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HADOOP-13019. Implement ErasureCodec for HitchHiker XOR coding. Contributed by Kai Sasaki.

This commit is contained in:
Zhe Zhang 2016-06-23 15:52:51 -07:00
parent dca298d79e
commit 0b9edf6e0f
2 changed files with 85 additions and 0 deletions
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45
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/codec/HHXORErasureCodec.java Normal file
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/**
* 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.codec;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.io.erasurecode.ECSchema;
import org.apache.hadoop.io.erasurecode.coder.ErasureCoder;
import org.apache.hadoop.io.erasurecode.coder.HHXORErasureDecoder;
import org.apache.hadoop.io.erasurecode.coder.HHXORErasureEncoder;
/**
* A Hitchhiker-XOR erasure codec.
*/
@InterfaceAudience.Private
public class HHXORErasureCodec extends AbstractErasureCodec {
public HHXORErasureCodec(ECSchema schema) {
super(schema);
}
@Override
public ErasureCoder createEncoder() {
return new HHXORErasureEncoder(getSchema());
}
@Override
public ErasureCoder createDecoder() {
return new HHXORErasureDecoder(getSchema());
}
}

40
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/erasurecode/codec/TestHHXORErasureCodec.java Normal file
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/**
* 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.codec;
import org.apache.hadoop.io.erasurecode.ECSchema;
import org.apache.hadoop.io.erasurecode.coder.ErasureCoder;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class TestHHXORErasureCodec {
private ECSchema schema = new ECSchema("hhxor", 10, 4);
@Test
public void testGoodCodec() {
HHXORErasureCodec codec = new HHXORErasureCodec(schema);
ErasureCoder encoder = codec.createEncoder();
assertEquals(10, encoder.getNumDataUnits());
assertEquals(4, encoder.getNumParityUnits());
ErasureCoder decoder = codec.createDecoder();
assertEquals(10, decoder.getNumDataUnits());
assertEquals(4, decoder.getNumParityUnits());
}
}