hadoop IKVSerializer 源码
haddop IKVSerializer 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask/src/main/java/org/apache/hadoop/mapred/nativetask/serde/IKVSerializer.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.mapred.nativetask.serde;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.mapred.nativetask.buffer.DataInputStream;
import org.apache.hadoop.mapred.nativetask.buffer.DataOutputStream;
import org.apache.hadoop.mapred.nativetask.util.SizedWritable;
/**
* serializes key-value pair
*/
@InterfaceAudience.Private
public interface IKVSerializer {
/**
* update the length field of SizedWritable
*/
public void updateLength(SizedWritable<?> key, SizedWritable<?> value) throws IOException;
public int serializeKV(DataOutputStream out, SizedWritable<?> key,
SizedWritable<?> value) throws IOException;
public int serializePartitionKV(DataOutputStream out, int partitionId,
SizedWritable<?> key, SizedWritable<?> value)
throws IOException;
public int deserializeKV(DataInputStream in, SizedWritable<?> key, SizedWritable<?> value)
throws IOException;
}
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