconditions.checkNotNull(codec);
return createRawEncoderWithFallback(conf, codec, coderOptions);
}
/**
* Create RS raw decoder according to configuration.
* @param conf configuration
* @param coderOptions coder options that's used to create the coder
* @param codec the codec to use. If null, will use the default codec
* @return raw decoder
*/
public static RawErasureDecoder createRawDecoder(
Configuration conf, String codec, ErasureCoderOptions coderOptions) {
Preconditions.checkNotNull(conf);
Preconditions.checkNotNull(codec);
return createRawDecoderWithFallback(conf, codec, coderOptions);
}
private static RawErasureCoderFactory createRawCoderFactory(
String coderName, String codecName) {
RawErasureCoderFactory fact;
fact = CodecRegistry.getInstance().
getCoderByName(codecName, coderName);
return fact;
}
public static boolean hasCodec(String codecName) {
return (CodecRegistry.getInstance().getCoderNames(codecName) != null);
}
// Return a list of coder names
private static String[] getRawCoderNames(
Configuration conf, String codecName) {
return conf.getStrings(
IO_ERASURECODE_CODEC + codecName + ".rawcoders",
CodecRegistry.getInstance().getCoderNames(codecName)
);
}
private static RawErasureEncoder createRawEncoderWithFallback(
Configuration conf, String codecName, ErasureCoderOptions coderOptions) {
String[] rawCoderNames = getRawCoderNames(conf, codecName);
for (String rawCoderName : rawCoderNames) {
try {
if (rawCoderName != null) {
RawErasureCoderFactory fact = createRawCoderFactory(
rawCoderName, codecName);
return fact.createEncoder(coderOptions);
}
} catch (LinkageError | Exception e) {
// Fallback to next coder if possible
if (LOG.isDebugEnabled()) {
LOG.debug("Failed to create raw erasure encoder " + rawCoderName +
", fallback to next codec if possible", e);
}
}
}
throw new IllegalArgumentException("Fail to create raw erasure " +
"encoder with given codec: " + codecName);
}
private static RawErasureDecoder createRawDecoderWithFallback(
Configuration conf, String codecName, ErasureCoderOptions coderOptions) {
String[] coders = getRawCoderNames(conf, codecName);
for (String rawCoderName : coders) {
try {
if (rawCoderName != null) {
RawErasureCoderFactory fact = createRawCoderFactory(
rawCoderName, codecName);
return fact.createDecoder(coderOptions);
}
} catch (LinkageError | Exception e) {
// Fallback to next coder if possible
if (LOG.isDebugEnabled()) {
LOG.debug("Failed to create raw erasure decoder " + rawCoderName +
", fallback to next codec if possible", e);
}
}
}
throw new IllegalArgumentException("Fail to create raw erasure " +
"decoder with given codec: " + codecName);
}
private static ErasureCodec createCodec(Configuration conf,
String codecClassName, ErasureCodecOptions options) {
ErasureCodec codec = null;
try {
Class codecClass =
conf.getClassByName(codecClassName)
.asSubclass(ErasureCodec.class);
Constructor constructor
= codecClass.getConstructor(Configuration.class,
ErasureCodecOptions.class);
codec = constructor.newInstance(conf, options);
} catch (ClassNotFoundException | InstantiationException |
IllegalAccessException | NoSuchMethodException |
InvocationTargetException e) {
throw new RuntimeException("Failed to create erasure codec", e);
}
if (codec == null) {
throw new RuntimeException("Failed to create erasure codec");
}
return codec;
}
private static String getCodecClassName(Configuration conf, String codec) {
switch (codec) {
case ErasureCodeConstants.RS_CODEC_NAME:
return conf.get(
CodecUtil.IO_ERASURECODE_CODEC_RS_KEY,
CodecUtil.IO_ERASURECODE_CODEC_RS);
case ErasureCodeConstants.RS_LEGACY_CODEC_NAME:
//TODO:rs-legacy should be handled differently.
return conf.get(
CodecUtil.IO_ERASURECODE_CODEC_RS_KEY,
CodecUtil.IO_ERASURECODE_CODEC_RS);
case ErasureCodeConstants.XOR_CODEC_NAME:
return conf.get(
CodecUtil.IO_ERASURECODE_CODEC_XOR_KEY,
CodecUtil.IO_ERASURECODE_CODEC_XOR);
case ErasureCodeConstants.HHXOR_CODEC_NAME:
return conf.get(
CodecUtil.IO_ERASURECODE_CODEC_HHXOR_KEY,
CodecUtil.IO_ERASURECODE_CODEC_HHXOR);
default:
// For custom codec, we throw exception if the factory is not configured
String codecKey = "io.erasurecode.codec." + codec + ".coder";
String codecClass = conf.get(codecKey);
if (codecClass == null) {
throw new IllegalArgumentException("Codec not configured " +
"for custom codec " + codec);
}
return codecClass;
}
}
}
