hadoop DummyErasureDecoder 源码
haddop DummyErasureDecoder 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/coder/DummyErasureDecoder.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.io.erasurecode.ECBlock;
import org.apache.hadoop.io.erasurecode.ECBlockGroup;
import org.apache.hadoop.io.erasurecode.ErasureCoderOptions;
import org.apache.hadoop.io.erasurecode.rawcoder.DummyRawDecoder;
import org.apache.hadoop.io.erasurecode.rawcoder.RawErasureDecoder;
/**
* Dummy erasure decoder does no real computation. Instead, it just returns
* zero bytes. This decoder can be used to isolate the performance issue to
* HDFS side logic instead of codec, and is intended for test only.
*/
public class DummyErasureDecoder extends ErasureDecoder {
public DummyErasureDecoder(ErasureCoderOptions options) {
super(options);
}
@Override
protected ErasureCodingStep prepareDecodingStep(ECBlockGroup blockGroup) {
RawErasureDecoder rawDecoder = new DummyRawDecoder(getOptions());
ECBlock[] inputBlocks = getInputBlocks(blockGroup);
return new ErasureDecodingStep(inputBlocks,
getErasedIndexes(inputBlocks),
getOutputBlocks(blockGroup), rawDecoder);
}
}
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