hadoop ECBlock 源码
haddop ECBlock 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/ECBlock.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;
import org.apache.hadoop.classification.InterfaceAudience;
/**
* A wrapper of block level data source/output that {@link ECChunk}s can be
* extracted from. For HDFS, it can be an HDFS block (250MB). Note it only cares
* about erasure coding specific logic thus avoids coupling with any HDFS block
* details. We can have something like HdfsBlock extend it.
*/
@InterfaceAudience.Private
public class ECBlock {
private boolean isParity;
private boolean isErased;
/**
* A default constructor. isParity and isErased are false by default.
*/
public ECBlock() {
this(false, false);
}
/**
* A constructor specifying isParity and isErased.
* @param isParity is a parity block
* @param isErased is erased or not
*/
public ECBlock(boolean isParity, boolean isErased) {
this.isParity = isParity;
this.isErased = isErased;
}
/**
* Set true if it's for a parity block.
* @param isParity is parity or not
*/
public void setParity(boolean isParity) {
this.isParity = isParity;
}
/**
* Set true if the block is missing.
* @param isErased is erased or not
*/
public void setErased(boolean isErased) {
this.isErased = isErased;
}
/**
*
* @return true if it's parity block, otherwise false
*/
public boolean isParity() {
return isParity;
}
/**
*
* @return true if it's erased due to erasure, otherwise false
*/
public boolean isErased() {
return isErased;
}
}
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