hadoop RSErasureDecoder 源码
haddop RSErasureDecoder 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/coder/RSErasureDecoder.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.RawErasureDecoder;
/**
* Reed-Solomon erasure decoder that decodes a block group.
*
* It implements {@link ErasureCoder}.
*/
@InterfaceAudience.Private
public class RSErasureDecoder extends ErasureDecoder {
private RawErasureDecoder rsRawDecoder;
public RSErasureDecoder(ErasureCoderOptions options) {
super(options);
}
@Override
protected ErasureCodingStep prepareDecodingStep(final ECBlockGroup blockGroup) {
ECBlock[] inputBlocks = getInputBlocks(blockGroup);
ECBlock[] outputBlocks = getOutputBlocks(blockGroup);
RawErasureDecoder rawDecoder = checkCreateRSRawDecoder();
return new ErasureDecodingStep(inputBlocks,
getErasedIndexes(inputBlocks), outputBlocks, rawDecoder);
}
private RawErasureDecoder checkCreateRSRawDecoder() {
if (rsRawDecoder == null) {
rsRawDecoder = CodecUtil.createRawDecoder(getConf(),
ErasureCodeConstants.RS_CODEC_NAME, getOptions());
}
return rsRawDecoder;
}
@Override
public void release() {
if (rsRawDecoder != null) {
rsRawDecoder.release();
}
}
}
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