hadoop ChunkChecksum 源码
haddop ChunkChecksum 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/ChunkChecksum.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.hdfs.server.datanode;
/**
* holder class that holds checksum bytes and the length in a block at which
* the checksum bytes end
*
* ex: length = 1023 and checksum is 4 bytes which is for 512 bytes, then
* the checksum applies for the last chunk, or bytes 512 - 1023
*/
public class ChunkChecksum {
private final long dataLength;
// can be null if not available
private final byte[] checksum;
public ChunkChecksum(long dataLength, byte[] checksum) {
this.dataLength = dataLength;
this.checksum = checksum;
}
public long getDataLength() {
return dataLength;
}
public byte[] getChecksum() {
return checksum;
}
}
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