hadoop ErasureCodingStep 源码
haddop ErasureCodingStep 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/coder/ErasureCodingStep.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 java.io.IOException;
/**
* Erasure coding step that's involved in encoding/decoding of a block group.
*/
@InterfaceAudience.Private
public interface ErasureCodingStep {
/**
* Input blocks of readable data involved in this step, may be data blocks
* or parity blocks.
* @return input blocks
*/
ECBlock[] getInputBlocks();
/**
* Output blocks of writable buffers involved in this step, may be data
* blocks or parity blocks.
* @return output blocks
*/
ECBlock[] getOutputBlocks();
/**
* Perform encoding or decoding given the input chunks, and generated results
* will be written to the output chunks.
* @param inputChunks inputChunks.
* @param outputChunks outputChunks.
* @throws IOException raised on errors performing I/O.
*/
void performCoding(ECChunk[] inputChunks, ECChunk[] outputChunks)
throws IOException;
/**
* Notify erasure coder that all the chunks of input blocks are processed so
* the coder can be able to update internal states, considering next step.
*/
void finish();
}
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