hadoop ErasureDecodingStep 源码
haddop ErasureDecodingStep 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/coder/ErasureDecodingStep.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.ECBlock;
import org.apache.hadoop.io.erasurecode.ECChunk;
import org.apache.hadoop.io.erasurecode.rawcoder.RawErasureDecoder;
import java.io.IOException;
/**
* Erasure decoding step, a wrapper of all the necessary information to perform
* a decoding step involved in the whole process of decoding a block group.
*/
@InterfaceAudience.Private
public class ErasureDecodingStep implements ErasureCodingStep {
private ECBlock[] inputBlocks;
private ECBlock[] outputBlocks;
private int[] erasedIndexes;
private RawErasureDecoder rawDecoder;
/**
* The constructor with all the necessary info.
* @param inputBlocks inputBlocks.
* @param erasedIndexes the indexes of erased blocks in inputBlocks array
* @param outputBlocks outputBlocks.
* @param rawDecoder rawDecoder.
*/
public ErasureDecodingStep(ECBlock[] inputBlocks, int[] erasedIndexes,
ECBlock[] outputBlocks,
RawErasureDecoder rawDecoder) {
this.inputBlocks = inputBlocks;
this.outputBlocks = outputBlocks;
this.erasedIndexes = erasedIndexes;
this.rawDecoder = rawDecoder;
}
@Override
public void performCoding(ECChunk[] inputChunks, ECChunk[] outputChunks)
throws IOException {
rawDecoder.decode(inputChunks, erasedIndexes, outputChunks);
}
@Override
public ECBlock[] getInputBlocks() {
return inputBlocks;
}
@Override
public ECBlock[] getOutputBlocks() {
return outputBlocks;
}
@Override
public void finish() {
// TODO: Finalize decoder if necessary
}
}
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