hadoop RSErasureEncoder 源码
haddop RSErasureEncoder 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/coder/RSErasureEncoder.java
/**
* 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.coder;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.io.erasurecode.CodecUtil;
import org.apache.hadoop.io.erasurecode.ECBlock;
import org.apache.hadoop.io.erasurecode.ECBlockGroup;
import org.apache.hadoop.io.erasurecode.ErasureCodeConstants;
import org.apache.hadoop.io.erasurecode.ErasureCoderOptions;
import org.apache.hadoop.io.erasurecode.rawcoder.RawErasureEncoder;
/**
* Reed-Solomon erasure encoder that encodes a block group.
*
* It implements {@link ErasureCoder}.
*/
@InterfaceAudience.Private
public class RSErasureEncoder extends ErasureEncoder {
private RawErasureEncoder rawEncoder;
public RSErasureEncoder(ErasureCoderOptions options) {
super(options);
}
@Override
protected ErasureCodingStep prepareEncodingStep(final ECBlockGroup blockGroup) {
RawErasureEncoder rawEncoder = checkCreateRSRawEncoder();
ECBlock[] inputBlocks = getInputBlocks(blockGroup);
return new ErasureEncodingStep(inputBlocks,
getOutputBlocks(blockGroup), rawEncoder);
}
private RawErasureEncoder checkCreateRSRawEncoder() {
if (rawEncoder == null) {
// TODO: we should create the raw coder according to codec.
rawEncoder = CodecUtil.createRawEncoder(getConf(),
ErasureCodeConstants.RS_CODEC_NAME, getOptions());
}
return rawEncoder;
}
@Override
public void release() {
if (rawEncoder != null) {
rawEncoder.release();
}
}
@Override
public boolean preferDirectBuffer() {
return false;
}
}
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